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1 Scope and ApphcatlOn SULFIDE Method 376.1 (Titrimetric, Iodine) Th1s method 1S apphcable to the measurement of total and d1ssolved sulfides m dnnkmg, surface and sahne waters, domestic and mdustnal wastes AC1d msoluble sulfides are not measured by the use ofth1s test (Copper sulfide 1S the only common sulfide m th1s class) 1 1 I 2 1 3 2 1 Excess lOdme 1S added to a sample wh1ch mayor may not have been treated w1th zmc acetate to produce zmc sulfide The lOdme oX1d1zes the sulfide to sulfur under aC1d1c cond1tlOns The excess lOdme 1S backt1trated w1th sodmm thlOsulfate or phenylarsme oX1de 3 Comments Th1s method 1S smtable for the measurement of sulfide m concentratlOns above 1 mg/l 2 Summary of Method 3 1 32 33 Reduced sulfur compounds, such as sulfite, thlOsulfate and hydrosulfite, wh1ch decompose m aC1d may y1eld erratic results Also, volatile lOdme-consummg substances wdl give h1gh results Samples must be taken w1th a m1mmum of aeratlOn Sulfide may be volatthzed by aeratlOn and any oxygen madvertently added to the sample may convert the sulfide to an unmeasurable form Ifthesample1SnotpreservedwlthzmcacetateandNaOH,theanalys1smustbestarted 1mmed1ately S1m1larly,themeasurementofd1ssolvedsulhdesmutalsobecommenced 1mmed1ately 4 Apparatus Ordmary laboratory glassware 5 Reagents 51 Hydrochlonc aC1d, H CI, 6 N 52 Standard 10dme solutlOn, 0 0250 N D1ssolve 20 to 25 g KI m a httle water in a hter volumetnc and add 3 2 g 10dme Allow to d1ssolve Ddute to 1 hter and standard1ze agamst 0 0250 N sodmm thlOsulfate or phenylarsme oX1de usmg a starch md1cator 53 PhenylarsmeoX1de00250N commerc1allyavadable 54 Starchmd1cator commerCiallyavadable 55 Procedure for standard1zation (see Res1dual Chlonne-lOdometnc titration Method 3303, sectlOn 5 15) Approved for NPDES Issued 1971 Ed1tonal reV1S1on 1978 376 1-1 STORET NO. Total 00745 Dissolved 00746PDF Image | Methods for Chemical Analysis of Water and Wastes
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