is 4344 (1978): endosulfan, technicalisi 4344. 1978 indian standard' specification for...

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Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. इंटरनेट मानक !ान $ एक न’ भारत का +नम-णSatyanarayan Gangaram Pitroda “Invent a New India Using Knowledge” प0रा1 को छोड न’ 5 तरफJawaharlal Nehru “Step Out From the Old to the New” जान1 का अ+धकार, जी1 का अ+धकारMazdoor Kisan Shakti Sangathan “The Right to Information, The Right to Live” !ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह Bharthari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 4344 (1978): Endosulfan, Technical [FAD 1: Pesticides and Pesticides Residue Analysis]

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Page 1: IS 4344 (1978): Endosulfan, TechnicalISI 4344. 1978 Indian Standard' SPECIFICATION FOR ENDOSlJLFAN, TECHNICAL ( First Revision) o. FOREWORD 0.1 This Indian Standard (First Revision)

Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 4344 (1978): Endosulfan, Technical [FAD 1: Pesticidesand Pesticides Residue Analysis]

Page 2: IS 4344 (1978): Endosulfan, TechnicalISI 4344. 1978 Indian Standard' SPECIFICATION FOR ENDOSlJLFAN, TECHNICAL ( First Revision) o. FOREWORD 0.1 This Indian Standard (First Revision)
Page 3: IS 4344 (1978): Endosulfan, TechnicalISI 4344. 1978 Indian Standard' SPECIFICATION FOR ENDOSlJLFAN, TECHNICAL ( First Revision) o. FOREWORD 0.1 This Indian Standard (First Revision)
Page 4: IS 4344 (1978): Endosulfan, TechnicalISI 4344. 1978 Indian Standard' SPECIFICATION FOR ENDOSlJLFAN, TECHNICAL ( First Revision) o. FOREWORD 0.1 This Indian Standard (First Revision)

Indian StandardSPECIFICATION FOR

ENDOSULFAN, TECHNICAL

( First Revision)

Third Reprint MAY 1993

UDC 632.951 END

IS I 43... • 1978( Reaffirmed 2002

Gr 3

@ Copyright J~78

BUREAU OP INDIAN STANDARDSMANAK BRAVAN. 9 BAHADUR SHAH ZAPAR MAllO

NEW DELHI 110002

MQY 1978

Page 5: IS 4344 (1978): Endosulfan, TechnicalISI 4344. 1978 Indian Standard' SPECIFICATION FOR ENDOSlJLFAN, TECHNICAL ( First Revision) o. FOREWORD 0.1 This Indian Standard (First Revision)

IS I 4344 • 191i

Indian StandardSPECIFICATION FOR

ENDOSULFAN, TECHNICAL

( First Revision)

Pest Control Sectional Committee, AFCDC 6

CluJirmtJnDR S. N. BANBRJltE

Re/W'u"tin,Directorate of Plant Prcteerion, Quarantine at

Storage (Mini.try of Agriculture & Irriga­tion ), Faridabad

( CQntinwtlOil tap 2 )

Department of Alriculture, Government of UttarPradesh, Lucknow

DnUTY DlBJ:OTOB ( PLAlfTPBOTEC'l ION ) .( Allmtllt, )

MnnlHrsDB N. S. AOARWAL

Pesticides lusociation of India, New DelhiCentral Forensic Science Laboratory, Central

Bureau of Investigation, New DelhiPesticides Formulators Association of India

( s. s. I. ), BombayAlkali" Chemical Corporation of India Limited,

CalcuttaDB T. V. RAOHURAMAN ( Altmtdl,)

DR A. K. BHATNAOAB. Hindustan Insecticides Limited, New DelhiS RBI C. C. ABBAHAM ( Alt"nal,)

SKBt V. G. D••HPANDB Ciba-Ge;gy of India Limited, BombaySRBI E. A. ALarBIDA. ( Altmuu, )

SSBI O. P. D1LUU1~ Export Inspection Council of India, New Delhi8111\1 P. K. CBA'rTB:anm ( AltmuJll )

DB M. S. DIUTT National Malaria Eradication Programme, DelhiDIBBeTo. CBlIfEBAL A R II B D Directorate General of Armed Forces Medical

FOReBa MEDICAL SIDRVICE8 Services ( Ministry of Defence )J New Delhia.....·ADIII.,u, M. S. M'ALBOTRA

( ~lt"""'" )DIRECTOR 0 .. AOBJCULTU.K

DB S. R. BABOOAH

DR N. K. BA8U

Department of Food (Ministry of ABriculture&t Irrigation ), New Delhi

DB K. KSI8HlfAMUBTHY ( AI/I1Mt, )DB P. !'I. AOARWAL Ministry of Defence ( R&D)

DR N. P. RA.o ( Alltrraal, )SHBI H. S. BA.HLDB H. L. BA.llI

<i) ~.,,,, 1978BUREAU OF INDIAN STANDARDS

This publication is protected under the I,.d•• eo"n,'" Ad (XIV of 1957) andreproduction in whole or in part by any meana except with written permislion of thepubliJber shall be deemed to be an in(riDlemeat of copyript unclei' the said Act.

Page 6: IS 4344 (1978): Endosulfan, TechnicalISI 4344. 1978 Indian Standard' SPECIFICATION FOR ENDOSlJLFAN, TECHNICAL ( First Revision) o. FOREWORD 0.1 This Indian Standard (First Revision)

IS J 4344 • 1978

( C(",li,wedjrom """ I )

AlnnHrsDu "f:~ CONTrtOI.I.En ( INDIA)

R,p"s,ntangIndian Pharmacopoeia Committee ( !\fini~try of

Health & Family Welfare ). Now De lhi

Indian Institute of Sugarc.ane Research ( ICAH. ),Lucknow

SHIll M. RAVIKI\NT ( Alt,rnQt~)

SHIU G. D. GOKHAl....; Bomhay Chern ica ls Private Limited, BombaySHIH V. V. KP;'CXAR ( AI'n-natl)

JOIN'l' DUtl':t'1.'OH OF AORICUI.TURE Department of Agriculture, Government( DEvELop~n:NT & ICP) Karnataka, M ysore

DJl:PUTY DIRECTOlt OF AORICULTUHJ<:( PLANT PIH1'rJi:CTtoN ) ( Alttr1l/J{e )

nit R. L. KALltA Punjab Agricultural University J Lud h ianar». R. P. CU.-\\VT.A (Altn-nale)

DM. KJ9HAN Srxn n

of

DR S. C. S1tlVABTAVA ( A.ltnnau )5MBJ S. G. KRISHNAN National Organic Chemical Industries Limited,

Bombay

( CSIR),Laboratory

Bhara t Pulverising Mills Private Limited,Bom ba v

Central Food Technological Research Institute( CSI R ), Mysore

Cyanamid India Limited, Bombay

Agricuf t-rral Chemicals Division, Indian Agricul­tural Research Institute ( ICAR ), New Dt:'Jhi

DR K. D. SHAMMA

DI~ K. S. SISON

Ccnt . al Inscct icidcs Hoard, Drrr-c torntr- of PlantProtection, Quarantine & Storage ( Ministryof .\griculture & Irrigation ). Faridabad

I)H S. Y. P"NIJJT Bayer ( India) Limited, BombaySH fU D. ;'\l. NAAHATE ( Alternate )

DII T. N. PAH'rHA8.AltATHY Regional ResearchHyderabad

Depar t ment of .'\griculture, Govcrnrnvrn ofGujarat ... \hmadabad

Su nr Y, A. PNADHAN Rail is India Limited, BombayDR Z. .J. KAP.-\DIA ( Alternate ) . .

Dn F, R_\lt~I.-\N Tea Research Association, CalcuttaUn G. SA"l'Y.\SARAY.\N.\ ( Alternate ;

StUll G. K. R.-\o Mi'nisrr v of Defence ( DGI )DR A. K. SJ.l:S ( Alternate )

SHill K. R. lXAl(AY.\NA" RAO Food Corporation of India, New DelhiS)IT K. K. M. BH.'VN-\.NI ( Altemate )

DR RATTAN LAL Entomology Divisioni

Indian Agricultural Re..searc h Institute ( C ...\R), !\ew Delhi

Directorate General of Technical Development,New Delhi

Indian Veterinary Research Institute (leAR),Izatnagar

SUItI S. CHAT'rl4:nJI ( Alternate )])lL A. L. ~100I\:J';IlJEJ~

SHUI]. P. PAnlKH (.llle,nall)Un S. K. ~hTJ\EnJF.l';

SHJlI M. MtJTHU (AltnNJI.)SHU 1 K. S. l\rJ.:HTA

I) h N. K. Rov ( (fl ternate )1) II K. D. P.\ H ~\ Ie rA

Sffl:l 1\1. .\. P.\TEL

DR J. S. \,'t:R~fA ( Alternate)SMJU S. K. MAJUMDAR

S.tflCl S. C. SRl\·.-\ST.AX.\ ( Alternat« )( Coralirru,d Dn /Jtll' 8 )

2

Page 7: IS 4344 (1978): Endosulfan, TechnicalISI 4344. 1978 Indian Standard' SPECIFICATION FOR ENDOSlJLFAN, TECHNICAL ( First Revision) o. FOREWORD 0.1 This Indian Standard (First Revision)

SHKIT.PURNANANDAM,Deputy Director ( Agri & Food)

IS I 4344 • 1978

( COIII;""ufrom /Ja" 2 )

MmllNTs Rf.P'tj~"li',g

SaBI K, VENKA'r,\CliJ\L,\~1 Dcpar t.ncnt of ,\grlC\1lture. Cov('rnnlf>lll ofArulhra Pradesh, Hyclcrabud

SHRI K. SATYANARANA RAO ( Alt~'1UJ16 )SHill N. S. VENXATARAliAN Depur t mrnt of AgricuJtltrf', (~ovl('rnJllenl of

'rami! NaduDR P. R. VENKATESWAllAN Union Carbide India Li mitcd , New Dr-Ih i

Dn K. N. SUJUVA8T.\.VA ( Altmuzl,)SHIU N. G. WAGLE • Pest Control ( India) Private Li rn it cd , Bornbay

SURI M. R. BAJIJCAR ( AlternGt, )Da B. L. WATTAL National Iusritutc of Cornrnu nicable Diseases,

DelhiDirector G('ncra 1, BIS ( E\-njficio Mnnb" J

&c,darySHill LAJINDER SINon

Assistant Director ( Agri & f'ood J, DIS

Pesticides Subcommittee, AFCDC 6: 1

ConlJtnn

DR K. D. PAlfARIA Central Insectic ides Hoa rcl , !Jirl'('lori.l" flI" Pl~&nt

Protection. Qlarantint: & SlfJr;lgl' ( ~'lini,·

try of Agricu lrur« & lrrig;u lUll ). I;a.ridiJbad

DR. N. K. BA8U

Mmrbns

Os N. S. AOARWAL lJepartment of Food ( Miniatr y uf .\griC:ll1ture &Irrigation L New DC!lhi

DR K. KKISH.NAMUll'l'HY ( AllnJUlu )SH.RI E. A. ALMEIDA Ciba.G~igy of India Limited, IJolllh;\)Da H. L. BAMI Central Forensic Sc ience Laboraturv, Central

Bureau of Investigation, New Ilf;1tliAlkali &. Chemical Corpcrarion of India Limited,

CalcuttaOa A. P. DUTTA ( AltlNUJt, )

Da A. K. BHATM,AOAR Hindustan Insccricjdcs Lirni ted , :\cw Dc lh iSa.Rl C. C. AUR.A.HAM ( Alllt'NlU )

Da N. F. DE8A.l Sandoz ( India) Limited, ThanaD. P. S. PHADE. ( Allmlll'. )

D. M. S. DIUT'l' National Malaria Eradication Programme, DelhiSHJlI G. D. GoKHALE Bombay Chemicals Private Limited, Bombay

SHal V. V. KBTKAD. (AIUmilI')Da KALY.6..k SDftlH U. P. Institute of Agricultural Scienccs , KanpurSa·al 1<.. S. MIIHTA Bharat Pulverising Mills Private Limjtcd ,

BombaySaRI S. CBATTEBJ I ( AltlF",," J

( ClJ1IJUlUld onpa" !J )

8

Page 8: IS 4344 (1978): Endosulfan, TechnicalISI 4344. 1978 Indian Standard' SPECIFICATION FOR ENDOSlJLFAN, TECHNICAL ( First Revision) o. FOREWORD 0.1 This Indian Standard (First Revision)

IS 1 4:444 • 1978

(G'o,,'inucd)'0111 ~lgt 1 )

MemberJS .. ,.., J.. S. M IfnI"~:

J )1: S. J". ~I' 1'lu·;n.n:I':

R,pr'~mlir&J

Agromore Limited, BangaloreAgricultural Chemicals Division, Indian Agri·

cultural Research Institute (leAR), NewDelhi

(CSIR ),Laboratory

Centra] Revenue. Control Laboratory (Ministryof Finance), New Delhi

S II It I (~. )) 11.\ IC\I\ R.-\o Pesticides Testing Laboratory. HyderabadSUlCI D. X. V. R ..\O ' 'rata Chemicals Limited, Mithapur

SIInl C. NI'~";"K,,\N"'JI_\~ (Al',.-,nfJle)Du K. K. S.\:\: ":N \ Inuofil Chemicals Limited, Bombay

SUI" (;. N.\'.".\H.\.f.\N ( Allum",)s ...:, .\. (:, S'tt,Ol"'" Excel Industries Limited, Bombay

S It It I P. V. K \ Nun ( .)lI,·"lIlllj )S'itH K. S,' N It.\ It.,)l Hiudustan Petrol cum Corporation Limited,

Bomba)'

nit N. K. Roy ( All,rnat,)l)u S. Y. PANfH'r Bayer (India) Lim itod, Bombay

S 111\1 J). N. NAKllA'rE ( AlterMI, )Du '1'. N. PAU.'I'IL'~,\HATJl y R~gional Research

HyderabadP',.\~"· l'uo"'~t'''''I)N ADV]s}<~n 'J'f) Directorate of Plant Protection, Quarantine It

"'IU: (;OV1~ltNJ\-"';N'" of INDIA Storage (Ministry of Agriculture at Irriga­tion ), Faridabad

n« V. J..J\KHU1\()NAItAYAl-iA ( AltnTuJt,)Sill:' Y. A. PU.\IHIAN Rallis India Limited, Bombay

S" HI ~l. L, SU,\U ( Alternat« )1)1: v, S, ){,\ l'f" N ,\'I'Jl1\1(

S n n r u, R ..\JMJ\SI ( Alternate )~"lCt 1\;, S. \'·':}l;).;;O\'I'A1LAMAf'l,

Du U. J.. '''',\'rT,\ f.

Pest ir idvs 'Test in~ Laboratory, Kovilpntt iNationnf I n!titlt tc of ConJmun;cabJff Diseases,

Delhi

9

Page 9: IS 4344 (1978): Endosulfan, TechnicalISI 4344. 1978 Indian Standard' SPECIFICATION FOR ENDOSlJLFAN, TECHNICAL ( First Revision) o. FOREWORD 0.1 This Indian Standard (First Revision)

IS I 4344. 1978

Indian Standard'

SPECIFICATION FORENDOSlJLFAN, TECHNICAL

( First Revision)

o. FOREWORD

0.1 This Indian Standard (First Revision) was adopted by the IndianStandards Institution on 15 February 1978, after the draft finalize d by thePest Control Sectional Committee had been approved by the Agriculturaland Food Products Division Council and the Chemical Division Council.0.2 Endosulfan is a non-systemic and stomach insecticide and is effectiveagainst. agricultural and household insectsjpests,0.3 This standard was first publ ished in 1967. Subsequently AmendmentNo. 1 was issued, In the first revision the packaging, sampling and.cautionary notice requirements had be en modified. Opportunity has beentaken to refer IS: 6940 ... 1973· to bring uniformity in testing procedure{or the various requirernents given in the standard.0.4 EndosuJfan is the accepted common name by the International Orga­nization for Standardization (ISO) for the insecticidal chemical 6, 7,8. 9, 10, lO-hexachloro-l, 5, Sa, 6, 9. 9a-hexahydro-6, 9..methane..2, 4,3-benzo [e]-di<1xathiepin 3-oxide. The empirical anti structural formulaeand the molecular mass of endosulfan are as indicated below:Empirical Formula Siruct""al Formula Mol(c"lar Mass

. CI H

/c,1a-c I C-CH2-o,

C.H.CI.OaS II CCla I 5=0 406-95

Cl-C,!/,-CHZ-o/Ct.. .

0.5 In the preparation of this standard, due consideration has been givento the provisions vof the Insecticides Act, 1968 and the Rules frame dthereunder. However. this standard is subject to the rertrictions imposedunder these, wherever applicable,

• Methodl of telts for pesticides and their formulations.

3

Page 10: IS 4344 (1978): Endosulfan, TechnicalISI 4344. 1978 Indian Standard' SPECIFICATION FOR ENDOSlJLFAN, TECHNICAL ( First Revision) o. FOREWORD 0.1 This Indian Standard (First Revision)

IS I 4344 - 1978

0.6 For the purpose of deciding whether a particular requirement of thisstandard i~ complied with. the final value, observed or calculated, express­ing the result of a test or analysis, shall be rounded off in"accordance withIS: 2·1960·. The number of significant places retained in the rounded offvalue should be the same as that of the specified value in this standard.

1. SCOPE

1.1 This standard prescribes the requirements and the methods ofsampling and test for cndosulfan, technical.

2. REQ,UIREMENTS

2.1 DHcripdoD -- Endosulfan, technical shall be in the form of light todark brown solid and shall be free from foreign matter or added modifyingagent(s) .

2.2 The material shall also comply with the requirements given inTable 1.

TABLE 1 REQUIREMENTS FOR ENDOSULFAN, TECHNICAL

s., <':' •.\ItAC1'Jr.UISTll' RY.QUIU. ..;MKNT MY-TUOD 0.· TP:8T) n.t;1" TONo. r----- ..---..A-.-----~

Appendix of Cl No. ofThis Standard IS: 6940... 1973·

( 1) (2) (3) (4) (5)

i) Act ivo inl{redient content) 90 Apercent by mas-s, Min

ii) Moisture content, percent 0·1 4-by mass, AfGX

iii) Material insoluble in ace- 1·0 9tone. percent by mass,4\1"

iv ) Acidity ( as "2S0. ). per- 0·1 11.3cent by 'Has" It-IG:\:

·M("thod~ ortests for pesticides and thrir for mulat ions.

3. PACKING AND MARKING

3.1 Paeld•• - The material shall be packed according to IS: 8190 .( Part I )-1976t.

·Rult'A for rounding off numerical values ( recised },tRequir("lnent, for p"ckin~ orpPlticid~.: Part I Solid pesticides.

4

Page 11: IS 4344 (1978): Endosulfan, TechnicalISI 4344. 1978 Indian Standard' SPECIFICATION FOR ENDOSlJLFAN, TECHNICAL ( First Revision) o. FOREWORD 0.1 This Indian Standard (First Revision)

IS.OH.lt71

3.2 Marilla. - The container shall bear legibly and indelibly the follow­ing inrormJ.tion and any other information as is necessary under theInsecticides Act and Rules:

a) Name of the material;b) Name of the manufacturer;c) Batch number;d) Dat~ of manufacture;e) Active ingredient content, percent ( mlm );C) Net mass of contents; andg) The minimum cautionary notice worded as in the Insecticides

Act and Rules.

3.2.1 When packed in bags, the pictorial marking for • USE NOHOOKS. DO NOT PUNCTURE' as contained in IS : 1260 ( Part II )­1973* shall be stencilled on the bags.

3.2.2 Each container may also be marked with the Standard Mark

NOTS - The use of the Standard Mark is lavernecl by the proviuou of theBureau of IndiaD Sraadards Act, 1986 and the Rules aDd RelulatioDs nwlo there­under. The Staadard Mark on products covered by aD IDdiaD StaDdard CODveysthe assurance that they bave been produced to comply with the requirements of -thatstandard under a well defined sYltem or inspection. tettin. and quaBty coatrolwhich .. deviloct and luperviled by DIS and operated by the producer. StaDdarclmarked products are also continuously checked by DIS IQr conformity to thatltaaclard as a further safeauard. Details or conditioal under which • JlceDce forthe use of tho Standard Mark may be aranted to manuractuten or producers ma,be obtained from the Bureau of Indian Standa.rdl.

f.8AMPUNGf.l Representative samples of the material shall be drawn as prescribedin C Indian Standard methods for sampling of pesticides and their formula..tions (untili' P"PIl,Qlioll ).

NOTE - Till such time the Itandard under preparation fa published, the ..atterthall be .. agreed co between the concerned parde•.

5. TESTS5.1 Tests shall be carried out by the appropriate methods referred to incol 4 and 5 of Table I.5.2 Q,aaUty 01 Re••eat. - Unless specified otherwise, pure chemicalsand distilled water (I" IS: l070-1977t) shall be employed in the tests.

NOTE - C Pure chemica" t .hall mean chemicals that do not contain impuritieswhich a8'ect the results of analYlb.

·Pictorial marklng for h'lndUng and labellinl of good.: Part 11 General good.(first r,rtisioft).

fSpecification for water for general laboratory use ( ueotUJ ,,,,;,n.,, ).

Page 12: IS 4344 (1978): Endosulfan, TechnicalISI 4344. 1978 Indian Standard' SPECIFICATION FOR ENDOSlJLFAN, TECHNICAL ( First Revision) o. FOREWORD 0.1 This Indian Standard (First Revision)

IS I 4344 • 1978

APPENDIX A[Table I, SI No. (i) ]

DETERMINATION OF THE ACTIVE INGREDIENT

A-I. PRINCIPLE OF THE METHOD

A-I.I The principle, in determination of the active ingredient of endosul­fan, namely, 6, 7, 8, 9, 10, lO-hexachloro-l J 5, 5a, 6, 9, 9a-hexahydro-6,9-methano-2, 4. 3-benzo [ ~ ]-dioxathiepin 3';oxide, is based on hydrolysisof endosuJfan with methanolic sodium hydroxide and estimating thesodium sulphite ( Na,SOa) so formed iodornetrically,

A-2. REAGENTS

A-2.1 M.thaDol

A-2.2 SocIi1llD Hydroxide - pellets.

A-2.3 Phellolphtbaleia ladie.tor SolutioD - one percent (m/v) inrectified spirit.

A-2.4 Staaclard Sulphuric Acid - 5 N.

A-2.5 Staadard Iodine SolutioD '- 0·1 N.

A-2.6 StaDdarcl SocHam Thio8.lphate Solutio. - 0·1 N.

A-2.7 Starch SolutioD -0'2 percent, freshly prepared.

A-3.PROCEDUREA-3.1 Weigh accurately about 0·5 g of the material and transfer it to a250-ml flask. Add 100 ml of methanol by a pipette. Introduce about1·5 g of sodium hydroxide pellets (about 15 pellets). Connect the flaskto a reflux condenser and boil the contents at least for 2 hours. Shake theflask occasionally. Wash down the condenser with 20 ml of methanoland 50 mJ of distilled water. Add one drop of the phenolphthaleinindicator solution. Neutralize with standard sulphuric acid. Add a fewdrops of dilute sodium hydroxide to restore the indicator colour and toprevent any loss of sulphur dioxide.

A-3.2 For accurate determination of the sulphite, it is essential to add thesodium sulphite to an excess of acidified standard iodine solution and backtitrate the excess of iodine with standard sodium thiosulphate solution.

A-3.3 Take 40 ml of standard iodine solution in' a SOO-ml glass stopperedflask from a burette. Add 10-15 ml of the standard sulphuric acid to makesufficiently acidic and shake it slowly (set Note). 'Vhile agitating, add

6

Page 13: IS 4344 (1978): Endosulfan, TechnicalISI 4344. 1978 Indian Standard' SPECIFICATION FOR ENDOSlJLFAN, TECHNICAL ( First Revision) o. FOREWORD 0.1 This Indian Standard (First Revision)

IS I 4344 • 1~18

the aliquot containing sulphite solution... Rinse the flask well with smallportions of distilled water until all the sulphite has been transferred (thewashing procedure should be continued until there is insufficient sulphitein the flask to bleach a small drop of iodine). The final volume in theiodine flask should be about 225 to 250 ml.

NOTJI: - This process will have to be conducted in an evacuated flalk.

A-3.4 Back titrate the excess iodine; with the standard sodium thiosulphitesolution, using starch solution as indicator and titrate until the blue colourdisappears.

A-3.5 Carry out a blank determination by titrating 40 ml of the standardiodine solution to which "175 ml of water acidified with the same amountof standard sulphuric acid that has been added in the sample with standardsodium thiosulphate solution.

A-3.6 The difference in the volume of sodium thiosulphate solution indi­cates the iodine equivalent consumed by endosulfan.

A-4. CALCULAnON..&. ..4. 1 A' · di b V x 2·0353-". ctive mgre lent, percent y mass = kf

whereJ/ =-= volume of 0·1 N iodine solution as used in the test, andJ1 == mass in g of the sample taken for the test.

7

Page 14: IS 4344 (1978): Endosulfan, TechnicalISI 4344. 1978 Indian Standard' SPECIFICATION FOR ENDOSlJLFAN, TECHNICAL ( First Revision) o. FOREWORD 0.1 This Indian Standard (First Revision)

BURIAU OF INDIAN STANDAIIDS

H••dqu.".,. :Manak Shavan. 9 S.hadw Shah Zafar MarU. NEW DELHI 110002Teaephon.. : 331 01 31 Telegram. : Men.tunath.

331 13 75 (Common to III Offices)Region.' Office. :Centra' : Manak Shavan. 9. B.h~ur Shah Zafar Marg.

NEW DELHI 110002• e••tern : 1'14 C.tT. Scheme VII M.

V.J.P. Road, Manik.tol., CALCUTTA 700054Northern ; sco 445-446, Sector 35-C. CHANOIGARH 160038Southern : C.I.T. Campus, IV Cro.. Road, MADRAS 600113

t Weatern : Manakalaya. E9 MIDC. Marol. Andheri (E.,,),.BOMBAY 400093

Stench Offic•• :

'PuMpak', Nurmohamed Shaikh MarG. Khanpur, AHMADABAD 380001I Pe."ya Industrial Are., 1st Stag•. Bangalore-Tumkur Roed.

BANGALORE 580058Gangotri~omplex, 6th Floor, 8hadbhBda Road. 1.T. N-a.,

BHOPAL 462003Plot No. 82i83, Lewil Road, BHUBANESHWAR 751002Katai Kathir Building, 8/48-A Avanasi Road. COIM8ATORE 841037Quality Marking Centre. N·H. IV. N.I.T.. FARIDABAD 121001Savitri Complex. 116 G. T. Road. GHAZIABAO 20100153/6 Ward No. 29. R.G. Barue Road. 6th By-lane.

. GUWAHATI 7810036-8-56C L. N. Gupta Marg, ( Nampally Station Road)

HYDfRABAD 500001R14 YUdhister Marg. C Sche"",. J.AIPUR 302005 •117/418 B S.-vodaya Nagar, kANPUR 208006Plot No. A-9. Houa8 No. 561/63. Sindhu Neo.r. IMlPUr Roea

LUCICNOW 226005 I

Parliput,a Induatrial ESlate, PATNA 800013Oiatrtct Industries Centre Complex. Bagh-e-AU Mald.n.

SRINAGAR 190011T. C. No. 14/1421. University P.O•• Palayam.

nURUVANANTHAPURAM 695034In$p.ctiDn omo« (With Sale Point) :Pushpanjali. First Floor. 205-A West High Court Road.

Shankar Naga, Square. NAGPUR 440010Institution of Engines.s (India) Building. 1332 Shivaji Nag...

PUNE 411006

·Sal.. Office Calcutta is at 6 Chowringhee Approach.P. O. Princep Street, CALCUTTAt S.I.. Office f•• 81 Nove'ty Chamber•• Grant Road, BOMBAYS Sal... Office .........., Unity Building. Narasimharaja Square.8ANGALORE

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Reprolraphy Unit, BIS, New Delhi, Ind1a