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Interfenng Substance InhIbItor Alummum 20 Banum b CadmIUm b Cobalt over 20 Copper over 30 Iron over 30 Lead b Manganese (Mn2+) b NIckel over 20 StrontIUm b Zmc b Polyphosphate a b c 8 I Mwnmum ConcentratIOns of Interferences PermIssIble wIth Vanous Inhibitorsa MaXImum Interference ConcentratIon mgll InhIbItor II Inhibitor III 20 20 b b 20 b dIluted to 50 ml oc 20 03 5 20 20 b 1 03 bb 200 b 10 03 Based on 25-ml sample Titrates as hardness Inhibitor faIls If substance IS present 7 4 2 Inhlbltor I At step 7 2 4 add 250 mg NaCN Add sufficlent buffer to achleve pH lO 0 ± 0 1to offset alkahmty resultmg from hydrolysls ofsodlUm cyamde 7.4 3 Inmbltor II At step 724 add 1ml ofmhlbltor II (6 2 2) 744 lnillbltor III At step 7 24 add 1ml ofInhlbltor III (6 2 3) CalculatlOns Hardness (EDTA) q A x N x 50,000 mgCaC03/1 ~ ml sample where A = mlEDTAtitrant(64) N = normahtyofEDT A titrant 1302-4 ocPDF Image | Methods for Chemical Analysis of Water and Wastes
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