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CHLORIDE Method 325.2 (Colorimetric, Automated Ferricyanide AAII) STORET NO. 00940 1 Scope and ApphcatIOn 1 1 ThIS automated method IS apphcable to dnnkmg, surface, and sahne waters, domestIc and mdustra1 wastes The apphcab1e range IS 1 to 200 mg ClIl ThIs range may be extendedbysampledIlutIOn ApproxImately30samplesperhourcanbeanalyzed 2 Summary of Method 2 1 ThIocyanate Ion (SCN) IS hberated from mercunc thIOcyanate through sequestratIOn of mercury by chlonde Ion to form un-IOmzed mercunc chlonde In the presence of fernc lon, the hberated SCN forms hIghly colored fernc thIOcyanate m concentratIOn proportIOnal to the ongmal chlonde concentratIOn 3 Sample HandlIng and PreservatIOn 3 1 No specIal reqUIrements 4 Interferences 4 I No sIgmficant mterferences 5 Apparatus 5 1 Techmcon AutoAnalyzer conslstmg of 5 11 Sampler 6 Reagents 6 1 62 63 64 Mercunc thIOcyanate solutIOn DIssolve 4 17 gm of Hg(SCN)2 m 500 ml of methanol DIlute to 1 lIter wIth methanol, mIX and filter through filter paper Fernc mtrate solutIOn, 20 2% DIssolve 202 gm of Fe(N03)3·9 H20 m 500 ml of dIstIlled water Add315mlconcmtncaCId,mIXanddIluteto1lIterwIthdIstIlledwater Color reagent Add 150 ml of mercunc thIOcyanate solutIon (6 1) to 150 ml of fernc mtrate solutIOn (6 2), mIX, and dIlute to 1 lIter wIth dIstIlled water Stock SolutIOn (0 0141 N NaCl) DIssolve 08241 g ofpre-dned (140°C) NaCI m dIstIlled water DIlute to I hter m a volumetnc flask 1ml = 0 5 mg CI 6 4 1 Prepare a senes ofstandards by dIlutmg SUItable volumes ofstock solutIOn to 100 0 mlwIthdIstIlledwater ThefollowmgdIlutIOnsaresuggested Approved for NPDES Issued 1978 5 1 5 I 5 1 5 1 5 1 5 1 2 Contmuous filter (optIOnal) 3 AnalytIcal cartndge 4 ProportIOmng pump 5 Co1onmeter eqUIpped wIth 15 mm tubular flow cell and 480 nm filters 6 Recorder 7 DIgItal pnnter (optIOnal) 3252-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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