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KI and 310 mg NaHC03m distilled water and dilute to 1 hter ThiS titrant IS eqmvalent to 500 ug S03/1 00 ml 5 5 Sulfamlc ACid Crystalhne 5 6 EDTA Reagent Dissolve 2 5g EDTA m 100 ml dlstl1led water 6 Procedure 61 Samphng Contact with air must be mlmmlzed If the sample temperature IS greater than 50·C, It must be cooled m a special apparatus descnbed elswhere (see Blbhography) Immediately add 1ml ofEDTA SolutIOn (56) per 100 ml ofsample 62 Starch Indicator 62 1 Place 1ml H2S04 (5 1) m titratIOn vessel 622 Adda1gsulfamlCaCidcrystals(5 5) 623 Add50mlsample 624 Addapproximatelya1gstarchmdlCator(52) 625 Titrate with potassIUm IOdide-IOdate titrant (54) untl1 a famt permanent blue color develops Keep the pipet tip below the surface of the sample View the color change agamstawhitebackground Recordthemltitrant 626 Run a reagent blank usmg dlstl1led water mstead ofsample (623) 63 Dual Purpose Sulfite IndlCator Powder 6 3 1 Place 50 ml sample m a titratIOn vessel 6 3 2 Add 3-4 drops phenolphthalem mdlcator 633 Add suffiCient scoops (lg) ofmdlCator (53) to discharge the red color 6 3 4 Titrate with potassIUm IOdide-IOdate titrant (5 4) untl1 a famt permanent blue color develops View the color change agamst a white background Record the ml titrant 6 3 5 Run a reagent blank usmg distilled water mstead ofsample (6 3 1) 7 CalculatIOns 7 I 7 2 Usetheformula where m/1SO =AxNx40,000 g J ml sample A =mltitrant(625or634)B=ml B= mltitrantfortheblank(626or635)and N = normahty ofKI-KI03titrant (5 4) To calculate as Na2S03 mg/lNa2SOJ = mg/lS03X 157 8 PrecIsion and Accuracy 8 1 PrecIsion and accuracy data are not aval1able at thiS timePDF Image | Methods for Chemical Analysis of Water and Wastes
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