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6 4 6 3 3 Above 50 mg/l the accuracy decreases and the suspensions lose stability. 6 3 4 Check rehablhty of cahbratiOn curve by runmng a standard with every 3 or 4 samples Correction for sample color and turbidity 64 1 Run a sample blank usmg the proceduIe 6 1and 6.2 without the addition ofbanum chlonde(614) 7 CalculatiOns 7 1 Read mg SO4from cahbratlon curve mgS04/1= mgS04X1,000 ml sample 8 PrecIsIon and Accuracy 8 1 ThIrty-four analysts m 16 laboratories analyzed six synthetic water samples contammg exact mcrements of morgamc sulfate With the following results' Increment as Sulfate mg/hter 86 92 110 122 188 199 PrecisIon as Standard DeVIatIOn BIas, mglhter % 230 -372 178 -8.26 786 -301 750 -337 958 +004 Accuracy as 118 -170 (FWPCA Method Study 1, Mmeral and Physical Analyses) BIas mg/hter -03 -08 -33 -41 +01 -34 8 2 A synthetIc unknown sample contammg 259 mg/l sulfate, 108 tng/l Ca, 82 mg/l Mg, 3 1 mg/l K, 199 mg/l Na, 241 mg/l chlonde, 0250 mg/l mtnte N, 1 1 mg/l mtrate N, and 425 mg/l total alkahmty (cont11.buted by NaHC03) was analyzed m 19 laboratones by the turbldlmetnc method, With a relatIve standard deViation of 9 1% and a relatIve error of 1 2% Bibliography 1 Annual Book of ASTM Standards, Part 31, "Water", Standard D516-68, Method B, p 430 (1976) 2 Standard Methods for the Exammatlon of Water and Wastewater, 14th EditiOn, p 496, Method 427C, (1975) 375.4-3PDF Image | Methods for Chemical Analysis of Water and Wastes
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