authors: valentina petre, liliana ghita, razvan alexantdrescu, anamaria scarlat, radu ioana...
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AUTHORS: VALENTINA PETRE, LILIANA GHITA, RAZVAN ALEXANTDRESCU, ANAMARIA SCARLAT, RADU IOANA
TECHNICAL COLLEGE BUZAUCOMENIUS MULTILATERAL PARTNERSHIPLIFE-GIVING WATER INTERDISCIPLINARY APPROACH OF RESEARCH BUZAU RIVER BASIN ECOSYTEM Buzau River Water QualityThis project has been funded with support from the European Commission.This publication [communication] reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
Buzau River Water Quality
General Physico-chemical elements:Temperature conditions: temperature the oxygen: dissolved oxygen, CBO5, CCO-Cr, CCO-MnStatus acidification: pH, alkalinity, bicarbonates;Conditions of nutrients: N-NO3, N-NO2, N-NH4, Ntot, P-PO4, total P;salinity conditions: TDS, conductivity, Ca, Mg, Cl, hardness, SO4. Specific Pollutants: Cu, Zn, Cr, As, xylenes, PCBs (policlorbifenili), toluene, acenaphthene, phenols, detergents, and cyanide.
BUZAU RIVER ECOLOGICAL STATUSEcological status is an expression of the quality of the structure and functioning of aquatic ecosystems associated with surface waters. For surface water categories, the ecological status assessment is performed on five quality conditions, namely: high, good, moderate, poor and bad with the corresponding color code (blue, green, yellow, orange and red). The assessment of ecological status of surface waters is done using quality elements (biological, physicochemical, morphological).
DETERMINATION OF BUZAU WATER QUALITY3 water samples were taken from Buzau river, respectively from the following areas:PALTINENI- the mountainsMAGURA - the hillVADU PASII - the plain
DETERMINATION OF TEMPERATURE
Principle: -reading the thermometer graduated indicators in decimal degrees after the introduction of the water to be tested for 10 minutes.
DETERMINATION OF TEMPERATURE: AIR AND WATER
THE HYDROGEN ION CONCENTRATION (PH OF THE WATER)
It is an essential indicator for the characterization of acidity or alkalinity of water. According to water quality standards, they are considered to be "neutral" when the pH is between 6.5 and 8.5.
DETERMINATION OF WATER PH INDICATOR PAPER MERCK
Principle: Comparing the colour of pH indicator paper in contact with water on the standard scale. PALTINENI PH = 7MAGURA PH= 7,5
DETERMINATION OF PH WATER WITH PH METER
Principle: The potential difference between a glass, electrode and a reference electrode (calomel - saturated KCl), introduced in the water sample varies linearly with the pH of the sample.
DETERMINATION OF PH WATER WITH PH METERPALTINENI PH=7,05MAGURA PH=7,2VADU PASII PH=7,21
DETERMINATION OF CONDUCTIVITY
The electrical conductivity of the water is determined and depends on the content of electrolytes and their strength. Determining the electrical conductivity of a water sample based on the property of an aqueous solution to conduct electrical current and consists in measuring electrical resistance of a column of solutionPALTINENI = 331SMAGURA = 637 SVADU PASII = 1591 S
DETERMINATION OF CONDUCTIVITY
DETERMINATION OF ALKALINITYThe alkalinity of water is given by the presence of bicarbonate, carbonate alkali, alkaline earth (TEROS) and hydroxides. Principle: neutralization of an amount of water sample with a dilute acid in the presence of acid-base indicator. The alkalinity determined in the presence of phenolphthalein (pH = 8.2) is permanent alkalinity and is given by the free bases and alkali metal carbonates. The alkalinity determined in the presence of methyl orange (pH = 4.4) is the total alkalinity and is given by the free bases , carbonates and alkali metal bicarbonates. Reagent titration is a solution HCl 0.1N with a known factor
DETERMINATION OF ALKALINITY- PLTINENIPermanent alkalinity 0Total alkalinity - 2,4 ml HCl 0,1 N/dm3
DETERMINATION OF ALKALINITY MGURAPermanent alkalinity 0Total alkalinity - 2,4 ml HCl 0,1 N/dm3
DETERMINATION OF CHLORIDES
Chlorides derived from soil or pollution from animal or human. Principle: Cl- ion present in the water is determined by volumetric methods based on precipitation reactions. Cl- ion is reacted with AgNO3 in a neutral to form insoluble silver chloride. Is used as an indicator of potassium chromate solution. The development of scarlet color for silver chromate, indicates the end point of the titration.
DETERMINATION OF CHLORIDESindicator of potassium chromate solution100 ml water sample
DETERMINATION OF CHLORIDES
PALTINENI CCl = 12,76 mg/l
MAGURA - CCl= 75,16 mg/l
VADU PASII - CCl = 12,76 = 186,48 mg/l
Titration with AgNO3 0,02 moli/l
DETERMINATION OF HARDNESS
Calcium is present in all water element as bicarbonates, sulfates and chlorides. Excess calcium prints brackish water taste Magnesium is found in water generally in the form of sulphates and high concentration of water prints disagreeable taste and a laxative effect. These two elements TDS. Principle: Ca2+ and Mg2+, form the solution of the complexone III (EDTA), in a basic medium and in the presence of specific indicators stable complexes.
DETERMINATION OF CALCIUM50 ml sample water
2 ml NaOH
CALCIUM CARBONIC ACID INDICATOR TITRATION WITH EDTA 0,01 MOL/L FROM VIOLET COLOR AT BLUE COLORPALTINENI CCa2+ = 60,31 mg/l
MAGURA CCa2+= 59,29 mg/l
VADU PASII CCa2+ = 85 mg/l
DETERMINATION OF HARDNESS50 ml sample water4 ml amoniacal solutionblack eriocrom T indicator
DETERMINATION OF HARDNESSTitration with EDTA 0,01 mol/l from violet color at blue colorPALTINENI DT = 9,170G= 163,68 mg/l CaCO3MAGURA DT= 13,370G = 238,65 mg/lCaCO3VADU PASII DT = 22,270G =397,48 mg/l CaCO3
DETERMINATION OF MAGNEZIUMPALTINENI CMg2+ = 3,19 mg/l
MAGURA CMg2+= 22,58 mg/l
VADU PASII CMg2+ = 44,93 mg/l
high, good, moderate, poor and bad with the corresponding color code (blue, green, yellow, orange and red).BUZAU RIVER ECOLOGICAL STATUS is high, good and moderate with the corresponding color code (blue, green, yellow)
Thank you for your attentionStudents of XII-th graders from natural resources and environmental protection profile, coordinated by teachers Magdalena Coman and Emilia Popa