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7 CalculatIOn mg chlonde/l - (A - B)N x 35,450 ml of sample where A = ml tItrant for sample B = ml tItrant for blank N = normalIty mercunc mtrate tItrant mg NaClil = mg chlonde/l x 165 8 PreCIsIOn and Accuracy 8 1 Forty two analysts m eIghteen 1aboratones analyzed synthetIc water samples contammg Increment as Chlonde mg/hter PreCISIon as Standard DeviatlOn Bias, mg/hter % Accuracy as 8.2 8 3 In a smgle laboratory (EMSL), usmg surface water samples at an average concentratIOn of34mgClIl,thestandarddeVIatIOnwas ±10 A synthetIc unknown sample contammg 241 mg/1 chlonde, 108 mg/1 Ca, 82 mg/l Mg, 3 1 mg/1 K, 199 mg/1 Na, 1 1 mg/1 mtrate N, 025 mg/1 mtnte N, 259 mg/1 sulfate and 425 mg/1 total alkalImty (contnbuted by NaHC03) m dIstIlled water was analyzed m 10 laboratones by the mercunmetnc method, WIth a relatIve standard deVIatIOn of 33% and a relatIve error of2 9% BIblIography exact mcrements ofch10nde, WIth the followmg results 17 154 +216 +04 18 132 +350 +06 91 97 382 398 292 316 11 70 11 80 +011 +01 -051 -05 -061 -23 -1 19 -47 (FWPCA Method Study 1, Mmeral and PhYSICal Analyses) 1 Annual Book of ASTM Standards, Part 31, "Water", Standard D512-67, Method A, p 270 (1976) 3253-3 BIas, mg/hterPDF Image | Methods for Chemical Analysis of Water and Wastes
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