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CHLORIDE Method 325.1 (Colorimetric, Automated Ferricyanide AAI) STORET NO. 00940 1 Scope and Apphcation 1 1 ThIs automated method IS apphcable to dnnkIng, surface, and sahne waters, domestIc and Industnal wastes The apphcable range IS 1 to 250 mg ClIl ApproXImately 15 samples per hour can be analyzed 2 Summary of Method 2 1 ThIOcyanate IOn (SCN) IS hberated from mercurIC 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 In concentratIon proportIOnal to the ongInal chlonde concentratIOn 3 Sample Handhng and PreservatIOn 3 1 No speCIal reqUirements 4 Interferences 4 1 No sIgmficant Interferences 5 Apparatus 5 1 Techmcon AutoAnalyzer consIstIng of 6 Reagents 6 1 6 2 63 Fernc Ammomum Sulfate DIssolve 60 g of FeNHlS04)2-12H20 In approxImately 500 ml dIstIlled water Add 355 ml of conc HN03 and dIlute to 1 hter WIth dIstIlled water FIlter Saturated Mercunc ThIOcyanate DIssolve 5 g of Hg(SCN)2 In 1 hter of dIstIlled water Decant and filter a portIon of the saturated supernatant hqUId to use as the reagent and refill the bottle WIth dIstIlled water Stock SolutIOn (0 0141 N NaCl) DIssolve 08241 g ofpre-dned (140°C) NaCI In dIstIlled water DIluteto 1hterInavolumetncflask 1ml = 0 5mgCI 63 1 Prepare a senes ofstandards by dIlutmg SUitable volumes ofstock solutIOn to 100 0 mlWIthdIstIlledwater ThefollOWIngdIlutIOnsaresuggested Approved for NPDES Issued 1971 5 1 5 1 5 1 5 1 5 1 5 1 1 Sampler I 2 Contmuous filter 3 Mamfold 4 ProportIOmng pump 5 Colonmeter eqUipped WIth 15 mm tubular flow cell and 480 nm filters 6 Recorder 325 I-IPDF Image | Methods for Chemical Analysis of Water and Wastes
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