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SULFATE Method 375.2 (Colorimetric, Automated, Methylthymol Blue, AA II) STORET NO. 00945 1 Scope and ApplicatIOn 11 This automated method IS applicable to dnnkmg and surface waters, domestic and mdustnal wastes 12 Samples m the range of 3 to 300 mg S04/1 can be analyzed The sensitIvity of the method can be mcreased by a mmor modIficatIOn to analyze samples m the range of 0 5 to 30 mg S04/1 Approximately30samplesperhourcanbeanalyzed 2 Summary of Method 21 The sample IS first passed through a sodmm form cation-exchange column to remove multivalent metal Ions The sample contammg sulfate IS then reacted With an alcohol solutIOn of banum chlonde and methylthymol blue (MTB) at a pH of 2 5-3 0 to form banum sulfate The combined solutIOn IS raised to a pH of 125-130 so that excess banum reacts With MTB The uncomplexed MTB color IS gray, If It IS all chelated With banum, the color IS blue Imtlally, the banum and MTB are eqUlmolar and eqUlvalent to 300 mg S04/1, thus the amount of uncompiexed MTB IS equal to the sulfate present 3 Sample Handlmg and Preservation 3 1 Refngeratlon at 4°C 4 Interferences 41 The Ion exchange column elimmates mterferences from multivalent cations A mid-scale sulfate standard contammg Ca++ should be analyzed penod1cally to msure that the column IS functlOmng properly 42 Samples With pH below 2 should be neutrahzed because high aCid concentratIOns elute catIOns from the IOn exchange resm 43 Turbid samples should be filtered or centnfuged 5 Apparatus 5 1 Techmcon Auto Analyzer cons1stmg of 5 11 Sampler 5 1 2 Mamfold-h1gh or low level (FIgure I) 5 1 3 ProportlOmng pump 5 1 4 Colonmeter eqUlpped With 15 mm flow cell and 460 nm mterference filters 5 1 5 Recorder 5 1 6 Digital Pnnter for AAII (optIOnal) 6 Reagents 6 1 Barmlh chlonde Dissolve 1 526 g ofbanum chlonde dihydrate (BaCI2-2H20) m 500 ml of distilled water and dilute to 1 liter Pendmg approval for NPDES Issued 1978 3752-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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