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6 Procedure 7 CalculatIOns 8. 1 A = ml of0 0250 N standard IodIne solutIOn (5 2) B = ml of0 0250N standard redUCIng sodIUm thosulfate or phenylarsIne OXide) solutIOn (5 3) Precision and Accuracy 8 1 PreCISIOn and accuracy for this method have not been determIned BIblIography Standard Methods for the ExamInatIon of Water and Wastewater, 14th EditIon, p 505, Method 428D, (1975) 6 1 Unpreclpltated sample 6 1 1 Place a known amount of standard IOdIne solutIOn (5 2) Into a 500 ml flask The amount should be estimated to be In excess ofthe amount ofsulfide expected 6 1 2 Add distIlled water, Ifnecessary, to bnng the volume to approximately 20 ml 613 Add2mlof6NHCl(5 1) 62 6 3 Precipitated samples 62 1 Add the reagents to the sample In the ongtnal bottle Perform steps 6 1 1, 6 1 3, 615, and 616 Dewatered samples 6 3 1 Return the glass fibre filter paper which contaInS the sample to the ongInal bottle Add 200 ml dlst111ed water Perform steps 6 1 1,6 1 3,6 1 5, and 6 1 6 6 3 2 The calculatIOns (7) should be based on the volume of ongtnal sample put through the filter 7.1 7 2 where One ml of0 0250 N standard IOdIne solutIOn (52) reacts With 04 mg ofsulfide present In the titratIOn vessel Use the formula mg/l sulfide = 400 (A - B) ml sample 6 1 4 6 1 5 6 1 6 Pipet 200 ml of sample Into the flask, keepIng the tiP of the pipet below the surface ofthe sample If the IOdIne color disappears, add more IOdIne untl1 the color remaInS Record the total number of ml1hhters of standard IOdIne used In performIng steps 6 1 1 and 615 Titrate With the redUCIng solutIOn (0 0250 N sodIUm thIOsulfate or 0 0250 N phenylarsIneOXidesolutIOn(53ยป USIngastarchIndicator(54)untl1thebluecolor disappears Recordthenumberofml1hhtersused 3761-2 "IPDF Image | Methods for Chemical Analysis of Water and Wastes
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