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7 8 Calculatlons 7 1 Read ug SI02from cahbratton curve or by vIsual companson 1 2 7 3 Report whether NaHC03 dIgestIOn (6 2) was used PrecISIOn and Accuracy 81 A synthetlc unknown sample contammg 5 0 mg/l SI02' 10 mg/l chlonde, 0 200 mg/l ammoma N, 10 mg/l mtrate N, 15 mg/l orgamc N, and 10 0 mg/l phosphate m dIstIlled water was analyzed m 19 laboratones by the molybdosIhcate method, wIth a relatlve standard devIatIOn of 143% and a relative error of7 8% 82 Another synthetIc unknown sample contammg 150 mg/l SI02, 200 mg/l chlonde, 0800 mg/l ammoma N, 10 mg/l mtrate N, 0800 mg/l orgamc N, and 50 mg/l phosphate m dIstIlled water was analyzed m 19 laboratones by the molybdosIhcate method, wIth a relative standard devIatIOn of8 4% and a relative error of4 2% 83 A thIrd synthetlc unknown sample contammg 300 mg/l SI02, 400 mg/l chlonde, 1 50 mg/l ammoma N, 10 mg/l mtrate N, 0200 mg/l orgamc N, and 0500 mg/l phosphate m dIstIlled water was analyzed m 20 laboratones by the molybdosIhcate method, wIth a relatIve standard devIatIOn of 7 7% and a relative error of 9 8% All results were obtamed after sample dIgestIOn wIth NaHC03 84 Photometnc evaluatIons by the ammo-naphthol-sulfomc aCId procedure have an estImated precIsIOn of ±O 10 mg/l m the range from 0 to 2 mg/l (ASTM) 85 Photometnc evaluatIOns of the sIhco-molybdate color m the range from 2 to 50 mg/l have an estImated precIsIOn of approXImately 4% of the quantlty of sIhca measured (ASTM) BIblIography Annual Book ofASTM Standards, Part 31, "Water", Standard D859-68, p 401 (1976) Standard Methods for the Exammation of Water and Wastewater, 14th EdItIon, p 487, Method 426B, (1975) 72 mg/lSI02= Ug/SI02 ml sample 370 1-5PDF Image | Methods for Chemical Analysis of Water and Wastes
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