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8 PrecIsion and Accuracy 8 1 Forty analysts m seventeen laboratones analyzed syrtthetlc water samples contammg 7 2 where A= mlstandardaCid N= normahtystandardaCid Potentlometnc titration oflow alkahmty Total alkahmty mg/1 CaCO = (2B - C) X N >< 50,000 , 3 ml of sample where B = ml titrant to first recorded pH C = total ml titrant to reach pH 0 3 umts lower N= normahtyofaCld mcrements ofbicarbonate, with the followmg results Increment as Alkahmty mg/hter, CaCO; 8 9 113 119 PreC1Sl0n as Standard DeviatIOn mglhter, CaC03 127 1 14 528 5 3 6 Blasj -% +10.61 +22.29 ... 8.19 - 7.42 Accuracy as mg/l, CaC03 +085 +20 -93 ...8 8 (FWPCA Method Study 1, Mmeral and Physical Analyses) 8 2 In a smgle laboratory (EMSL) usmg surface water samples at an average concentratIOn of122mgCaC03/1,thestandarddeviationwas ±3 Bibliography 1 Standard Methods for the ExammatlOn of Water and Wastewater, 14th EditIOn, p 278, Method 403, (1975) 2 Annual Book ofASTM Standards, Part31, "Watel", p 113,0·1067, Method B, (1976) 310 1-3 Bias,PDF Image | Methods for Chemical Analysis of Water and Wastes
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