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li1550\sb0\sl-230\slmult0\par\pard\li1550\sb0\sl-230\slmult0\par\pard\li1550\sb0\sl-230\slmult0\par\pard\li1550\sb84\sl-230\slmult0\fi9\tx3647\tx4435 \up0 \expndtw0\charscalex136 \ul0\nosupersub\cf8\f9\fs18 COMITE:\tab \up0 \expndtw0\charscalex136 \ul0\nosupersub\cf9\f10\fs20 CT10\tab \up0 \expndtw0\charscalex136 ALIMENTOS\par\pard\li1550\sb0\sl-207\slmult0\par\pard\li1550\sb57\sl-207\slmult0\fi2088 \up0 \expndtw0\charscalex136 \ul0\nosupersub\cf8\f9\fs18 PRESIDENTE: Dr. Gustavo Toro Alayon\par\pard\li1550\sb0\sl-207\slmult0\par\pard\li1550\sb75\sl-207\slmult0\fi2092 \up0 \expndtw0\charscalex136 SECRETARIA: Ing. Milagros Diaz Suarez\par\pard\li1550\sb0\sl-207\slmult0\par\pard\li1550\sb182\sl-207\slmult0\fi0\tx3633\tx5059 \up0 \expndtw0\charscalex136 SUBCOMITE:\tab \up0 \expndtw0\charscalex136 CT10/SC15\tab \up0 \expndtw0\charscalex136 AGUA POTABLE\par\pard\li1550\sb0\sl-207\slmult0\par\pard\li1550\sb70\sl-207\slmult0\fi2078 \up0 \expndtw0\charscalex136 COORDINADORA: Ing. Milagros Diaz Suarez\par\pard\li1468\sb0\sl-230\slmult

0\par\pard\li1468\sb0\sl-230\slmult0\par\pard\li1468\sb0\sl-230\slmult0\par\pard\li1468\sb0\sl-230\slmult0\par\pard\li1468\sb0\sl-230\slmult0\par\pard\li1468\sb74\sl-230\slmult0\fi4080 \up0 \expndtw0\charscalex124 \ul0\nosupersub\cf10\f11\fs20\ul PARTICIPANTES\par\pard\li1468\sb0\sl-207\slmult0\par\pard\li1468\sb177\sl-207\slmult0\fi57\tx8140 \up0 \expndtw0\charscalex124 \ul0\nosupersub\cf7\f8\fs18\ul ENTIDAD\tab \up0 \expndtw0\charscalex124 REPRESENTANTE\par\pard\li1468\sb0\sl-207\slmult0\par\pard\li1468\sb196\sl-207\slmult0\fi57\tx8140 \up0 \expndtw0\charscalex124 \ul0\nosupersub\cf8\f9\fs18 INSTITUTO NACIONAL DE OBRAS\tab \up0 \expndtw0\charscalex124 Ninoska Castillo de Mendoza\par\pard\li1468\sb153\sl-207\slmult0\fi47\tx2966 \up0 \expndtw0\charscalex116 SANITARIAS\tab \up0 \expndtw0\ch

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arscalex124 (INOS)\par\pard\li1468\sb0\sl-230\slmult0\par\pard\li1468\sb33\sl-230\slmult0\fi43\tx8131 \up0 \expndtw0\charscalex124 \ul0\nosupersub\cf9\f10\fs20MINISTERIO DE SANIDAD Y ASISTENCIA\tab \up0 \expndtw0\charscalex124 \ul0\nosupersub\cf8\f9\fs18 Ofelia Herrera\par\pard\li1468\sb130\sl-230\slmult0\fi47\tx2404\tx8131 \up0 \expndtw0\charscalex101 \ul0\nosupersub\cf9\f10\fs20 SOCIAL\tab \up0\expndtw0\charscalex124 - DIVISION DE HIGIENE DE\tab \up0 \expndtw0\charscalex124 Gustavo Toro\par\pard\li1468\sb130\sl-230\slmult0\fi38 \up0 \expndtw0\charscalex124 LOS ALIMENTOS\par\pard\li1468\sb0\sl-230\slmult0\par\pard\li1468\sb30\sl-230\slmult0\fi47\tx8121 \up0 \expndtw0\charscalex124 INSTITUTO NACIONAL DE HIGIENE\tab \up0 \expndtw0\charscalex124 \ul0\nosupersub\cf8\f9\fs18 Maria Victoria Afanador\par\pard\li1468\sb154\sl-207\slmult0\fi6657 \up0 \expndtw0\charscalex124Gladys V. de Anderson\par\pard\li1468\sb153\sl-207\slmult0\fi6647 \up0 \expndtw0\charscalex124 Milagros Polanco\par\pard\li1468\sb0\sl-230\slmult0\par\pard\li1468\sb28\sl-230\slmult0\fi33\tx8112 \up0 \expndtw0\charscalex124 \ul0\nosupersub\cf9\f10\fs20 AGUA MINERAL LOS ALPES\tab \up0 \expndtw0\charscalex124 \ul0\nosupersub\cf8\f9\fs18 Milvia Urbina\par\pard\li1468\sb0\sl-207\slmult0\par\pard\li1468\sb72\sl-207\slmult0\fi28\tx8112 \up0 \expndtw0\charscalex124 AGUA MINERAL ELCASTANO\tab \up0 \expndtw0\charscalex124 Milvia Urbina\par\pard\li1468\sb0\sl-230\slmult0\par\pard\li1468\sb19\sl-230\slmult0\fi23\tx8112 \dn3 \expndtw0\charscalex124 \ul0\nosupersub\cf9\f10\fs20 AGUA MINERAL LA ROCA\tab \up0 \expndtw0\charscalex124 \ul0\nosupersub\cf8\f9\fs18 German Bello\par\pard\li1468\sb0\sl-230\slmult0\par\pard\li1468\sb25\sl-230\slmult0\fi19\tx8102 \up0 \expndtw0\charscalex124 \ul0\nosupersub\cf9\f10\fs20 AGUA MINERAL QUENEPE\tab \up0 \expndtw0\charscalex124 \ul0\nosupersub\cf8\f9\fs18 Luis Betancourt\par\pard\li1468\sb0\sl-230\slm

ult0\par\pard\li1468\sb15\sl-230\slmult0\fi14\tx8097 \up0 \expndtw0\charscalex124 \ul0\nosupersub\cf9\f10\fs20 AGUA MINERAL AMAVENCA\tab \up0 \expndtw0\charscalex124 \ul0\nosupersub\cf8\f9\fs18 Mary Taramona\par\pard\li1468\sb0\sl-207\slmult0\par\pard\li1468\sb58\sl-207\slmult0\fi14\tx8102 \up0 \expndtw0\charscalex124TECNICO INDEPENDIENTE\tab \up0 \expndtw0\charscalex124 Jose Luis Dominguez\par\pard\li1468\sb0\sl-207\slmult0\par\pard\li1468\sb66\sl-207\slmult0\fi0\tx4190\tx5644\tx8097 \up0 \expndtw0\charscalex124 C.A. INDUSTRIAS LARA\tab \up0 \expndtw0\charscalex113 - CARABOBO\tab \up0 \expndtw0\charscalex124 (INLACA)\tab \up0 \expndtw0\charscalex124 Jose Quevedo\par\pard\li1468\sb0\sl-207\slmult0\par\pard\li1468\sb75\sl-207\slmult0\fi9\tx8092 \up0 \expndtw0\charscalex124 EMBOTELLADORA CRYSTAL C.A.\tab \dn2 \expndtw0\charscalex124 Andrelna Castro\par\pard\sect\sectd\fs24\paperw12240\paperh15840{\bkmkstart Pg3}{\bkmkend Pg3}\par\pard\sect\sectd\sbknone\cols2\colno1\colw8273\colsr160\colno2\colw3667\colsr160\ql \li1823\sb0\sl

-207\slmult0 \par\pard\ql \li1823\sb0\sl-207\slmult0 \par\pard\ql \li1823\sb0\sl-207\slmult0 \par\pard\ql \li1823\sb0\sl-207\slmult0 \par\pard\ql \li1862\sb207\sl-207\slmult0 \up0 \expndtw0\charscalex107 \ul0\nosupersub\cf8\f9\fs18 LABROQUIII\par\pard\ql \li1823\sb0\sl-207\slmult0 \par\pard\ql \li1867\sb71\sl-207\slmult0 \up0 \expndtw0\charscalex118 UNIVERSIDAD DE LOS LLANOS\par\pard\ql \li1862\sb157\sl-207\slmult0 \up0 \expndtw0\charscalex110 EZEQUIEL ZAMORA \up0 \expndtw0\charscalex115 (UNELLEZ)\par\pard\ql \li1823\sb0\sl-207\slmult0 \par\pard\ql \li1862\sb71\sl-207\slmult0 \up0 \expndtw0\charscalex114 UNIVERSIDAD CENTRAL DE VENEZUELA\par\pard\ql \li1843\sb158\sl-207\slmult0 \up0 \expndtw0\charscalex125 - FACULTAD DE P1EDICINA \up0 \expndtw0\charscalex133 - ESC. DE NUTRICION\par\pard\ql\li1838\sb153\sl-207\slmult0 \up0 \expndtw0\charscalex120 - FACULTAD DE AGRONOMIA\par\pard\ql \li1823\sb0\sl-207\slmult0 \par\pard\ql \li1848\sb76\sl-207\slmult0 \up0 \expndtw0\charscalex117 FUNDACION CIEPE\par\pard\ql \li1823\sb0\sl-207\sl

mult0 \par\pard\ql \li1843\sb56\sl-207\slmult0 \up0 \expndtw0\charscalex116 UNIVERSIDAD SIMON BOLIVAR\par\pard\ql \li1823\sb0\sl-207\slmult0 \par\pard\ql \li1838\sb71\sl-207\slmult0 \up0 \expndtw0\charscalex114 CAMARA VENEZOLANA DE LA INDUSTRIA\par\pard\ql \li1843\sb134\sl-230\slmult0 \up0 \expndtw0\charscalex104 \ul0\nosupersub\cf9\f10\fs20 DE ALIIIENTOS \up0 \expndtw0\charscalex116 \ul0\nosupersub\cf8\f9\fs18 (CAVIDEA)\par\pard\ql \li1823\sb0\sl-207\slmult0 \par\pard\ql \li1843\sb62\sl-207\slmult0 \up0 \expndtw0\charscalex117 INSTITUTO NACIONAL DENUTRICION\par\pard\ql \li1823\sb0\sl-230\slmult0 \par\pard\ql \li1823\sb0\sl-230\slmult0 \par\pard\ql \li1823\sb159\sl-230\slmult0 \up0 \expndtw0\charscalex111 \ul0\nosupersub\cf9\f10\fs20 MINISTERIO DEL AMBIENTE Y DE LOS\par\pard\ql \li1828\sb1

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53\sl-207\slmult0 \up0 \expndtw0\charscalex111 \ul0\nosupersub\cf8\f9\fs18 RECURSOS NATURALES RENOVABLES\par\pard\ql \li1848\sb153\sl-207\slmult0 \up0 \expndtw0\charscalex120 OFICINA DE NORUAS TECNICAS\par\pard\ql \li1809\sb0\sl-207\slmult0\par\pard\ql \li1809\sb0\sl-207\slmult0 \par\pard\ql \li1809\sb0\sl-207\slmult0\par\pard\ql \li1809\sb0\sl-207\slmult0 \par\pard\ql \li1809\sb0\sl-207\slmult0\par\pard\ql \li1809\sb0\sl-207\slmult0 \par\pard\ql \li1823\sb121\sl-207\slmult0 \up0 \expndtw0\charscalex122 \ul0\nosupersub\cf7\f8\fs18\ul DISCUSION PUBLICA\ul0\nosupersub\cf8\f9\fs18 :\par\pard\ql \li1809\sb0\sl-207\slmult0 \par\pard\ql \li1819\sb66\sl-207\slmult0\tx3935 \up0 \expndtw0\charscalex164 Fecha de envio:\tab \up0 \expndtw0\charscalex150 19-08-83\par\pard\ql \li1823\sb129\sl-230\slmult0\tx3244\tx3633 \up0 \expndtw0\charscalex138 \ul0\nosupersub\cf9\f10\fs20 Duracien:\tab \up0 \expndtw0\charscalex127 \ul0\nosupersub\cf8\f9\fs18 45\tab \up0\expndtw0\charscalex173 dias.\par\pard\ql \li1809\sb0\sl-230\slmult0 \par\pard\ql \li1814\sb155\sl-230\slmult0\tx6518 \up0 \expndtw0\charscalex121 \ul0\nosupersub\cf7\f8\fs18\ul FECHA DE APROBACION POR EL COIIITE\ul0\nosupersub\cf9\f10\fs20:\tab \up0 \expndtw0\charscalex151 \ul0\nosupersub\cf8\f9\fs18 1-03-84\par\pard\ql \li1809\sb0\sl-207\slmult0 \par\pard\ql \li1809\sb62\sl-207\slmult0\tx6609 \up0 \expndtw0\charscalex119 \ul0\nosupersub\cf7\f8\fs18\ul FECHA DE APROBACION POR LA COVENIN\ul0\nosupersub\cf8\f9\fs18 :\tab \up0 \expndtw0\charscalex149 27-06-84\par\pard\column \ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li63\sb202\sl-207\slmult0 \up0 \expndtw0\charscalex154Jose Marquina\par\pard\ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li59\sb17\sl

-207\slmult0 \up0 \expndtw0\charscalex160 Hispano Valladares\par\pard\ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li49\sb17\sl-207\slmult0 \up0 \expndtw0\charscalex155 Lola de Tamsut\par\pard\ql \li54\sb153\sl-207\slmult0 \up0 \expndtw0\charscalex157 Jose' Cegarra\par\pard\ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li49\sb70\sl-207\slmult0 \up0 \expndtw0\charscalex160 Reinaldo Lagonell\par\pard\ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li49\sb66\sl-207\slmult0 \up0 \expndtw0\charscalex166 Jose' Luis Vidaurreta\par\pard\ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li34\sb13\sl-207\slmult0 \up0 \expndtw0\charscalex154 Manuel Cols Paez\par\pard\ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li39\sb75\sl-207\slmult0\up0 \expndtw0\charscalex159 Elba Sangronis\par\pard\ql \li39\sb148\sl-207\slmult0 \up0 \expndtw0\charscalex158 dose F. Chavez\par\pard\ql \li8433\sb0\sl-207\s

lmult0 \par\pard\ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li8433\sb0\sl-207\slmult0 \par\pard\ql \li20\sb22\sl-207\slmult0 \up0 \expndtw0\charscalex162 MarioEscalante \par\pard\sect\sectd\fs24\paperw12240\paperh15840{\bkmkstart Pg4}{\bkmkend Pg4}\par\pard\li1963\sb0\sl-207\slmult0\par\pard\li1963\sb0\sl-207\slmult0\par\pard\li1963\sb0\sl-207\slmult0\par\pard\li1963\sb0\sl-207\slmult0\par\pard\li1963\sb0\sl-207\slmult0\par\pard\li1963\sb0\sl-207\slmult0\par\pard\li1963\sb0\sl-207\slmult0\par\pard\li1963\sb0\sl-207\slmult0\par\pard\li1963\sb151\sl-207\slmult0\fi3484\tx9566 \up0 \expndtw0\charscalex161 \ul0\nosupersub\cf8\f9\fs18 NORMA VENEZOLANA\tab \up0 \expndtw0\charscalex161 COVENIN\par\pard\li1963\sb158\sl-207\slmult0\fi4243\tx9571 \dn2 \expndtw0\charscalex161 AGUA\tab \up0 \expndtw0\charscalex161 2120-84\par\pard\li1963\sb157\sl-207\slmult0\fi2961 \up0 \expndtw0\charscalex161 DETERMINACION DE HIERRO\par\pard\li1963\sb158\sl-207\slmult0\fi2822 \up0 \expndtw0\charscalex161 METODO DE LA FENANTROLINA\par\pard\li1963\sb0\s

l-207\slmult0\par\pard\li1963\sb172\sl-207\slmult0\fi2433\tx4656 \up0 \expndtw0\charscalex161 1\tab \dn3 \expndtw0\charscalex161 \ul0\nosupersub\cf7\f8\fs18\ulNORMAS COVENIN A CONSULTAR\par\pard\li1963\sb0\sl-207\slmult0\par\pard\li1963\sb80\sl-207\slmult0\fi71\tx3086\tx4771 \up0 \expndtw0\charscalex106 \ul0\nosupersub\cf8\f9\fs18 COVENIN\tab \up0 \expndtw0\charscalex161 10:XIII-010\tab \dn2 \expndtw0\charscalex161 Agua potable. Metodo para la toma de muestras.\par\pard\li1963\sb0\sl-207\slmult0\par\pard\li1963\sb52\sl-207\slmult0\fi3321\tx5668 \up0 \expndtw0\charscalex161 2\tab \dn3 \expndtw0\charscalex161 \ul0\nosupersub\cf7\f8\fs18\ul OBJETO\par\pard\li1963\sb0\sl-207\slmult0\par\pard\li1963\sb75\sl-207\slmult0\fi67\tx2673 \up0 \expndtw0\charscalex161 \ul0\nosupersub\cf8\f9\fs18 2.1\ta

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b \up0 \expndtw0\charscalex161 Esta norma contempla la determinacion de hierro en aguas natura-\par\pard\li1963\sb187\sl-207\slmult0\fi47 \up0 \expndtw0\charscalex161 les y tratadas,por el metodo de la fenantrolina.\par\pard\li1963\sb0\sl-207\slmult0\par\pard\li1963\sb32\sl-207\slmult0\fi52\tx2663 \up0 \expndtw0\charscalex161 2.2\tab \up0 \expndtw0\charscalex161 Este metodo permite detector directamente concentraciones entre\par\pard\li1963\sb153\sl-207\slmult0\fi52\tx2659\tx2927\tx3441\tx5404 \up0 \expndtw0\charscalex161 0,02\tab \up0 \expndtw-2\charscalex100 y\tab \up0 \expndtw0\charscalex161 4,0\tab \up0 \expndtw0\charscalex161 mg/l de hierro\tab \up0 \expndtw0\charscalex161 (total, disuelto o hierro ferroso) y pueden\par\pard\li1963\sb163\sl-207\slmult0\fi47 \up0 \expndtw0\charscalex161 determinarse concentraciones altos mediante el use do muestras peque-\par\pard\li1963\sb153\sl-207\slmult0\fi33\tx9398 \up0 \expndtw0\charscalex161 nas o diluciones. La concentraci6n minima detectable es\tab \up0 \expndtw0\charscalex161 50j con un\par\pard\li1963\sb153\sl-207\slmult0\fi38\tx4612\tx5126\tx7708\tx7963\up0 \expndtw0\charscalex161 espectrofot6metro a\tab \up0 \expndtw0\charscalex130 510\tab \dn2 \expndtw0\charscalex161 nm con una celda de\tab \up0 \expndtw0\charscalex161 1\tab \dn2 \expndtw0\charscalex161 cm.\par\pard\li1963\sb0\sl-218\slmult0\par\pard\li1963\sb61\sl-218\slmult0\fi2390\tx4737 \up0 \expndtw0\charscalex161 3\tab \up0 \expndtw0\charscalex161 \ul0\nosupersub\cf10\f11\fs20\ul PRINCIPIO Y RESUMEN DEL ENSAYO\par\pard\li1963\sb0\sl-207\slmult0\par\pard\li1963\sb60\sl-207\slmult0\fi33 \up0 \expndtw0\charscalex161 \ul0\nosupersub\cf8\f9\fs18 Elhierro puede ser disuelto y reducido al estado ferroso por ebtilli-\par\pard\li1963\sb158\sl-207\slmult0\fi33\tx7828 \up0 \expndtw0\charscalex161 ci6n con acidoa hidroxilamina y tratado con\tab \up0 \expndtw0\charscalex161 1,10-fenantrolin

a a pH\par\pard\li1963\sb153\sl-207\slmult0\fi33\tx2520\tx2783\tx3556 \up0 \expndtw0\charscalex161 3,2\tab \up0 \expndtw-2\charscalex100 a\tab \up0 \expndtw0\charscalex161 3,3.\tab \up0 \expndtw0\charscalex161 Tres moleculas de fenantrolinaquelan cada atomo de hie-\par\pard\li1963\sb157\sl-207\slmult0\fi33 \up0 \expndtw0\charscalex161 rro ferroso para formar un complejo rojo-anaranjado. La solucion co-\par\pard\li1963\sb172\sl-207\slmult0\fi23 \up0 \expndtw0\charscalex161 loreada cumple con la Ley de Beer; su intensidad es independiente del\par\pard\li1963\sb139\sl-207\slmult0\fi23\tx3945\tx4195\tx4463\tx4972 \dn2 \expndtw0\charscalex161 rango de pH de\tab \up0 \expndtw-2\charscalex100 3\tab \up0 \expndtw-2\charscalex100 a\tab \up0 \expndtw0\charscalex161 9.\tab \dn2 \expndtw0\charscalex161 A ualores de pH entre 2,9 y3,5 se asegura el desa\par\pard\li1963\sb153\sl-207\slmult0\fi23 \up0 \expndtw0\charscalex161 rrollo de una coloraci6n rapida an presencia do un exceso de fenantro\par\pard\li1963\sb153\sl-207\slmult0\fi14 \up0

\expndtw0\charscalex161 Tina.\par\pard\li1963\sb158\sl-207\slmult0\fi4 \up0 \expndtw0\charscalex161 En la presencia de cantidades excesivas de constituyentes organicos,\par\pard\sect\sectd\sbknone\cols3\colno1\colw7395\colsr20\colno2\colw544\colsr110\colno3\colw4041\colsr160\ql \li1968\sb148\sl-207\slmult0 \up0 \expndtw0\charscalex168 la muestra primero debe ser digerida con H\par\pard\column \ql\li1963\sb0\sl-144\slmult0 \par\pard\ql \li1963\sb0\sl-144\slmult0 \par\pard\ql\li20\sb33\sl-144\slmult0 \up0 \expndtw0\charscalex116 2SO4\par\pard\column \ql\li20\sb153\sl-207\slmult0 \up0 \expndtw0\charscalex172 para destruir comples \par\pard\sect\sectd\sbknone \li1963\sb43\sl-207\slmult0\fi9 \up0 \expndtw0\charscalex177 jos organicos y asegurar la completa disolucion del hierro. La solu-\par\pard\sect\sectd\sbknone \li1963\sb148\sl-207\slmult0\fi4\tx7281\tx7795\tx8971\up0 \expndtw0\charscalex177 cion resultante se ileva a normalidad do\tab \up0 \expndtw0\charscalex144 7-8\tab \up0 \expndtw0\charscalex135 N an HC1\tab \up0 \e

xpndtw0\charscalex177 y el hierro se\par\pard\sect\sectd\sbknone \li1963\sb159\sl-218\slmult0\fi0\tx10132 \dn3 \expndtw0\charscalex177 separa do las sustanciasinterferentes por extraccion de FeCl\tab \up0 \expndtw0\charscalex177 \ul0\nosupersub\cf9\f10\fs20 en eter\par\pard\ql \li9878\sb0\sl-170\slmult0 \up0 \expndtw-2\charscalex100 3 \par\pard\ql \li1958\sb0\sl-162\slmult0 \up0 \expndtw0\charscalex180 \ul0\nosupersub\cf8\f9\fs18 isopropllico. Despu6s de la re-extraccion delhierro en agua este se \par\pard\ql \li1958\sb159\sl-207\slmult0 \up0 \expndtw0\charscalex164 reduce con hidroxilamina. \par\pard\sect\sectd\fs24\paperw12240\paperh15840{\bkmkstart Pg5}{\bkmkend Pg5}\par\pard\ql \li10300\sb0\sl-207\slmult0\par\pard\ql\li10300\sb0\sl-207\slmult0 \par\pard\ql\li10300\sb0\sl-207\slmult0

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\par\pard\ql\li10300\sb0\sl-207\slmult0 \par\pard\ql\li10300\sb0\sl-207\slmult0\par\pard\ql\li10300\sb0\sl-207\slmult0 \par\pard\ql\li10300\sb0\sl-207\slmult0\par\pard\ql\li10300\sb0\sl-207\slmult0 \par\pard\ql\li10300\sb0\sl-207\slmult0\par\pard\ql\li10300\sb186\sl-207\slmult0 \up0 \expndtw0\charscalex167 \ul0\nosupersub\cf8\f9\fs18 /2 \par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb102\sl-207\slmult0\fi3936\tx6384 \up0 \expndtw0\charscalex160 4\tab \up0 \expndtw0\charscalex160 \ul0\nosupersub\cf7\f8\fs18\ulEQUIPO\par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb108\sl-207\slmult0\fi38\tx2750 \up0 \expndtw0\charscalex160 \ul0\nosupersub\cf8\f9\fs18 4.1\tab \dn2 \expndtw0\charscalex160 EQUIPO COLORIIETRICO. Se requiere uno de los siguientes:\par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb66\sl-207\slmult0\fi33\tx3009\tx7415\tx7934 \up0 \expndtw0\charscalex160 4.1.1\tab \up0 \expndtw0\charscalex160 \ul0\nosupersub\cf7\f8\fs18\ul Espectrofotometro\ul0\nosupersub\cf8\f9\fs18 . Para usarlo a\tab \up0 \expndtw0\charscalex130 510\tab \up0 \expndtw0\charscalex160 nm, provisto de un paso\par\pard\li2063\sb158\sl-207\slmult0\fi33\tx3407\tx3662 \up0 \expndtw0\charscalex160 de luzde\tab \up0 \expndtw0\charscalex160 1\tab \up0 \expndtw0\charscalex160 cm de longitud o mayor.\par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb61\sl-207\slmult0\fi24\tx3004\tx9758\tx10003 \up0 \expndtw0\charscalex160 4.1.2\tab \up0 \expndtw0\charscalex160 \ul0\nosupersub\cf7\f8\fs18\ul Fotometro con filtro\ul0\nosupersub\cf8\f9\fs18 , provisto de un Paso de luz de\tab \up0 \expndtw0\charscalex160 1\tab \up0 \expndtw0\charscalex160 cm de\par\pard\li2063\sb158\sl-207\slmult0\fi24 \up0 \expndtw0\charscalex160 longitud y equipado con un filtro verde conun maximo de transmitan-\par\pard\li2063\sb148\sl-207\slmult0\fi19\tx3907\tx443

0 \up0 \expndtw0\charscalex160 cia cercano a\tab \up0 \expndtw0\charscalex132 510\tab \up0 \expndtw0\charscalex160 nm.\par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb66\sl-207\slmult0\fi14\tx2985\tx5467\tx5971 \up0 \expndtw0\charscalex160 4.1.3\tab \up0 \expndtw0\charscalex160 \ul0\nosupersub\cf7\f8\fs18\ul TubosdeNessler\ul0\nosupersub\cf8\f9\fs18 de\tab \up0 \expndtw0\charscalex130 100\tab \up0 \expndtw0\charscalex160 ml, de forma alta.\par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb66\sl-207\slmult0\fi4\tx2721 \up0 \expndtw0\charscalex160 4.2\tab \dn2 \expndtw0\charscalex160 MATERIAL DE VIDRIO LAVADO CON ACIDO\par\pard\li2063\sb158\sl-207\slmult0\fi0\tx8179 \up0 \expndtw0\charscalex160 Se lavatodo el material con acido clorhidrico\tab \dn2 \expndtw0\charscalex160 (HC1) concentrado y\par\pard\li2063\sb158\sl-207\slmult0\fi4 \up0 \expndtw0\charscalex160 se enjuaga con agua destilada antes deusarlo, Para eliminar deposi-\par\pard\li2063\sb148\sl-207\slmult0\fi9\tx2980 \up0 \expndtw0\charscalex160 tor de\tab \d

n2 \expndtw0\charscalex160 6xido de hierro.\par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb61\sl-207\slmult0\fi0\tx2712\tx6095\tx6600 \up0 \expndtw0\charscalex160 4.3\tab \dn2 \expndtw0\charscalex123 EIIBUDOS DE SEPARACION, de\tab \up0 \expndtw0\charscalex128 125\tab \dn2 \expndtw0\charscalex160 ml con have de teflon.\par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb104\sl-207\slmult0\fi3643\tx6081 \up0 \expndtw0\charscalex160 5\tab \dn2 \expndtw0\charscalex160 \ul0\nosupersub\cf7\f8\fs18\ul REACTIVOS\par\pard\qj \li2059\ri1236\sb256\sl-353\slmult0 \up0 \expndtw0\charscalex158 \ul0\nosupersub\cf9\f10\fs20 Todos los reactivos deberan ser de grado analitico y bajo contenido \line \up0 \expndtw0\charscalex179 \ul0\nosupersub\cf8\f9\fs18 de hierro yalmacenados an botellas con tapa de vidrio. Las solucio \line \up0 \expndtw0\charscalex173 nes deberan prepararse con agua destilada, deionizada, Libre de meta\line \dn2 \expndtw0\charscalex174 les, con una conductancia especifica entre \

up0 \expndtw0\charscalex158 0,5 \up0 \expndtw-2\charscalex100 a \up0 \expndtw-2\charscalex100 5 \dn2 \expndtw0\charscalex143 micromhos-cm maxi \par\pard\ql \li2035\ri1236\sb24\sl-357\slmult0\fi19 \up0 \expndtw0\charscalex176 mo. Los reactivos deben almacenarse an botellas de vidrio bien tapa \up0 \expndtw0\charscalex180 das. El acido clorhidrico y las soluciones de acetato de amonio son \up0 \expndtw0\charscalex179 estables indefinidamente si estan bien tapadas. La hidroxilamina, \up0 \expndtw0\charscalex182 la fenantrolina y las soluciones de reserva dehierro son estables \up0 \expndtw0\charscalex179 por varios meses. Las soluciones patron de hierro no son estables \up0 \expndtw0\charscalex179 y deben prepararse diariamente a partir de la solucion de reserva. \up0 \expndtw0\charscalex175

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Los patrones visuales an tubas de Nessler son estables por varios me \up0 \expndtw0\charscalex176 ses si estan sellados y protegidos de la luz. \par\pard\sect\sectd\fs24\paperw12240\paperh15840{\bkmkstart Pg6}{\bkmkend Pg6}\par\pard\ql \li10238\sb0\sl-207\slmult0 \par\pard\ql\li10238\sb0\sl-207\slmult0 \par\pard\ql\li10238\sb0\sl-207\slmult0 \par\pard\ql\li10238\sb0\sl-207\slmult0 \par\pard\ql\li10238\sb0\sl-207\slmult0 \par\pard\ql\li10238\sb0\sl-207\slmult0 \par\pard\ql\li10238\sb0\sl-207\slmult0 \par\pard\ql\li10238\sb0\sl-207\slmult0 \par\pard\ql\li10238\sb113\sl-207\slmult0 \up0 \expndtw0\charscalex167 \ul0\nosupersub\cf8\f9\fs18 /3 \par\pard\li1891\sb0\sl-207\slmult0\par\pard\li1891\sb0\sl-207\slmult0\par\pard\li1891\sb0\sl-207\slmult0\par\pard\li1891\sb45\sl-207\slmult0\fi48\tx2587\tx6494 \up0 \expndtw0\charscalex137 5.1\tab \up0 \expndtw0\charscalex112 ACIDOCLORHIDRICO CONCENTRADO\tab \up0 \expndtw0\charscalex137 (HC1), quo contenga menos de\par\pard\li1891\sb158\sl-207\slmult0\fi43\tx2961 \up0 \expndtw0\charscalex137 0,00005\tab \up0 \expndtw0\charscalex137 % de hierro.\par\pard\li1891\sb0\sl-207\slmult0\par\pard\li1891\sb71\sl-207\slmult0\fi38\tx2577\tx4430 \up0 \expndtw0\charscalex137 5.2\tab \up0 \expndtw0\charscalex110 HIDROXILAMINA\tab \up0 \expndtw0\charscalex137 (NH2OH.HC1).\par\pard\li1891\sb0\sl-207\slmult0\par\pard\li1891\sb186\sl-207\slmult0\fi33\tx2563\tx7900\tx8275 \dn2 \expndtw0\charscalex1375.3\tab \dn2 \expndtw0\charscalex137 SOLUCION DE HIDROXILAMINA. Se disuelven\tab \up0 \expndtw0\charscalex137 10\tab \up0 \expndtw0\charscalex137 g de hidroxilamina\par\pard\li1891\sb154\sl-230\slmult0\fi24\tx2313\tx2827 \up0 \expndtw0\charscalex137 an\tab \up0 \expndtw0\charscalex118 \ul0\nosupersub\cf9\f10\fs20 100\tab \up0 \expndtw0\charscalex137 ml de agua destilada.\par\pard\li1891\sb0\sl-207\slmult0\par\pard\li1891\sb37\sl-207\slmult0\fi24\tx2558\tx4924 \up0 \expndtw0\

charscalex137 \ul0\nosupersub\cf8\f9\fs18 5.4\tab \dn2 \expndtw0\charscalex112 ACETATO DE AMONIO\tab \dn2 \expndtw0\charscalex137 (NH4C2H302).\par\pard\li1891\sb0\sl-207\slmult0\par\pard\li1891\sb186\sl-207\slmult0\fi14\tx2553\tx5433 \up0 \expndtw0\charscalex137 5.5\tab \dn2 \expndtw0\charscalex118 ACIDO ACETICO GLACIAL\tab \dn2 \expndtw0\charscalex137 (CH3000H), concentrado.\par\pard\li1891\sb0\sl-230\slmult0\par\pard\li1891\sb149\sl-230\slmult0\fi14\tx2543\tx9297\tx9815 \up0 \expndtw0\charscalex137 \ul0\nosupersub\cf9\f10\fs20 5.6\tab \up0 \expndtw0\charscalex119 SOLUCION BUFFER DE ACETATO DE AMONIO. Se disuelven\tab \up0 \expndtw0\charscalex120 250\tab \up0 \expndtw0\charscalex137 g de\par\pard\li1891\sb158\sl-207\slmult0\fi0\tx4646\tx5155\tx9556\tx10075 \up0 \expndtw0\charscalex137 \ul0\nosupersub\cf8\f9\fs18 acetato de amonio an\tab \up0 \expndtw0\charscalex137 150\tab \up0 \expndtw0\charscalex137 ml de agua destilada. Se agregan\tab \up0 \expndtw0\charscalex137 700\tab \up0 \expndtw0\charscalex137 ml de\par\pard\ql \li

1891\sb141\sl-207\slmult0 \up0 \expndtw0\charscalex174 acido acatico glacial. Aun cuando el acetato do amonio tenga un \par\pard\qj \li1891\ri1451\sb27\sl-360\slmult0\fi9 \up0 \expndtw0\charscalex155 \ul0\nosupersub\cf9\f10\fs20 buen gradode pureza,contiene una cantidad significativa de hierro,_ \up0 \expndtw0\charscalex155 par lo cual deben preparerse nuevos patrones de referencia can cada \up0\expndtw0\charscalex151 buffer preparado. \par\pard\li1852\sb0\sl-207\slmult0\par\pard\li1852\sb52\sl-207\slmult0\fi48\tx2539\tx4780 \up0 \expndtw0\charscalex150 \ul0\nosupersub\cf8\f9\fs18 5.7\tab \up0 \expndtw0\charscalex117 ACETATO DE SODIO\tab \up0 \expndtw0\charscalex150 (NaC2H302.3H20).\par\pard\li1852\sb0\sl-207\slmult0\par\pard\li1852\sb181\sl-207\slmult0\fi43\tx2534\tx8251\tx8769 \up0 \expndtw0\charscalex150 5.8\tab \up0 \expndtw0\charscalex137 SOLUCION DE ACETATO DESODIO. Se disuelven\tab \up0 \expndtw0\charscalex150 200\tab \up0 \expndtw0\charscalex150 g de acetate de\par\pard\li1852\sb139\sl-230\slmult0\fi33\tx3067\tx35

90 \up0 \expndtw0\charscalex150 \ul0\nosupersub\cf9\f10\fs20 sodio en\tab \up0 \expndtw0\charscalex120 800\tab \up0 \expndtw0\charscalex150 ml de agua destilada.\par\pard\li1852\sb0\sl-207\slmult0\par\pard\li1852\sb62\sl-207\slmult0\fi38\tx2543\tx6700 \up0 \expndtw0\charscalex150 \ul0\nosupersub\cf8\f9\fs18 5.9\tab \up0 \expndtw0\charscalex113 1,10-FENANTROLINA MONOHIDRATADA\tab \up0 \expndtw0\charscalex150 \ul0\nosupersub\cf9\f10\fs20 (C12H8N2.H2O).\par\pard\li1852\sb0\sl-207\slmult0\par\pard\li1852\sb182\sl-207\slmult0\fi33\tx2654\tx7857\tx8366\tx9163\tx9307\tx9417 \up0 \expndtw0\charscalex150 \ul0\nosupersub\cf8\f9\fs18 5.10\tab\up0 \expndtw0\charscalex136 SOLUCION DE FENANTROLINA. Se disuelven\tab \up0 \expndtw0\charscalex130 100\tab \up0 \expndtw0\charscalex150 mg de\tab \up0 \expndt

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w-4\charscalex100 1\tab \up0 \expndtw-4\charscalex100 ,\tab \up0 \expndtw0\charscalex150 10-Fenan-\par\pard\li1852\sb153\sl-207\slmult0\fi28\tx2932\tx4108\tx4617 \up0 \expndtw0\charscalex150 trolina\tab \up0 \expndtw0\charscalex150 (5.9) an\tab \up0 \expndtw0\charscalex128 100\tab \up0 \expndtw0\charscalex150 ml de agua destilada par agitacion y calenta-\par\pard\li1852\sb157\sl-207\slmult0\fi19\tx3052 \up0 \expndtw0\charscalex150 miento a\tab \up0 \expndtw0\charscalex150 809C, Pero no debe hervir. Si la solucion esta oscura se\par\pard\li1852\sb153\sl-207\slmult0\fi14\tx9268\tx9527 \up0 \expndtw0\charscalex150 descarta. El calentamiento no as necesario si se anaden\tab \up0 \expndtw0\charscalex150 2\tab \up0 \expndtw0\charscalex150 gotas de\par\pard\li1852\sb158\sl-207\slmult0\fi4\tx8107\tx9134 \up0 \expndtw0\charscalex150 acido clorhidrico concentrado al agua destilada\tab \up0 \expndtw0\charscalex114 (NOTA:\tab \up0 \expndtw0\charscalex150 Para solu-\par\pard\li1852\sb148\sl-207\slmult0\fi4\tx4483\tx8620\tx8870 \up0 \expndtw0\charscalex150 ciones con menos de\tab \up0 \expndtw0\charscalex150 100 /4gde hierro as suficiente\tab \up0 \expndtw0\charscalex150 1\tab \up0 \expndtw0\charscalex150 ml do este\par\pard\li1852\sb130\sl-230\slmult0\fi0 \up0 \expndtw0\charscalex150 \ul0\nosupersub\cf9\f10\fs20 reactiuo).\par\pard\li1852\sb0\sl-207\slmult0\par\pard\li1852\sb62\sl-207\slmult0\fi0\tx2625\tx7310 \up0 \expndtw0\charscalex150 \ul0\nosupersub\cf8\f9\fs18 5.11\tab \up0 \expndtw0\charscalex115 SOLUCION DE PERMANGANATO DE POTASIO\tab \up0 \expndtw0\charscalex150 0,1N\par\pard\li1852\sb0\sl-207\slmult0\par\pard\li1852\sb70\sl-207\slmult0\fi0\tx2620\tx6264\up0 \expndtw0\charscalex150 5.12\tab \dn2 \expndtw0\charscalex119 SOLUCION DE ACIDO SULFURICO\tab \up0 \expndtw0\charscalex150 6N\par\pard\sect\sectd\fs24\paperw12240\paperh15840{\bkmkstart Pg7}{\bkmkend Pg7}\par\pard\ql \li10454\sb0\sl-20

7\slmult0 \par\pard\ql\li10454\sb0\sl-207\slmult0 \par\pard\ql\li10454\sb0\sl-207\slmult0 \par\pard\ql\li10454\sb0\sl-207\slmult0 \par\pard\ql\li10454\sb0\sl-207\slmult0 \par\pard\ql\li10454\sb0\sl-207\slmult0 \par\pard\ql\li10454\sb0\sl-207\slmult0 \par\pard\ql\li10454\sb0\sl-207\slmult0 \par\pard\ql\li10454\sb0\sl-207\slmult0 \par\pard\ql\li10454\sb66\sl-207\slmult0 \up0 \expndtw0\charscalex167\ul0\nosupersub\cf8\f9\fs18 /4 \par\pard\li2256\sb0\sl-207\slmult0\par\pard\li2256\sb0\sl-207\slmult0\par\pard\li2256\sb0\sl-207\slmult0\par\pard\li2256\sb135\sl-207\slmult0\fi9\tx3043\tx7175\tx7430 \up0 \expndtw0\charscalex138 5.13\tab \up0 \expndtw0\charscalex116 ALAMBRE DE HIERRO ELECTROLITICO\tab \up0 \expndtw0\charscalex138 0\tab \up0 \expndtw0\charscalex138 SULFATO FERRO AMONICO,\par\pard\li2256\sb167\sl-207\slmult0\fi263 \up0 \expndtw0\charscalex138 Fe(NH4)2(504)2.6H20\par\pard\li2256\sb0\sl-207\slmult0\par\pard\li2256\sb181\sl-207\slmult0\fi0\tx3028\tx6921 \up0 \expndtw0\charscalex138 5.14\tab \dn2 \expndtw0\charscalex118 SO

LUCION DE RESERVA DE HIERRO\tab \up0 \expndtw0\charscalex138 (200,,_g/ml).\par\pard\li2256\sb153\sl-207\slmult0\fi0\tx6787\tx8476 \up0 \expndtw0\charscalex138 Para prepararla puede usarse metal\tab \up0 \expndtw0\charscalex138 (a) o la sal\tab \up0 \expndtw0\charscalex138 (b):\par\pard\ql \li2236\ri1198\sb15\sl-360\slmult0\fi19 \up0 \expndtw0\charscalex176 (a) Para preparar la solucion debe usarsealambre do hierro electro \line \up0 \expndtw0\charscalex179 litico o "alambrede hierro Para estandarizaci6n". Si fuese necesa \line \up0 \expndtw0\charscalex177 rio se limpia el alambre con papel arena fino Para eliminar cual-\line \up0\expndtw0\charscalex174 quier cubierta do \up0 \expndtw0\charscalex178 6xido y Para producir una superficie brillante. \par\pard\li2188\sb130\sl-207\slmult0\fi43\tx3403\tx3926 \dn2 \expndtw0\charscalex157 Se pesan\tab \up0 \expndtw0\charscalex135 200\tab \dn2 \expndtw0\charscalex171 mg del alambre y se colocan en un matraz aforado de\par\pard\li2188\sb143\sl-207\slmult0\fi52\tx2491\tx3004\tx4953\t

x5337\tx9744 \up0 \expndtw0\charscalex171 1\tab \up0 \expndtw0\charscalex171 1.\tab \dn2 \expndtw0\charscalex171 Se disuelve en\tab \up0 \expndtw0\charscalex12720\tab \dn2 \expndtw0\charscalex171 ml de solucion de acido sulfurico\tab \dn2\expndtw0\charscalex171 6N y se\par\pard\li2188\sb167\sl-207\slmult0\fi47 \up0 \expndtw0\charscalex171 diluye haste el aforo con ague destilada libre de hierro.\par\pard\li2188\sb140\sl-230\slmult0\fi52\tx2616\tx2995 \up0 \expndtw0\charscalex171 (1\tab \up0 \expndtw0\charscalex108 \ul0\nosupersub\cf9\f10\fs20 ml\tab \up0 \expndtw0\charscalex171 = 200/ de hierro).\par\pard\li2188\sb0\sl-207\slmult0\par\pard\li2188\sb52\sl-207\slmult0\fi43 \up0 \expndtw0\charscalex171 \ul0\nosupersub\cf8\f9\fs18 (b) Si se prefiere utilizer sulfato ferro-am6nico, se agregan

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lenta\par\pard\li2188\sb138\sl-207\slmult0\fi33\tx3004\tx3398\tx8044\tx8438 \up0 \expndtw0\charscalex140 mente\tab \up0 \expndtw0\charscalex130 20\tab \up0 \expndtw0\charscalex171 ml de acido sulfurico concentrado a\tab \up0 \expndtw0\charscalex129 50\tab \up0 \expndtw0\charscalex171 ml de agua destilada\par\pard\li2188\sb172\sl-207\slmult0\fi47\tx5332\tx5476\tx6095 \dn2 \expndtw0\charscalex171 yen ella se disuelven\tab \up0 \expndtw-4\charscalex100 1\tab \up0 \expndtw0\charscalex146 ,404\tab \dn2 \expndtw0\charscalex171 g de sulfato ferro-am6nico. Seagre-\par\pard\li2188\sb146\sl-207\slmult0\fi28\tx7262\tx7920\tx10243 \up0 \expndtw0\charscalex166 ga solucion de permanganato de potasio\tab \up0 \expndtw0\charscalex134 0,1N\tab \up0 \expndtw0\charscalex171 (5.11) gota a gota\tab \dn3 \expndtw0\charscalex171 ,,has-\par\pard\li2188\sb156\sl-207\slmult0\fi33\tx10382\tx10636 \dn2 \expndtw0\charscalex171 ta que aparezca un leve color rosado persistente. Se diluye a\tab \up0 \expndtw0\charscalex171 1\tab \up0 \expndtw0\charscalex171 li\par\pard\li2188\sb153\sl-207\slmult0\fi23\tx8827\tx9206\tx9580 \dn2 \expndtw0\charscalex171 tro con ague destilada libre de hierro y se mezcla\tab \up0\expndtw0\charscalex171 (1\tab \up0 \expndtw0\charscalex117 ml\tab \up0 \expndtw0\charscalex171 = 200//,t,,g\par\pard\li2188\sb138\sl-207\slmult0\fi23 \up0 \expndtw0\charscalex171 de hierro).\par\pard\li2188\sb0\sl-207\slmult0\par\pard\li2188\sb57\sl-207\slmult0\fi14\tx2976 \up0 \expndtw0\charscalex171 5.15\tab \dn3 \expndtw0\charscalex145 SOLUCIONES PATRONDEHIERRO. Deben prepararse diariamente pa-\par\pard\li2188\sb139\sl-230\slmult0\fi4 \up0 \expndtw0\charscalex171 \ul0\nosupersub\cf9\f10\fs20 ra su uso.\par\pard\li2188\sb0\sl-207\slmult0\par\pard\li2188\sb57\sl-207\slmult0\fi4\tx3225\tx6974\tx7363 \up0 \expndtw0\charscalex171 \ul0\nosupersub\cf8\f9\fs18 5.15.1\tab \dn2 \expndtw0\charscalex171 Se transfiere c

on una pipeta\tab \dn2 \expndtw0\charscalex127 50\tab \dn3 \expndtw0\charscalex171 ml de solucion de reserve\par\pard\li2188\sb153\sl-207\slmult0\fi0\tx3527\tx7396\tx7651 \up0 \expndtw0\charscalex171 do hierro\tab \dn3 \expndtw0\charscalex171 (5.14) a un matraz aforado do\tab \dn3 \expndtw0\charscalex171 1\tab \dn3 \expndtw0\charscalex171 litro y se diluye haste el\par\pard\sect\sectd\sbknone\cols2\colno1\colw8839\colsr60\colno2\colw3201\colsr160\ql \li2203\sb153\sl-207\slmult0\tx7900\tx8284\tx8562 \up0 \expndtw0\charscalex180 aforo con ague destilada libre de hierro \up0 \expndtw0\charscalex125 (1\tab \up0 \expndtw0\charscalex117 ml\tab \up0 \expndtw0\charscalex110 =\tab \up0 \expndtw0\charscalex121 10\par\pard\column \ql \li2193\sb0\sl-144\slmult0 \par\pard\ql \li2193\sb0\sl-144\slmult0\par\pard\ql \li20\sb14\sl-144\slmult0 \up0 \expndtw0\charscalex161 /t-"g de Fe). \par\pard\sect\sectd\sbknone \li2193\sb140\sl-207\slmult0\fi19\tx3240\tx6993\tx7252 \up0 \expndtw0\charscalex161 5.15.2\tab \up0 \expndtw0\charscalex161 Se tr

ansfiere con una pipeta\tab \up0 \expndtw0\charscalex161 5\tab \up0 \expndtw0\charscalex161 ml de la solucion de reserve\par\pard\sect\sectd\sbknone \li2193\sb138\sl-230\slmult0\fi14\tx3523 \up0 \expndtw0\charscalex161 \ul0\nosupersub\cf9\f10\fs20 de hierro\tab \up0 \expndtw0\charscalex161 (5.14) a un matraz aforado doI litro y se diluye haste el\par\pard\sect\sectd\sbknone \li2193\sb149\sl-207\slmult0\fi0\tx7646\tx8025\tx8404\tx8687\tx9124 \up0 \expndtw0\charscalex161 \ul0\nosupersub\cf8\f9\fs18 aforo con ague destilada libre de hierro.\tab \up0 \expndtw0\charscalex161 (1\tab \up0 \expndtw0\charscalex117 ml\tab \up0 \expndtw0\charscalex120 =\tab \up0 \expndtw0\charscalex161 1\tab \up0 \expndtw0\charscalex161.g do Fe).\par\pard\sect\sectd\sbknone \li2193\sb0\sl-207\slmult0\par\pard\li2193\sb57\sl-207\slmult0\fi9\tx2980\tx4800\tx5044 \up0 \expndtw0\charscalex161 5.16\tab \up0 \expndtw0\charscalex126 DI-ISOPROPILO\tab \up0 \expndtw-2\charscalex100 0\tab \up0 \expndtw0\charscalex161 ETER ISOPROPILICO\par\pard\sect\sectd\fs24\

paperw12240\paperh15840{\bkmkstart Pg8}{\bkmkend Pg8}\par\pard\ql \li10358\sb0\sl-207\slmult0 \par\pard\ql\li10358\sb0\sl-207\slmult0 \par\pard\ql\li10358\sb0\sl-207\slmult0 \par\pard\ql\li10358\sb0\sl-207\slmult0 \par\pard\ql\li10358\sb0\sl-207\slmult0 \par\pard\ql\li10358\sb0\sl-207\slmult0 \par\pard\ql\li10358\sb0\sl-207\slmult0 \par\pard\ql\li10358\sb0\sl-207\slmult0 \par\pard\ql\li10358\sb53\sl-207\slmult0 \up0 \expndtw0\charscalex167 \ul0\nosupersub\cf8\f9\fs18 /5 \par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb163\sl-207\slmult0\fi2995\tx5438 \up0 \expndtw0\charscalex145 6\tab \dn2 \expndtw0\charscalex145 \ul0\nosupersub\cf7\f8\fs18\ul CONDICIONES DE ENSAYO\par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\

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sb0\sl-207\slmult0\par\pard\li2063\sb113\sl-207\slmult0\fi4\tx2731 \up0 \expndtw0\charscalex145 \ul0\nosupersub\cf8\f9\fs18 6.1\tab \up0 \expndtw0\charscalex145INTERFERENCIAS\par\pard\li2063\sb0\sl-230\slmult0\par\pard\li2063\sb49\sl-230\slmult0\fi0\tx2971 \up0 \expndtw0\charscalex145 6.1.1\tab \up0 \expndtw0\charscalex50 \ul0\nosupersub\cf9\f10\fs20 l F\t \up0 \expndtw0\charscalex145 \ul0\nosupersub\cf8\f9\fs18 uchas de las sustancias interferentes son agentes fuertemen\par\pard\ql \li2063\sb119\sl-207\slmult0\tx8932 \up0 \expndtw0\charscalex182 to oxidantes tales como: cianuro, nitrito y fosfatos \tab \up0 \expndtw0\charscalex178(polifosfatos \par\pard\ql \li2054\ri1384\sb35\sl-350\slmult0 \up0 \expndtw0\charscalex170 mas que ortofosfatas), cromo, zinc an concentraciones que exceden \line \up0 \expndtw0\charscalex124 10 \up0 \expndtw0\charscalex173 veces la de hierro, cobalto y cobra an concentraciones mayores \line \dn2 \expndtw0\charscalex132 de \up0 \expndtw-2\charscalex100 5 \dn3 \expndtw0\charscalex167 mg/l y niquelan concentraciones mayores de \dn2 \expndtw-2\charscalex100 2 \dn2 \expndtw0\charscalex174 mg/l. El bismu-\par\pard\ql \li2059\sb149\sl-207\slmult0 \up0 \expndtw0\charscalex177 to, cadmio, molibdato y plata precipitan con fenantrolina. \par\pard\ql \li2040\ri1380\sb147\sl-360\slmult0\fi9\tx2961 \up0 \expndtw0\charscalex169 6.1.2 \tab \up0 \expndtw0\charscalex182 La ebullici6n inicial con acido convierte los polifosfatos a \line\up0 \expndtw0\charscalex182 ortofoafatos y elimina cianuro y nitrito los cuales pueden interfe-\line \up0 \expndtw0\charscalex179 rir. La adici6n de un exceso de hidroxilamina eliminara errores \line \up0 \expndtw0\charscalex154 \ul0\nosupersub\cf9\f10\fs20 causados por concentracionesexcesivas de reactivos fuertemente oxi \line \up0 \expndtw0\charscalex149 dantes. \par\pard\ql \li2020\ri1384\sb120\sl-360\slmult0\fi14\tx2947 \up0 \expndtw0\ch

arscalex151 6.1.3 \tab \up0 \expndtw0\charscalex158 En presencia de iones metalicos qua causen interferencia, se \line\up0 \expndtw0\charscalex156 requiere un gran exceso de fenantrolina pars reemplazar aquella \line \up0 \expndtw0\charscalex155 acomplejada par los metales interferentes. Cuando hay una concen \up0 \expndtw0\charscalex159 traci6n excesiva de Tones metalicos interferentes, puede usarse el \up0 \expndtw0\charscalex154 m6todo de extracci6n. \par\pard\qj \li2011\ri1417\sb116\sl-365\slmult0\fi9\tx2927 \up0 \expndtw0\charscalex169 \ul0\nosupersub\cf8\f9\fs18 6.1.4 \tab \dn2 \expndtw0\charscalex175 Si la muestra eats muy coloreada, o presenta cantidades nota \line\up0 \expndtw0\charscalex176 bles de materia organica, puede ser necesario evaporar la muestra, \line \up0 \expndtw0\charscalex158 \ul0\nosupersub\cf9\f10\fs20 se incinera cuidadosamente ei residuo yse redisuelve an acido. La \line \up0 \expndtw0\charscalex181 \ul0\nosupersub\cf8\f9\fs18 incineraci6npuede hacerse an crisoles de silice, porcelana o piati-\l

ine \up0 \expndtw0\charscalex175 no qua hayan sido hervidos varias horas an soluci6n de acido clorhi \par\pard\li2011\sb116\sl-207\slmult0\fi0\tx2793\tx3047\tx3316 \up0 \expndtw0\charscalex155 drico\tab \up0 \expndtw0\charscalex155 1\tab \up0 \expndtw0\charscalex120 +\tab \up0 \expndtw0\charscalex155 1.\par\pard\sect\sectd\fs24\paperw12240\paperh15840{\bkmkstart Pg9}{\bkmkend Pg9}\par\pard\ql \li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb26\sl-207\slmult0 \up0 \expndtw0\charscalex170 \ul0\nosupersub\cf8\f9\fs18 /6 \par\pard\li2145\sb0\sl-230\slmult0\par\pard\li2145\sb0\sl-230\slmult0\par\pard\li2145\sb212\sl-230\slmult0\fi3273\tx5803 \up0 \expndtw0\charscalex162 7\tab \dn3 \expndtw0\charscalex162 \ul0\nosu

persub\cf10\f11\fs20\ul PROCEDIMIENTO\par\pard\li2145\sb0\sl-207\slmult0\par\pard\li2145\sb0\sl-207\slmult0\par\pard\li2145\sb89\sl-207\slmult0\fi28\tx2822 \up0\expndtw0\charscalex162 \ul0\nosupersub\cf8\f9\fs18 7.1\tab \up0 \expndtw0\charscalex162 PREPARACION DE LAS CURVAS DE CALIBRACION\par\pard\li2145\sb0\sl-207\slmult0\par\pard\li2145\sb66\sl-207\slmult0\fi24\tx3062\tx5712\tx7905 \up0 \expndtw0\charscalex162 7.1.1\tab \up0 \expndtw0\charscalex162 \ul0\nosupersub\cf7\f8\fs18\ul Para un intervalo de\tab \up0 \expndtw0\charscalex154 0 -100,eq .Ve/100\tab \up0 \expndtw0\charscalex162 ml de solucion final\ul0\nosupersub\cf8\f9\fs18.\par\pard\li2145\sb0\sl-207\slmult0\par\pard\li2145\sb66\sl-207\slmult0\fi19\tx3326\tx7080\tx7233\tx7512\tx7857\tx8251\tx8505\tx8774\tx9153 \dn3 \expndtw0\char

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scalex162 7.1.1.1\tab \dn3 \expndtw0\charscalex162 Se transfiere con Tina pipe'ua\t \up0 \expndtw0\charscalex120 \ul0\nosupersub\cf12\f13\fs14 a\tab \up0 \expndtw-4\charscalex100 2 \ul0\nosupersub\cf8\f9\fs18 \u-3?\tab \dn3 \expndtw0\charscalex120 ,\tab \dn3 \expndtw-2\charscalex100 ,,\tab \dn2 \expndtw0\charscalex162\ul0\nosupersub\cf13\f14\fs20\ul 6,\tab \up0 \expndtw0\charscalex162 \ul0\nosupersub\cf14\f15\fs12 8\tab \up0 \expndtw0\charscalex162 \ul0\nosupersub\cf12\f13\fs14 y \ul0\nosupersub\cf8\f9\fs18 ,\tab \up0 \expndtw0\charscalex162 \ul0\nosupersub\cf12\f13\fs14 10\tab \dn4 \expndtw0\charscalex162 ml\ul0\nosupersub\cf9\f10\fs20 de\ul0\nosupersub\cf12\f13\fs14 la solu-\par\pard\li2145\sb153\sl-207\slmult0\fi14\tx5020\tx9163\tx9667 \up0 \expndtw0\charscalex162 \ul0\nosupersub\cf8\f9\fs18 cion patron de hierro\tab \up0 \expndtw0\charscalex162 (5.15.1) a matraces aforados de\tab \up0 \expndtw0\charscalex128 100\tab \up0 \expndtw0\charscalex162 ml, se a-\par\pard\li2145\sb158\sl-207\slmult0\fi9\tx7344\tx8375\tx8625 \up0 \expndtw0\charscalex162 grega I ml de solucion de hidroxilamina\tab \up0 \expndtw0\charscalex162 (5.3) y\tab \up0 \expndtw0\charscalex162 1\tab \up0 \expndtw0\charscalex162 ml de solucion de\par\pard\li2145\sb148\sl-207\slmult0\fi0\tx4372 \up0 \expndtw0\charscalex162 acetato de sodio\tab \up0 \expndtw0\charscalex162(5.8) a cada matraz. Se diluye el contenido de ca-\par\pard\li2145\sb153\sl-207\slmult0\fi9\tx5260\tx5644\tx10060\tx10440 \up0 \expndtw0\charscalex162 da uno con alrededor de\tab \up0 \expndtw0\charscalex121 75\tab \up0 \expndtw0\charscalex162 ml de ague destilada y as agregan\tab \up0 \expndtw0\charscalex124 10\tab \up0 \expndtw0\charscalex162 ml\par\pard\li2145\sb153\sl-207\slmult0\fi9\tx5779\tx6926 \up0 \expndtw0\charscalex162 de solucion de fenantrolina\tab \up0 \expndtw0\charscalex162 (5.10).\tab \up0 \expndtw0\charscalex162 Se diluye a volumen y s

e mezcla\par\pard\li2145\sb153\sl-207\slmult0\fi4\tx7320 \up0 \expndtw0\charscalex162 vigorosamente, se deja an reposo por,10\tab \up0 \expndtw0\charscalex162 min.\par\pard\li2145\sb0\sl-207\slmult0\par\pard\li2145\sb66\sl-207\slmult0\fi0\tx3307 \up0 \expndtw0\charscalex162 7.1.1.2\tab \up0 \expndtw0\charscalex162 Se mide la absorbancia de cada soluci6n en una celda de\par\pard\li2145\sb120\sl-230\slmult0\fi0\tx2404\tx3057\tx3576 \up0 \expndtw-2\charscalex100 \ul0\nosupersub\cf9\f10\fs20 5\tab \dn2 \expndtw0\charscalex124 cm a\tab \dn2 \expndtw0\charscalex118 510\tab \dn2 \expndtw0\charscalex162 nm contra un blanco de referencia preparado con ague\ul0\nosupersub\cf10\f11\fs20\ul des\par\pard\ql \li2150\sb151\sl-207\slmult0 \up0 \expndtw0\charscalex182 \ul0\nosupersub\cf8\f9\fs18 tilada tratada con las cantidades especificadas de todos los reacti-\par\pard\ql \li2145\sb134\sl-230\slmult0 \up0 \expndtw0\charscalex160 \ul0\nosupersub\cf9\f10\fs20 vos, excepto con la solucion patron de hierro. Alternativamente, si \par\pard\qj

\li2140\ri1169\sb3\sl-360\slmult0 \up0 \expndtw0\charscalex175 \ul0\nosupersub\cf8\f9\fs18 se use agua destilada como referencia, deben corregirse los valores \line \up0 \expndtw0\charscalex171 de absorbancia Para las concentraciones patronde hierro sustrayendo \line \up0 \expndtw0\charscalex176 la absorbancia Para unblanco de reactivos leido contra agua destila \line \up0 \expndtw0\charscalex149 da. \par\pard\qj \li2126\ri1173\sb0\sl-360\slmult0\fi4 \up0 \expndtw0\charscalex172 Con los datos obtenidos se construye una curve de calibraci6n de ab\up0 \expndtw0\charscalex169 sorbancia contra mg de hierro. \par\pard\li2097\sb0\sl-207\slmult0\par\pard\li2097\sb39\sl-207\slmult0\fi28\tx3009\tx5659\tx6038\tx6302 \dn3 \expndtw0\charscalex165 7.1.2\tab \dn2 \expndtw0\charscalex165 \ul0\nosupersub\cf7\f8\fs18\ul Para un intervalo de\tab \up0 \expndtw0\charscalex124 50\tab \up0 \expndtw-2\charscalex100 a\tab \dn2 \expndtw0\charscalex165 500,9 Fe/100 ml de solucion final\ul0\nosupersub\cf8\f9\fs18 .\par\pard\li2097\sb162\sl-207\slmul

t0\fi14\tx7555\tx10550 \dn2 \expndtw0\charscalex165 Se sigue el procedimiento especificado on\tab \dn2 \expndtw0\charscalex165 7.1.1, Pero utilizando\tab \up0 \expndtw0\charscalex165 10,\par\pard\li2097\sb139\sl-207\slmult0\fi19\tx2630\tx3153\tx3542\tx3801\tx4190\tx8337 \up0 \expndtw0\charscalex165 20,\tab \up0 \expndtw0\charscalex165 30,\tab \up0 \expndtw0\charscalex129 40\tab \up0 \expndtw-2\charscalex100 y\tab \up0 \expndtw0\charscalex129 50\tab \dn2 \expndtw0\charscalex165 ml de solucion patron de hierro\tab \dn2 \expndtw0\charscalex165 (5.15.1) y semide\par\pard\li2097\sb158\sl-207\slmult0\fi14\tx5740\tx5990 \up0 \expndtw0\charscalex165 la absorbancia en celdas de\tab \up0 \expndtw0\charscalex165 1\tab \up0 \expndtw0\charscalex165 cm.\par\pard\li2097\sb0\sl-207\slmult0\par\pard\li209

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7\sb56\sl-207\slmult0\fi14\tx2755 \up0 \expndtw0\charscalex165 7.2\tab \up0 \expndtw0\charscalex165 HIERRO TOTAL\par\pard\li2097\sb0\sl-207\slmult0\par\pard\li2097\sb71\sl-207\slmult0\fi4\tx3009\tx8975\tx9355 \up0 \expndtw0\charscalex165 7.2.1\tab \dn2 \expndtw0\charscalex165 Se mezola la muestra vigorosamente y se miden\tab \up0 \expndtw0\charscalex121 50\tab \up0 \expndtw0\charscalex165 ml en unma-\par\pard\li2097\sb158\sl-207\slmult0\fi9\tx4574\tx5073\tx5476\tx9484\tx9744\up0 \expndtw0\charscalex165 traz Erlenmeyer de\tab \up0 \expndtw0\charscalex124 125\tab \up0 \expndtw0\charscalex117 ml\tab \dn2 \expndtw0\charscalex165 (Si la muestra contiene mas de\tab \up0 \expndtw-2\charscalex100 2\tab \up0 \expndtw0\charscalex165 mg de\par\pard\li2097\sb162\sl-207\slmult0\fi0 \up0 \expndtw0\charscalex165 Fe/l, se diluye una porcion medida exactamente que contenga no mas\par\pard\li2097\sb149\sl-207\slmult0\fi4\tx2491\tx3787\tx4171 \dn2 \expndtw0\charscalex121 do\tab \up0 \expndtw0\charscalex140 100 /zAg a\tab \up0 \expndtw0\charscalex127 50\tab \dn2 \expndtw0\charscalex165 ml, o as utilize mas fenantrolina yun Paso de luz\par\pard\sect\sectd\fs24\paperw12240\paperh15840{\bkmkstart Pg10}{\bkmkend Pg10}\par\pard\ql \li10339\sb0\sl-207\slmult0 \par\pard\ql\li10339\sb0\sl-207\slmult0 \par\pard\ql\li10339\sb0\sl-207\slmult0 \par\pard\ql\li10339\sb0\sl-207\slmult0 \par\pard\ql\li10339\sb0\sl-207\slmult0 \par\pard\ql\li10339\sb0\sl-207\slmult0 \par\pard\ql\li10339\sb0\sl-207\slmult0 \par\pard\ql\li10339\sb0\sl-207\slmult0 \par\pard\ql\li10339\sb0\sl-207\slmult0 \par\pard\ql\li10339\sb86\sl-207\slmult0 \up0 \expndtw0\charscalex167 \ul0\nosupersub\cf8\f9\fs18 /7 \par\pard\li2092\sb0\sl-207\slmult0\par\pard\li2092\sb0\sl-207\slmult0\par\pard\li2092\sb206\sl-207\slmult0\fi91\tx2577\tx2827\tx3091\tx3345 \up0 \expndtw0\charscalex169 de\tab \up0 \expndtw0\charscalex169 1\tab \up0 \expndtw-2\charscalex100

6\tab \up0 \expndtw-2\charscalex100 2\tab \up0 \expndtw0\charscalex169 cm).\par\pard\li2092\sb0\sl-207\slmult0\par\pard\li2092\sb71\sl-207\slmult0\fi86\tx3076\tx4521\tx4776\tx9695\tx9945 \up0 \expndtw0\charscalex169 7.2.2\tab \up0 \expndtw0\charscalex159 Se agregan\tab \up0 \expndtw-2\charscalex100 2\tab \up0 \expndtw0\charscalex169 ml de acido clorhidrico concentrado y\tab \up0 \expndtw0\charscalex169 1\tab \up0 \expndtw0\charscalex169 ml de\par\pard\li2092\sb163\sl-207\slmult0\fi76 \up0 \expndtw0\charscalex169 soluci6n de hidroxilamina. Se agregan unaspaces perlas de vidrio\par\pard\li2092\sb153\sl-207\slmult0\fi81 \up0 \expndtw0\charscalex169 y as calienta a ebullici6n. Para asegurar la disoluci6n de todo el\par\pard\li2092\sb158\sl-207\slmult0\fi76 \up0 \expndtw0\charscalex169 hierro,se continua la ebullici6n haste que el volumen se reduzca a\par\pard\li2092\sb143\sl-207\slmult0\fi81\tx2543\tx2812\tx3201\tx3868\tx9676\tx10065 \up0 \expndtw0\charscalex119 15\tab \up0 \expndtw-2\charscalex100 -\tab \up0 \expndtw0\charsca

lex127 20\tab \up0 \expndtw0\charscalex169 ml.\tab \dn2 \expndtw0\charscalex169(Si la muestra se incinera coma se describi6\tab \dn2 \expndtw0\charscalex118 \ul0\nosupersub\cf9\f10\fs20 an\tab \dn2 \expndtw0\charscalex169 \ul0\nosupersub\cf8\f9\fs18 6.1.4,\par\pard\li2092\sb163\sl-207\slmult0\fi67\tx5280\tx5529 \dn2 \expndtw0\charscalex169 se retoma el residua an\tab \up0 \expndtw-2\charscalex1002\tab \dn2 \expndtw0\charscalex169 ml de acido clorhidrico concentrado y 5 ml\par\pard\li2092\sb148\sl-207\slmult0\fi67 \up0 \expndtw0\charscalex169 de agua destilada). Se enfria a temperature ambiente y se transfie\par\pard\li2092\sb148\sl-207\slmult0\fi57\tx5524\tx5899\tx6172\tx6686 \up0 \expndtw0\charscalex169 re aun matraz aforado de\tab \up0 \expndtw0\charscalex127 50\tab \dn2 \expndtw-2\charscalex100 -\tab \dn2 \expndtw0\charscalex130 100\tab \dn2 \expndtw0\charscalex169 ml a a un tuba de Nessler. Se\par\pard\li2092\sb148\sl-207\slmult0\fi52\tx3201\tx3585\tx9412\tx9667 \up0 \expndtw0\charscalex153 agregan\tab \up0 \expndtw0\

charscalex124 10\tab \dn2 \expndtw0\charscalex169 ml de soluci6n buffer de acetato de amonio y\tab \up0 \expndtw-2\charscalex100 2\tab \up0 \expndtw0\charscalex169 ml de so-\par\pard\li2092\sb144\sl-230\slmult0\fi62 \up0 \expndtw0\charscalex169 \ul0\nosupersub\cf9\f10\fs20 luci6n de fenantrolina, se diluye hasta el aforo con ague destila=\par\pard\li2092\sb149\sl-207\slmult0\fi67\tx9672\tx10051 \dn2 \expndtw0\charscalex169 \ul0\nosupersub\cf8\f9\fs18 da, as mezcla a agita fuertemente y se deja an reposo par\tab \up0 \expndtw0\charscalex124 10\tab \up0 \expndtw0\charscalex120 a\par\pard\li2092\sb143\sl-207\slmult0\fi62\tx2534 \up0 \expndtw0\charscalex124 15\tab \up0 \expndtw0\charscalex169 min Para desarrollar el color al maxima.\par\pard\li2092\sb0\sl-230\slmult0\par\pard\li2092\sb24\sl-23

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0\slmult0\fi57\tx2798 \up0 \expndtw0\charscalex169 \ul0\nosupersub\cf9\f10\fs207.3\tab \dn2 \expndtw0\charscalex169 HIERRO FILTRABLE\par\pard\li2092\sb0\sl-230\slmult0\par\pard\li2092\sb25\sl-230\slmult0\fi52\tx3067 \up0 \expndtw0\charscalex169 7.3.1\tab \dn2 \expndtw0\charscalex169 Inmediatamente despues de recolectar la muestra, as filtra a\par\pard\li2092\sb130\sl-230\slmult0\fi52\tx6806 \up0\expndtw0\charscalex154 traves de una membrane filtrante de\tab \up0 \expndtw0\charscalex169 0,45/4.m a un matraz de vacio\par\pard\li2092\sb149\sl-207\slmult0\fi43\tx3840\tx4084\tx9916\tx10430 \up0 \expndtw0\charscalex157 \ul0\nosupersub\cf8\f9\fs18 qua contenga\tab \up0 \expndtw0\charscalex169 1\tab \dn2 \expndtw0\charscalex169 ml de acido clorhidrico concentrado par cada\tab \dn2 \expndtw0\charscalex132 100\tab \up0 \expndtw0\charscalex169 ml\par\pard\li2092\sb134\sl-230\slmult0\fi43 \up0 \expndtw0\charscalex169 \ul0\nosupersub\cf9\f10\fs20 de muestra.\par\pard\li2092\sb0\sl-230\slmult0\par\pard\li2092\sb20\sl-230\slmult0\fi33\tx3028 \up0 \expndtw0\charscalex169 7.3.2\tab \dn2 \expndtw0\charscalex169 Se analiza el filtrado Para determiner hierro filtrable to-\par\pard\li2092\sb149\sl-207\slmult0\fi33\tx2783\tx7315\tx8356 \up0 \expndtw0\charscalex169 \ul0\nosupersub\cf8\f9\fs18 tal\tab \dn2 \expndtw0\charscalex169 (7.2) y/o hierro ferroso filtrable\tab \dn2 \expndtw0\charscalex169 (7.4).\tab \dn2 \expndtw0\charscalex169 (Este procedimiento\par\pard\li2092\sb163\sl-207\slmult0\fi33 \up0 \expndtw0\charscalex169 tambi6n puede ser utilizado an el laboratorio, con el conocimiento\par\pard\li2092\sb153\sl-207\slmult0\fi28 \up0 \expndtw0\charscalex169 de que la exposici6n normal de la muestra al aire durante ei envio\par\pard\li2092\sb153\sl-207\slmult0\fi14 \up0 \expndtw0\charscalex169 puede provocar la precipitaci6n delhierro).\par\pard\li2092\sb0\sl-207\slmult0\par\pard\li2092\sb61\sl-207\slmult0

\fi19\tx3014 \up0 \expndtw0\charscalex169 7.3.3\tab \up0 \expndtw0\charscalex169Se calcula el hierro suspendido par diferencia entre el hie-\par\pard\li2092\sb153\sl-207\slmult0\fi14 \up0 \expndtw0\charscalex169 rro filtrable y el hierro total.\par\pard\li2092\sb0\sl-230\slmult0\par\pard\li2092\sb19\sl-230\slmult0\fi4\tx2755 \up0 \expndtw0\charscalex169 \ul0\nosupersub\cf9\f10\fs20 7.4\tab \dn2 \expndtw0\charscalex169 HIERRO FERROSO\par\pard\li2092\sb0\sl-207\slmult0\par\pard\li2092\sb62\sl-207\slmult0\fi0\tx3009 \up0 \expndtw0\charscalex169 \ul0\nosupersub\cf8\f9\fs18 7.4.1\tab \dn3 \expndtw0\charscalex169 Para determiner hierro ferroso, as acidifica una muestra par\par\pard\li2092\sb153\sl-207\slmult0\fi0\tx3787\tx4046\tx9883\tx10396 \up0 \expndtw0\charscalex160 separado con\tab \up0 \expndtw-2\charscalex100 2\tab \dn2 \expndtw0\charscalex169 ml de acido clorhidrico concentrado par cada\tab \up0 \expndtw0\charscalex132 100\tab \up0 \expndtw0\charscalex169 ml\par\pard\ql \li2097\sb156\sl-207\slmult0 \up0 \expndtw0\charscal

ex172 de muestra an el momenta de la recoleccio'n Para prevenir la oxida-\par\pard\sect\sectd\fs24\paperw12240\paperh15840{\bkmkstart Pg11}{\bkmkend Pg11}\par\pard\ql \li10415\sb0\sl-207\slmult0 \par\pard\ql\li10415\sb0\sl-207\slmult0 \par\pard\ql\li10415\sb0\sl-207\slmult0 \par\pard\ql\li10415\sb0\sl-207\slmult0 \par\pard\ql\li10415\sb0\sl-207\slmult0 \par\pard\ql\li10415\sb0\sl-207\slmult0 \par\pard\ql\li10415\sb0\sl-207\slmult0 \par\pard\ql\li10415\sb0\sl-207\slmult0 \par\pard\ql\li10415\sb0\sl-207\slmult0 \par\pard\ql\li10415\sb86\sl-207\slmult0 \up0\expndtw0\charscalex167 \ul0\nosupersub\cf8\f9\fs18 /8 \par\pard\ql \li2140\sb0\sl-207\slmult0 \par\pard\ql\li2140\sb0\sl-207\slmult0 \par\pard\ql\li2140\sb59\sl-207\slmult0 \up0 \expndtw0\charscalex187 ci6n. Se llena la botella directamente de la fuente y se tapa. \par\pard\li2136\sb0\sl-207\slmult0\par\pard\li2136\sb68\sl-207\slmult0\fi9\tx3067\tx10425 \dn2 \expndtw0\charscalex165 7.4.2\tab \dn2 \expndtw0\charscalex165 Inmediatamente antes del analisis se toma una porcion

de\tab \up0 \expndtw0\charscalex165 50 ml\par\pard\li2136\sb148\sl-207\slmult0\fi9 \up0 \expndtw0\charscalex166 de is muestra acidificada y se agrega 20 ml de solucion de fenantrolina y\par\pard\li2136\sb148\sl-207\slmult0\fi9\tx2529 \up0 \expndtw0\charscalex124 10\tab \dn3 \expndtw0\charscalex165 ml de is solucion deacetato de amonio y se agita vigorosamente.\par\pard\li2136\sb0\sl-230\slmult0\par\pard\li2136\sb29\sl-230\slmult0\fi0\tx3038\tx4612\tx5112\tx10535\tx10790 \up0\expndtw0\charscalex165 \ul0\nosupersub\cf9\f10\fs20 7.4.3\tab \up0 \expndtw0\charscalex155 Se diluye a\tab \dn2 \expndtw0\charscalex115 100\tab \dn2 \expndtw0\charscalex159 ml y se mide la intensidad de color entre\tab \dn2 \expndtw-2\charscalex100 5\tab \dn2 \expndtw0\charscalex120 a\par\pard\li2136\sb144\sl-207\slm

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ult0\fi0\tx2515\tx8342 \up0 \expndtw0\charscalex124 \ul0\nosupersub\cf8\f9\fs1810\tab \dn2 \expndtw0\charscalex165 minutos. No debe exponerse a la luz solar.\tab \dn2 \expndtw0\charscalex165 (El color se desarro-\par\pard\qj \li2107\ri1196\sb35\sl-360\slmult0\fi23 \up0 \expndtw0\charscalex176 lla rapidamente an presencia de un exceso de fenantrolina. El volu\up0 \expndtw0\charscalex169 men de fenantrolina dado as adecuado pare menos de'50 ^g de hierro \up0 \expndtw0\charscalex171 total; si estan presentes cantidades mayores debe usarse un volumen \up0 \expndtw0\charscalex168 mayor de fenantrolina o un reactivo mas concentrado). \par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb28\sl-207\slmult0\fi52\tx3014\up0 \expndtw0\charscalex162 7.4.4\tab \dn2 \expndtw0\charscalex162 Se calculael hierro ferrico por diferencia entre el hierro\par\pard\li2063\sb143\sl-230\slmult0\fi43 \up0 \expndtw0\charscalex162 \ul0\nosupersub\cf9\f10\fs20 ferroso y el hierro total.\par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb53\sl-207\slmult0\fi43\tx2740 \up0 \expndtw0\charscalex162 \ul0\nosupersub\cf8\f9\fs18 7.5\tab \up0 \expndtw0\charscalex162 fEDICION DEL COLOR\par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb66\sl-207\slmult0\fi38\tx3004 \up0 \expndtw0\charscalex162 7.5.1\tab \dn3 \expndtw0\charscalex162 Se prepare una aerie de patrones, pipeteando exactamente volume-\par\pard\li2063\sb148\sl-230\slmult0\fi33 \up0 \expndtw0\charscalex163 \ul0\nosupersub\cf9\f10\fs20 nee calculados de soluciones patron de hierro (debe usarse la solucion mas\par\pard\li2063\sb130\sl-230\slmult0\fi33 \up0 \expndtw0\charscalex143 dilulda Para medir porciones de 1 a 10/ug) a matraces Erlenmeyer de 125 ml,\par\pard\li2063\sb120\sl-230\slmult0\fi33\tx3662\tx4046\tx9340 \up0 \expndtw0\charscalex146 diluyendo a\tab \up0 \expndtw0\charscalex114 50\tab \dn2 \expndtw0\charscalex143 ml y continuando como se indica a par

tir de\tab \dn2 \expndtw0\charscalex162 7.2.\par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb58\sl-207\slmult0\fi28\tx3004 \up0 \expndtw0\charscalex162 \ul0\nosupersub\cf8\f9\fs18 7.5.2\tab \up0 \expndtw0\charscalex162 Para comparaci6nvisual, se prepare una aerie de por lo menos\par\pard\li2063\sb134\sl-230\slmult0\fi28\tx2471\tx5596\tx5841\tx6115 \up0 \expndtw0\charscalex114 \ul0\nosupersub\cf9\f10\fs20 10\tab \up0 \expndtw0\charscalex152 patrones an un rango de\tab \up0 \expndtw0\charscalex162 1\tab \up0 \expndtw0\charscalex120 a\tab \dn2 \expndtw0\charscalex162 1OO /c-,g de hierro en el volumen final\par\pard\li2063\sb130\sl-230\slmult0\fi24\tx2481\tx3000\tx9729\tx10238 \up0 \expndtw0\charscalex118 de\tab \up0 \expndtw0\charscalex118 100\tab \up0 \expndtw0\charscalex157 ml. Se comparan los colores an tubos de Nessler de\tab \up0 \expndtw0\charscalex116 100\tab \up0 \expndtw0\charscalex162 ml.\par\pard\li2063\sb0\sl-230\slmult0\par\pard\li2063\sb15\sl-230\slmult0\fi19\tx2995\tx8553\tx8812 \up0 \expndtw0\charscalex162

7.5.3\tab \up0 \expndtw0\charscalex162 \ul0\nosupersub\cf8\f9\fs18 Para la medidafotometrica, se use la Table\tab \up0 \expndtw0\charscalex162 1\tab \up0 \expndtw0\charscalex162 como guia Para\par\pard\li2063\sb154\sl-207\slmult0\fi14 \up0\expndtw0\charscalex162 seleccionar el Paso de luz apropiado. Se lean los patrones contra\par\pard\li2063\sb148\sl-207\slmult0\fi14\tx5971\tx6460\tx8947 \up0 \expndtw0\charscalex162 un blanco de ague destilada a\tab \up0 \expndtw0\charscalex130 100\tab \dn3 \expndtw0\charscalex162 % de transmitancia\tab \up0 \expndtw0\charscalex162 (absorbancia ce-\par\pard\li2063\sb153\sl-207\slmult0\fi9\tx10497\up0 \expndtw0\charscalex162 ro) y se construye una curve de calibracion incluyendo un blanco\tab \up0 \expndtw0\charscalex162 (ver\par\pard\li2063\sb129\sl-230\slmult0\fi9\tx3120 \up0 \expndtw0\charscalex145 \ul0\nosupersub\cf9\f10\fs20 seccion\tab \up0 \expndtw0\charscalex162 5.6).\par\pard\li2063\sb0\sl-207\slmult0\par\pard\li2063\sb57\sl-207\slmult0\fi9\tx2976 \up0 \expndtw0\charscalex162 \ul

0\nosupersub\cf8\f9\fs18 7.5.4\tab \up0 \expndtw0\charscalex162 Si las muestrasestan coloreadas o turbias, se hace una se-\par\pard\li2063\sb139\sl-230\slmult0\fi4 \up0 \expndtw0\charscalex162 \ul0\nosupersub\cf9\f10\fs20 gunda serie de muestras siguiendo todas las etapas del procedimien-\par\pard\li2063\sb149\sl-207\slmult0\fi4 \up0 \expndtw0\charscalex162 \ul0\nosupersub\cf8\f9\fs18 to sin adicionar fenantrolina. En lugar de ague destilada, se usa\par\pard\li2063\sb153\sl-207\slmult0\fi0\tx6864\tx7348 \up0 \expndtw0\charscalex162 el blanco Para llevarel fotometro a\tab \dn2 \expndtw0\charscalex128 100\tab \dn3 \expndtw0\charscalex162 % de transmitencia y se\par\pard\sect\sectd\fs24\paperw12240\paperh15840{\bkmkstart Pg12}{\bkmkend Pg12}\par\pard\ql \li10339\sb0\sl-253\slmult0 \par\pard

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\ql\li10339\sb0\sl-253\slmult0 \par\pard\ql\li10339\sb0\sl-253\slmult0 \par\pard\ql\li10339\sb0\sl-253\slmult0 \par\pard\ql\li10339\sb0\sl-253\slmult0 \par\pard\ql\li10339\sb0\sl-253\slmult0 \par\pard\ql\li10339\sb0\sl-253\slmult0 \par\pard\ql\li10339\sb140\sl-253\slmult0 \up0 \expndtw0\charscalex143 \ul0\nosupersub\cf16\f17\fs26 /\ul0\sub\cf8\f9\fs27 9 \par\pard\ql \li2049\sb0\sl-360\slmult0 \par\pard\ql\li2049\sb0\sl-360\slmult0 \par\pard\ql\li2049\ri1389\sb139\sl-360\slmult0\fi9 \up0 \expndtw0\charscalex180 lee cada desarrollo de las muestras con fenantrolina con el corres-\line \up0 \expndtw0\charscalex180 pondiente blanco sin fenantrolina. Se transforman las lectures ob-\line \up0 \expndtw0\charscalex177 tenidas en el fotometro en valores de hierro mediante la curve de \line \up0 \expndtw0\charscalex174 calibracion. \par\pard\qj \li2035\ri1407\sb20\sl-360\slmult0\fi4 \up0 \expndtw0\charscalex170 Este procedimiento no compensa la presencia deTones interferentes. \up0 \expndtw0\charscalex175 Si el color y la turbiedad esta'n ausentes, es ma's ra'pido e igualmen \up0 \expndtw0\charscalex187 to satisfactorio leer las muestras, al igual que los patrones, con\up0 \expndtw0\charscalex181 tra ague destilada. \par\pard\li3057\sb0\sl-230\slmult0\par\pard\li3057\sb0\sl-230\slmult0\par\pard\li3057\sb14\sl-230\slmult0\fi0\tx3849\tx4358 \up0 \expndtw-9\charscalex100 \ul0\nosupersub\cf9\f10\fs20 TABLA\tab \up0 \expndtw0\charscalex156 1.\tab \up0 \expndtw0\charscalex156 \ul0\nosupersub\cf10\f11\fs20\ul Seleccion de la longitud del peso de\par\pard\li3057\sb154\sl-207\slmult0\fi1305 \up0 \expndtw0\charscalex156 \ul0\nosupersub\cf7\f8\fs18\ul luz Para varies concentraciones de\par\pard\li3057\sb134\sl-230\slmult0\fi3110 \up0 \expndtw0\charscalex156 \ul0\nosupersub\cf10\f11\fs20\ul hierro\ul0\nosupersub\cf9\f10\fs20 .\par\pard\li2793\sb0\sl-230\slmult0\par\pard\li2793\sb0\sl-230\slmult0\par\pard\li27

93\sb25\sl-230\slmult0\fi1732 \up0 \expndtw0\charscalex136 \u-3?,cg Fe\par\pard\li2793\sb34\sl-207\slmult0\fi5438 \up0 \expndtw0\charscalex136 \ul0\nosupersub\cf8\f9\fs18 Paso de Luz\par\pard\li2793\sb37\sl-207\slmult0\fi0\tx5515 \up0 \expndtw0\charscalex136 Volumen Final\tab \up0 \expndtw0\charscalex136 Volumen Final\par\pard\li2793\sb125\sl-230\slmult0\fi518\tx3700\tx5913\tx6484\tx8745 \up0 \expndtw0\charscalex136 \ul0\nosupersub\cf9\f10\fs20 50\tab \up0 \expndtw0\charscalex136 ml\tab \up0 \expndtw0\charscalex136 100\tab \up0 \expndtw0\charscalex136 -ml\tab \up0 \expndtw0\charscalex136 cm\par\pard\li2793\sb0\sl-230\slmult0\par\pard\li2793\sb140\sl-230\slmult0\fi384\tx5908\tx8884 \up0 \expndtw0\charscalex136 50-200\tab \up0 \expndtw0\charscalex136 100-400\tab \up0 \expndtw0\charscalex1361\par\pard\li2793\sb154\sl-207\slmult0\fi379\tx6028\tx8870 \up0 \expndtw0\charscalex136 \ul0\nosupersub\cf8\f9\fs18 25-100\tab \up0 \expndtw0\charscalex136 50-200\tab \up0 \expndtw0\charscalex136 2\par\pard\li2793\sb148\sl-207\slmult0\fi384

\tx3691\tx6024\tx6542\tx8875 \up0 \expndtw0\charscalex136 10-\tab \up0 \expndtw0\charscalex136 40\tab \up0 \expndtw0\charscalex136 20-\tab \up0 \expndtw0\charscalex136 80\tab \up0 \expndtw0\charscalex136 5\par\pard\li2793\sb129\sl-230\slmult0\fi508\tx3691\tx6028\tx6537\tx8755 \up0 \expndtw0\charscalex136 \ul0\nosupersub\cf9\f10\fs20 5-\tab \up0 \expndtw0\charscalex136 20\tab \up0 \expndtw0\charscalex136 10-\tab \up0 \expndtw0\charscalex136 40\tab \up0 \expndtw0\charscalex13610\par\pard\li1972\sb0\sl-207\slmult0\par\pard\li1972\sb0\sl-207\slmult0\par\pard\li1972\sb0\sl-207\slmult0\par\pard\li1972\sb133\sl-207\slmult0\fi23\tx2644 \up0 \expndtw0\charscalex162 \ul0\nosupersub\cf8\f9\fs18 7.6\tab \dn2 \expndtw0\charscalex162 IIUESTRAS QUE CONTIENEN INTERFERENCIAS ORGANICAS\par\pard\li1972\sb0\sl-207\slmult0\par\pard\li1972\sb47\sl-207\slmult0\fi23\tx2908 \up0 \expndtw0\charscalex162 7.6.1\tab \up0 \expndtw0\charscalex162 Las muestras que contengan sustancias orga'nicas an cantida-\par\pard\li1972\sb157\sl-207\slmult0\fi14 \up0 \

expndtw0\charscalex162 des sustanciales se digieren de acuerdo a lo siguiente:\par\pard\li1972\sb0\sl-207\slmult0\par\pard\li1972\sb62\sl-207\slmult0\fi4\tx3143\up0 \expndtw0\charscalex162 7.6.1.1\tab \up0 \expndtw0\charscalex162 Se agitala muestra Para obtener una suspension homogenea.\par\pard\li1972\sb157\sl-207\slmult0\fi0\tx5620\tx9235 \up0 \expndtw0\charscalex155 Se mide un volumen adecuado\tab \up0 \expndtw0\charscalex162 (determinado segun la Table\tab \up0 \expndtw0\charscalex162 2) con Una\par\pard\li1972\sb158\sl-207\slmult0\fi0 \up0 \expndtw0\charscalex162 pipeta o matraz aforado y se transfiere a una capsula de evaporacion\par\pard\li1972\sb158\sl-207\slmult0\fi14\tx6767\tx7281 \dn2 \expndtw0\charscalex162 (si el volumen requerido as mayor de\tab \up0 \expndtw0\charscalex131

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250\tab \up0 \expndtw0\charscalex162 ml, se transfiere an por-\par\pard\sect\sectd\fs24\paperw12240\paperh15840{\bkmkstart Pg13}{\bkmkend Pg13}\par\pard\ql \li10560\sb0\sl-207\slmult0 \par\pard\ql\li10560\sb0\sl-207\slmult0 \par\pard\ql\li10560\sb0\sl-207\slmult0 \par\pard\ql\li10560\sb0\sl-207\slmult0 \par\pard\ql\li10560\sb0\sl-207\slmult0 \par\pard\ql\li10560\sb0\sl-207\slmult0 \par\pard\ql\li10560\sb0\sl-207\slmult0 \par\pard\ql\li10560\sb0\sl-207\slmult0 \par\pard\ql\li10560\sb0\sl-207\slmult0 \par\pard\ql\li10560\sb106\sl-207\slmult0 \up0 \expndtw0\charscalex159 \ul0\nosupersub\cf8\f9\fs18 /10 \par\pard\ql \li2260\sb0\sl-207\slmult0 \par\pard\ql\li2260\sb0\sl-207\slmult0 \par\pard\ql\li2260\sb0\sl-207\slmult0 \par\pard\ql\li2260\sb12\sl-207\slmult0 \up0 \expndtw0\charscalex169 ciones coma los evaporados de la muestra). \par\pard\li4065\sb0\sl-207\slmult0\par\pard\li4065\sb0\sl-207\slmult0\par\pard\li4065\sb105\sl-207\slmult0\fi0\tx4852\tx5366 \up0 \expndtw0\charscalex100 TABLA\tab \up0 \expndtw0\charscalex127 2.\tab \up0 \expndtw0\charscalex127 \ul0\nosupersub\cf7\f8\fs18\ul Volumen de muestra amedir\par\pard\li4065\sb0\sl-207\slmult0\par\pard\li4065\sb0\sl-207\slmult0\par\pard\li4065\sb99\sl-207\slmult0\fi383\tx7291 \up0 \expndtw0\charscalex127 \ul0\nosupersub\cf8\f9\fs18 CONCENTRACION\tab \up0 \expndtw0\charscalex127 UOLUPIEN\par\pard\li4065\sb148\sl-207\slmult0\fi782\tx7435 \up0 \expndtw0\charscalex127 (mg/l)\tab \up0 \expndtw0\charscalex127 (ml)\par\pard\li4065\sb0\sl-230\slmult0\par\pard\li4065\sb149\sl-230\slmult0\fi3360 \up0 \expndtw0\charscalex127 \ul0\nosupersub\cf9\f10\fs20 1000\par\pard\li4065\sb0\sl-207\slmult0\par\pard\li4065\sb57\sl-207\slmult0\fi902\tx5207\tx5735\tx7550 \up0 \expndtw0\charscalex127 \ul0\nosupersub\cf8\f9\fs18 1\tab \up0 \expndtw0\charscalex120 -\tab \up0 \expndtw0\charscalex127 10\tab \up0 \expndtw0\charscalex127 100\par\pard\li4065\sb0\sl-207\slmu

lt0\par\pard\li4065\sb76\sl-207\slmult0\fi763\tx5203\tx5601\tx7675 \up0 \expndtw0\charscalex127 10\tab \up0 \expndtw0\charscalex120 -\tab \up0 \expndtw0\charscalex127 100\tab \up0 \expndtw0\charscalex127 10\par\pard\li4065\sb134\sl-230\slmult0\fi633\tx5198\tx5472\tx7800 \up0 \expndtw0\charscalex127 \ul0\nosupersub\cf9\f10\fs20 100\tab \up0 \expndtw0\charscalex120 -\tab \up0 \expndtw0\charscalex1271000\tab \up0 \expndtw0\charscalex127 1\par\pard\li2188\sb0\sl-207\slmult0\par\pard\li2188\sb0\sl-207\slmult0\par\pard\li2188\sb0\sl-207\slmult0\par\pard\li2188\sb0\sl-207\slmult0\par\pard\li2188\sb26\sl-207\slmult0\fi28\tx3383 \up0 \expndtw0\charscalex173 \ul0\nosupersub\cf8\f9\fs18 7.6.1.2\tab \dn3 \expndtw0\charscalex173 Se acidifica an presencia de anaranjado de metilo con aci-\par\pard\li2188\sb153\sl-207\slmult0\fi23\tx7660\tx7915 \up0 \expndtw0\charscalex173 do sulfurico concentrado, luego se agrega\tab \up0 \expndtw-2\charscalex100 5\tab \up0 \expndtw0\charscalex173 ml de acido nitrico con\par\pard\li2188\sb149\sl-207\slmul

t0\fi28\tx3643\tx3907\tx9475\tx9849 \up0 \expndtw0\charscalex166 centrado y\tab\up0 \expndtw-2\charscalex100 2\tab \up0 \expndtw0\charscalex170 ml de soluci6nde per6xido de hidr6geno al\tab \up0 \expndtw0\charscalex127 30\tab \up0 \expndtw0\charscalex173 %, para\par\pard\li2188\sb153\sl-207\slmult0\fi23 \up0 \expndtw0\charscalex173 reducir los cromatos. Se evapora en4baf1o de vapor a an planchade\par\pard\li2188\sb148\sl-207\slmult0\fi28\tx5855\tx6225\tx6489\tx6878 \up0 \expndtw0\charscalex170 calentamiento haste obtener\tab \up0 \expndtw0\charscalex119 15\tab \up0 \expndtw-2\charscalex100 a\tab \up0 \expndtw0\charscalex130 20\tab \up0 \expndtw0\charscalex173 ml cubriendo el envase con un\par\pard\li2188\sb153\sl-207\slmult0\fi23 \up0 \expndtw0\charscalex173 vidrio de reloj, cuando seanecesario, para evitar perdidas de mate\par\pard\li2188\sb148\sl-207\slmult0\fi23 \up0 \expndtw0\charscalex173 rial par salpicaduras. Puede colocarse una lampara infraroja sabre\par\pard\li2188\sb148\sl-207\slmult0\fi23 \up0 \expndtw0\chars

calex173 la muestra para acelerar la evaporaci6n.\par\pard\li2188\sb0\sl-207\slmult0\par\pard\li2188\sb61\sl-207\slmult0\fi14\tx3379 \up0 \expndtw0\charscalex173 7.6.1.3\tab \up0 \expndtw0\charscalex173 La soluci6n evaporada se transfiere junto con cualquier\par\pard\li2188\sb153\sl-207\slmult0\fi9\tx8947\tx9455 \up0 \expndtw0\charscalex173 s6lido remenente en la place, a un matraz c6nico de\tab \up0 \expndtw0\charscalex128 125\tab \up0 \expndtw0\charscalex173 ml. Se a-\par\pard\li2188\sb149\sl-207\slmult0\fi4\tx3110\tx3364 \up0 \expndtw0\charscalex152 gregan\tab \up0 \expndtw-2\charscalex100 5\tab \up0 \expndtw0\charscalex173 ml deacido nitrico concentrado que fue usado pare enjua-\par\pard\li2188\sb148\sl-207\slmult0\fi0\tx6215\tx6595 \up0 \expndtw0\charscalex173 gar la capsula de evapo

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raci6n;\tab \up0 \expndtw0\charscalex124 10\tab \up0 \expndtw0\charscalex173 mlde acido sulfurico concentra-\par\pard\qj \li2174\ri1255\sb24\sl-360\slmult0\fi14 \up0 \expndtw0\charscalex176 do; unas perlas de vidrio, astillas de carborundum a granulos Hen-\line \up0 \expndtw0\charscalex177 gar para minimizer la ebullici6n. Se evapora sabre una plancha de \line \up0 \expndtw0\charscalex170 calentamiento bajo campana de extracci3n,justo haste que aparezcan \line \up0 \expndtw0\charscalex167 an el matraz humos blancos densos de SO3, pero no debe continuarse \line \up0 \expndtw0\charscalex184 el calentamiento mas ally de este punto. Si'la soluci6n no as cla-\line \up0 \expndtw0\charscalex177 ra, se agregan \up0 \expndtw0\charscalex127 10 \up0 \expndtw0\charscalex180 ml de acido nitrico y se repite la evaporaci6n \par\pard\sect\sectd\fs24\paperw12240\paperh15840{\bkmkstart Pg14}{\bkmkend Pg14}\par\pard\ql \li10276\sb0\sl-207\slmult0 \par\pard\ql\li10276\sb0\sl-207\slmult0 \par\pard\ql\li10276\sb0\sl-207\slmult0 \par\pard\ql\li10276\sb0\sl-207\slmult0 \par\pard\ql\li10276\sb0\sl-207\slmult0 \par\pard\ql\li10276\sb0\sl-207\slmult0 \par\pard\ql\li10276\sb0\sl-207\slmult0 \par\pard\ql\li10276\sb0\sl-207\slmult0 \par\pard\ql\li10276\sb113\sl-207\slmult0 \up0 \expndtw0\charscalex145 \ul0\nosupersub\cf8\f9\fs18 /11 \par\pard\qj \li1977\sb0\sl-360\slmult0 \par\pard\qj\li1977\ri1333\sb167\sl-360\slmult0\fi14 \up0 \expndtw0\charscalex175 haste obtener humos de S03. Debe asegurarse que todo el acido nitri \up0\expndtw0\charscalex178 co ha sido eliminado, Como lo indica la claridad de lasoluci6n y la \up0 \expndtw0\charscalex166 ausencia de humos marrones an el matraz. \par\pard\li1982\sb0\sl-207\slmult0\par\pard\li1982\sb58\sl-207\slmult0\fi4\tx3153 \up0 \expndtw0\charscalex170 7.6.1.4\tab \dn2 \expndtw0\charscalex170 Seenfria a temperature ambiente y se diluye cuidadosamen-\par\pard\li1982\sb153\sl

-207\slmult0\fi0\tx3158\tx3547 \up0 \expndtw0\charscalex170 te haste\tab \up0 \expndtw0\charscalex127 50\tab \dn2 \expndtw0\charscalex170 ml aproximadamente conagua bidestilada. Se calienta\par\pard\ql \li1963\ri1335\sb35\sl-353\slmult0\fi14 \up0 \expndtw0\charscalex180 haste cerca del punto de ebullicion pars disolver lentamente las sa-\line \up0 \expndtw0\charscalex190 les solubles y se filtraa traves de un crisol filtro de porcelana \line \up0 \expndtw0\charscalex177 o vidrio sinterizado, a un matraz de filtraci6n cuidadosamente lim-\line \up0 \expndtw0\charscalex166 pio. \par\pard\li1905\sb0\sl-207\slmult0\par\pard\li1905\sb59\sl-207\slmult0\fi62\tx3134 \up0 \expndtw0\charscalex166 7.6.1.5\tab \dn2 \expndtw0\charscalex166 Se enjuaga el matraz de la muestra con dos porciones de\par\pard\li1905\sb148\sl-207\slmult0\fi57\tx2222 \up0 \expndtw-2\charscalex100 5\tab \dn2 \expndtw0\charscalex166 ml de agua bidestilada, pasandola a traves del crisol pars lavar\par\pard\li1905\sb158\sl-207\slmult0\fi57\tx5731 \up0 \expndtw0\cha

rscalex166 cualquier residuo del filtro\tab \up0 \expndtw0\charscalex166 (puedeusarse un dispositivo de filtra-\par\pard\li1905\sb139\sl-230\slmult0\fi48 \up0\expndtw0\charscalex166 \ul0\nosupersub\cf9\f10\fs20 cion que permita la recoleccion del filtrado directamente an un ma-\par\pard\li1905\sb144\sl-207\slmult0\fi62\tx4056\tx4560\tx5327 \up0 \expndtw0\charscalex166 \ul0\nosupersub\cf8\f9\fs18traz aforado de\tab \up0 \expndtw0\charscalex130 100\tab \up0 \expndtw0\charscalex166 ml).\tab \up0 \expndtw0\charscalex166 Se transfiere el filtrado a un matraz afo-\par\pard\li1905\sb129\sl-230\slmult0\fi52\tx3014\tx3527 \up0 \expndtw0\charscalex146 \ul0\nosupersub\cf9\f10\fs20 redo de\tab \up0 \expndtw0\charscalex118 100\tab \up0 \expndtw0\charscalex166 ml y se enjuaga el matraz de filtraci6ncon dos porcio-\par\pard\li1905\sb135\sl-230\slmult0\fi52\tx2870\tx3129 \up0 \expndtw0\charscalex145 nes de\tab \up0 \expndtw-2\charscalex100 5\tab \up0 \expndtw0\charscalex166 ml de ague bidestilada, agregando estos enjuagues al matraz\par

\pard\li1905\sb130\sl-230\slmult0\fi38\tx9993\tx10507 \up0 \expndtw0\charscalex163 aforado. Se diluye el contenido del matraz haste el aforo de\tab \up0 \expndtw0\charscalex118 100\tab \up0 \expndtw0\charscalex166 ml\par\pard\li1905\sb149\sl-207\slmult0\fi43 \up0 \expndtw0\charscalex166 \ul0\nosupersub\cf8\f9\fs18 y semezcla cuidadosamente. La solucion resultante as alrededor de\par\pard\li1905\sb129\sl-230\slmult0\fi43\tx2198 \up0 \expndtw-2\charscalex100 \ul0\nosupersub\cf9\f10\fs20 3\tab \up0 \expndtw0\charscalex166 N an acido sulfurico. Se toman porciones de ella pars la determi-\par\pard\li1905\sb149\sl-207\slmult0\fi38 \up0 \expndtw0\charscalex166 \ul0\nosupersub\cf8\f9\fs18 nacion de metales.\par\pard\li1905\sb0\sl-207\slmult0\par\pard\li1905\sb61\sl-207\slmult0\fi33\tx2841 \up0 \e

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xpndtw0\charscalex166 7.6.2\tab \dn2 \expndtw0\charscalex166 Si una muestra digerida se ha preparado de acuerdo a lo indi-\par\pard\li1905\sb158\sl-207\slmult0\fi28\tx2980\tx5443\tx5822\tx10228 \up0 \expndtw0\charscalex166 cado an\tab \up0\expndtw0\charscalex166 7.6.1, se pipetean\tab \up0 \expndtw0\charscalex121 10\tab \dn2 \expndtw0\charscalex166 ml u otra porcion qua contenga de\tab \up0 \expndtw0\charscalex166 20\par\pard\li1905\sb125\sl-230\slmult0\fi14\tx2183\tx2707\tx8030\tx8544\tx9187 \up0 \expndtw-2\charscalex100 \ul0\nosupersub\cf9\f10\fs20 a\tab \up0 \expndtw0\charscalex120 500\tab \up0 \expndtw0\charscalex149 /cug de Fean un embudo de separacion de\tab \up0 \expndtw0\charscalex113 125\tab \up0 \expndtw0\charscalex166 ml.\tab \dn2 \expndtw0\charscalex166 Si el volu-\par\pard\li1905\sb158\sl-207\slmult0\fi14\tx5054\tx5428 \up0 \expndtw0\charscalex153 \ul0\nosupersub\cf8\f9\fs18 men tomando as manor de\tab \up0 \expndtw0\charscalex11910\tab \dn2 \expndtw0\charscalex166 ml se adiciona agua destilada haste obte-\par\pard\li1905\sb148\sl-207\slmult0\fi14\tx2443\tx2832\tx3484\tx8673\tx9052 \up0\expndtw0\charscalex166 ner\tab \up0 \expndtw0\charscalex127 10\tab \up0 \expndtw0\charscalex166 ml.\tab \up0 \expndtw0\charscalex166 En el embudo de separacionse adicionan\tab \up0 \expndtw0\charscalex121 15\tab \up0 \expndtw0\charscalex166 ml de acido\par\pard\li1905\sb158\sl-207\slmult0\fi9\tx7502\tx7881 \up0 \expndtw0\charscalex166 clorhidrico concentrado pare un volumen de\tab \up0 \expndtw0\charscalex124 10\tab \up0 \expndtw0\charscalex166 ml, o si la porcion to\par\pard\li1905\sb148\sl-207\slmult0\fi0\tx4137\tx4512\tx6460\tx6604\tx6969 \up0 \expndtw0\charscalex155 made as mayor de\tab \up0 \expndtw0\charscalex121 10\tab \up0\expndtw0\charscalex166 ml, se agregan\tab \up0 \expndtw-4\charscalex100 1\tab\up0 \expndtw0\charscalex166 ,5\tab \up0 \expndtw0\charscalex166 ml de acido clo

rhidrico con-\par\pard\li1905\sb168\sl-207\slmult0\fi0 \up0 \expndtw0\charscalex166 centrado/ml de muestra. Se mezcla, se enfria y se procede Como se\par\pard\li1905\sb138\sl-207\slmult0\fi4\tx3211 \up0 \expndtw0\charscalex166 indica an\tab\up0 \expndtw0\charscalex166 7.6.4.\par\pard\sect\sectd\fs24\paperw12240\paperh15840{\bkmkstart Pg15}{\bkmkend Pg15}\par\pard\ql \li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb0\sl-207\slmult0 \par\pard\ql\li10468\sb166\sl-207\slmult0 \up0 \expndtw0\charscalex155 \ul0\nosupersub\cf8\f9\fs18 /12 \par\pard\li2111\sb0\sl-207\slmult0\par\pard\li2111\sb0\sl-207\slmult0\par\pard\li2111\sb146\sl-207\slmult0\fi48\tx3067 \up0 \expndtw0\charscalex173 7.6.3\tab \up0 \expndtw0\charscalex173 Para preparar una muestra solam

ente Para determiner hierro,\par\pard\li2111\sb158\sl-207\slmult0\fi38\tx7852\tx8232\tx8500 \up0 \expndtw0\charscalex160 se mide un volumen adecuado que contenga de\tab \up0 \expndtw0\charscalex127 20\tab \up0 \expndtw-2\charscalex100 a\tab\dn2 \expndtw0\charscalex173 500 /%'g de Fe y se\par\pard\li2111\sb153\sl-207\slmult0\fi38\tx5520\tx6547 \up0 \expndtw0\charscalex173 digiere coma se indica en\tab \up0 \expndtw0\charscalex173 7.6.1.\tab \up0 \expndtw0\charscalex173 Sin embargo debe usarse solamente\par\pard\li2111\sb143\sl-207\slmult0\fi33\tx2404 \up0 \expndtw-2\charscalex100 5\tab \up0 \expndtw0\charscalex173 ml de acido sulfurico y omitirse el use de per6xido de hidrogeno.\par\pard\li2111\sb167\sl-207\slmult0\fi28\tx5385\tx6686\tx10051\tx10430 \up0 \expndtw0\charscalex173 Cuando la digestion est6\tab \up0 \expndtw0\charscalex173 complete\tab \dn2 \expndtw0\charscalex173 (se enfria, se diluye con\tab \up0 \expndtw0\charscalex121 10\tab \up0\expndtw0\charscalex173 ml\par\pard\li2111\sb158\sl-207\slmult0\fi28 \up0 \expnd

tw0\charscalex173 de agua destilada),se calienta casi a ebullicion Para disolverlen-\par\pard\li2111\sb153\sl-207\slmult0\fi24 \up0 \expndtw0\charscalex173 tamente sales solubles y si la muestra esta todavia opaca, se fil-\par\pard\li2111\sb153\sl-207\slmult0\fi24\tx10425 \dn2 \expndtw0\charscalex173 tra a trav6s de fibre de vidrio, vidrio sinterizado o filtro de\tab \up0 \expndtw0\charscalex120-\par\pard\li2111\sb153\sl-207\slmult0\fi14\tx5116\tx5366\tx5630\tx5884 \dn2 \expndtw0\charscalex167 porcelana, lavando con\tab \up0 \expndtw-2\charscalex100 2\tab \up0 \expndtw-2\charscalex100 a\tab \up0 \expndtw-2\charscalex100 3\tab \dn2\expndtw0\charscalex173 ml de agua destilada.\par\pard\li2111\sb0\sl-207\slmult0\par\pard\li2111\sb61\sl-207\slmult0\fi14\tx3287 \up0 \expndtw0\charscalex173 7

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.6.3.1\tab \dn2 \expndtw0\charscalex173 Se transfiere cuantitativamente el filtrado o la solucion\par\pard\li2111\sb153\sl-207\slmult0\fi9\tx5884\tx6268 \up0 \expndtw0\charscalex173 clara a un matraz aforado de\tab \up0 \expndtw0\charscalex124 25\tab \dn2 \expndtw0\charscalex173 ml y se diluye hasta el aforo con\par\pard\li2111\sb153\sl-207\slmult0\fi0 \up0 \expndtw0\charscalex173 ague destilada.Se vacla el matraz en un embudo de separacion, de\par\pard\li2111\sb149\sl-207\slmult0\fi19\tx2640\tx5112\tx5361 \up0 \expndtw0\charscalex126 125\tab \up0 \expndtw0\charscalex173 ml, se enjuaga con\tab \up0 \expndtw-2\charscalex100 5\tab \up0 \expndtw0\charscalex173 ml de acido clorhidrico concentrado que\par\pard\li2111\sb153\sl-207\slmult0\fi9\tx6268\tx6652 \up0 \expndtw0\charscalex166 se agregaal embudo y as anaden\tab \up0 \expndtw0\charscalex124 25\tab \up0 \expndtw0\charscalex173 ml de acido clorhidrico concen-\par\pard\li2111\sb153\sl-207\slmult0\fi14 \up0 \expndtw0\charscalex173 trado medido con el mismo matraz. Se mezcla yse enfria a tempera\par\pard\li2111\sb129\sl-230\slmult0\fi9 \up0 \expndtw0\charscalex173 \ul0\nosupersub\cf9\f10\fs20 tura ambiente.\par\pard\li2111\sb0\sl-230\slmult0\par\pard\li2111\sb15\sl-230\slmult0\fi9\tx3023 \up0 \expndtw0\charscalex173 7.6.4\tab \up0 \expndtw0\charscalex173 \ul0\nosupersub\cf8\f9\fs18 Se extrae-.el hierro de la solucion de acido clorhidrico en\par\pard\li2111\sb149\sl-207\slmult0\fi0\tx7166\tx7555\tx8332\tx8721 \dn2 \expndtw0\charscalex167 el embudode separacion agitandolo por\tab \dn2 \expndtw0\charscalex129 30\tab \dn2 \expndtw0\charscalex173 s con\tab \up0 \expndtw0\charscalex127 25\tab \dn2 \expndtw0\charscalex173 ml de titer iso-\par\pard\qj \li2102\ri1451\sb42\sl-340\slmult0\fi4 \up0 \expndtw0\charscalex177 propilico. Se transfiere la capa acida a un segundo embudo de ser, \line \up0 \expndtw0\charscalex178 paracion. Se extrae de nuev

o la solucion acida con \up0 \expndtw0\charscalex124 25 \up0 \expndtw0\charscalex152 \ul0\nosupersub\cf9\f10\fs20 ml de titer \par\pard\ql \li2088\ri1341\sb10\sl-353\slmult0\fi14 \up0 \expndtw0\charscalex181 \ul0\nosupersub\cf8\f9\fs18 isopropilico, se drena la caps acida en un recipients limpio apro-\line \up0 \expndtw0\charscalex178 piado y se combinan las dos porciones de titer isopropilico. Se\line \up0 \expndtw0\charscalex175 vierte la caps acids en el segundo embudo deseparaci6n y se extras \line \dn2 \expndtw0\charscalex160 una vez mss con \up0\expndtw0\charscalex127 25 \dn2 \expndtw0\charscalex176 ml de titer isopropilico. Se decanta y se descar \par\pard\ql \li2092\sb148\sl-207\slmult0 \up0 \expndtw0\charscalex183 to la capa acida y entonces se agrega la caps de titer a las otras \par\pard\ql \li2083\sb153\sl-207\slmult0 \up0 \expndtw0\charscalex177 capesen el embudo de separacion original. La persistencia de un \par\pard\ql \li2083\sb153\sl-207\slmult0 \up0 \expndtw0\charscalex177 color amarillo en la solucion

de acido clorhidrico despue's de las \par\pard\qj \li2068\ri1245\sb27\sl-360\slmult0\fi14 \up0 \expndtw0\charscalex178 tres extracciones no significa una separacion incomplete del hierro, \up0 \expndtw0\charscalex178 debido a que el cobra,el cual no he sido extraido, da un color ama \up0 \expndtw0\charscalex179 rillosimilar. \par\pard\sect\sectd\fs24\paperw12240\paperh15840{\bkmkstart Pg16}{\bkmkend Pg16}\par\pard\ql \li10324\sb0\sl-207\slmult0 \par\pard\ql\li10324\sb0\sl-207\slmult0 \par\pard\ql\li10324\sb0\sl-207\slmult0 \par\pard\ql\li10324\sb0\sl-207\slmult0 \par\pard\ql\li10324\sb0\sl-207\slmult0 \par\pard\ql\li10324\sb0\sl-207\slmult0 \par\pard\ql\li10324\sb0\sl-207\slmult0 \par\pard\ql\li10324\sb0\sl-207\slmult0 \par\pard\ql\li10324\sb173\sl-207\slmult0 \up0 \expndtw0\charscalex155 \ul0\nosupersub\cf8\f9\fs18 /13 \par\pard\li2121\sb0\sl-207\slmult0\par\pard\li2121\sb0\sl-207\slmult0\par\pard\li2121\sb0\sl-207\slmult0\par\pard\li2121\sb33\sl-207\slmult0\fi33\tx3321\tx9412\tx9801 \dn2 \expndtw0\charscalex170 7.6.4.1\t

ab \dn2 \expndtw0\charscalex170 Se agitan los extractos etereos combinados con\tab \up0 \expndtw0\charscalex127 25\tab \up0 \expndtw0\charscalex170 ml de\par\pard\li2121\sb158\sl-207\slmult0\fi23 \up0 \expndtw0\charscalex170 ague destiladapars retornar el hierro a la Ease acuosa y transfe-\par\pard\li2121\sb158\sl-207\slmult0\fi28\tx8769\tx9273\tx9916 \up0 \expndtw0\charscalex170 rir la capa acuosa inferior a un matraz aforado de\tab \up0 \expndtw0\charscalex128 100\tab \up0\expndtw0\charscalex170 ml.\tab \up0 \expndtw0\charscalex170 Se re-\par\pard\li2121\sb153\sl-207\slmult0\fi23\tx8102\tx8495 \up0 \expndtw0\charscalex170 pite la extracci6n con una segunda porcion de\tab \up0 \expndtw0\charscalex127 25\tab\up0 \expndtw0\charscalex170 ml de agua destila\par\pard\li2121\sb158\sl-207\slm

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ult0\fi23 \up0 \expndtw0\charscalex170 do, agregando este el primer extracto acuoso. Se descarta la caps\par\pard\li2121\sb134\sl-230\slmult0\fi19 \up0 \expndtw0\charscalex170 \ul0\nosupersub\cf9\f10\fs20