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7 5 Cool the sample to room temperature and tItrate electrometncally wIth standard sodIUm hydroxIde (6 2) to pH 8 2 8. Calculations 81 ACidity,asmg/lCaC0 = 3 [(A x B) - (C x D)] x 50,000 ml of sample 82 where A = vol ofstandard sodIUm hydroxide used In tItratIon B = normalIty ofstandard sodIUm hydroxIde C= volumeofstandardsulfuncaCIdusedtoreducepHto4orless D = normalIty ofstandard sulfunc aCId IfIt IS desired to report aCidity In mllleqUlvalents per lIter, the reported values as CaC03 are diVIded by 50, as follows ACIdity as meqll - mg/l CaC03 50 9. PrecIsIon 9 I On a round robIn conducted by ASTM on 4 aCId mIne waters, IncludIng concentratIOns up to 2000 mg/I, the precIsion was found to be ±10 mg/l BiblIography 1 Annual Book ofASTMStandards, Part 31, "Water", p 116, D 1067, Method E(1976) 2 Standard Methods for the EXamInatIOn of Water and Wastewater, 14th Edition, p 277, Method 402(4d) (1975) 305 1-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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