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1 2 3 SULFATE Method 375.3 (Gravimetric) STORET NO. Total 00945 Scope and ApphcatlOn 1 1 ThIS method 1<; apphcab1e to dnnkmg, surface and sahne water, domestic and mdustnal wastes 12 ThIS method IS the most accurate method for sulfate concentratlOns above 10 mg/l Therefore, It should be used whenever results of the greatest accuracy are reqUired Summary of Method 2 1 Sulfate IS preCIpItated as banum sulfate m a hydrochlonc aCId mediUm by the addItion of banum chlonde After a penod of digestlOn, the preCIpItate IS filtered, washed WIth hot water until free ofchlonde, Igmted, and weIghed as BaS04 2 2 Preserve by refngeratlOn at 4°C Interferences 31 HIgh results may be obtamed for samples that contam suspended matter, mtrate, sulfite andsIhca 32 Alkah metal sulfates frequently yIeld low results ThIS IS espeCIally true of alkah hydrogen sulfates OccluslOn of alkah sulfate WIth banum sulfate causes the SubstItutIon ofanelementofloweratomICweIghtthanbariUmmthepreCIpItate Hydrogensulfateof alkah metal acts SImIlarly and decomposes when heated Heavy metals such as chromiUm and Iron, cause low results by mterfenng WIth complete preCIpItatIOn and by formatIOn of heavy metal sulfates Apparatus 41 Steam bath 42 Drymg oven, eqUIpped WIth thermostatic control 43 Muffie furnace WIth heat mdicator 44 DeSICcator 45 Analytical balance, capable ofweIghmg to a 1 mg 46 FIlter paper, aCId-washed, ashless hard-fimsh filter paper suffiCIently retentive for fine preCIpItates Reagents 4 5 5 1 5 2 5 3 Methyl red mdicator solutIOn DIssolve 100 mg methyl red sodiUm salt m dIstIlled water m a 100 ml volumetnc flask and dIlute to the mark WIth dIstIlled water Hydrochlonc aCId, HCI, 1+1 Banum chlonde solutIOn DIssolve 100 g BaCI2-2H20 m 1 hter of dIstIlled water FIlter through a membrane filter or hard-fimsh filter paper One ml of thIS reagent IS capable of precipitatmg approxImately 40 mg S04 Approved for NPDES Issued 1974 Editonal reVISlOn 1978 3753-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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