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CHROMIUM Method 218.3 (Atomic Absorption, chelation-extraction) STORET NO. 01034 1 Scope and Apphcatton 11 ThIs method covers the determmatton of total chromlUm m drmkmg, surface and sahne waters The method may also be apphcable to certam domestIc and mdustnal wastes provIded that no mterfenng substances are present (See 3 1) 12 The method may be used to analyze samples contammg from 1 0 to 25 ug of chromlUm per hter 13 For sample handlmg and preservatlOn, see part 4 1 of the AtomIC Absorption Methods sectlOn of thIs manual 2 Summary ofthe Method 2 1 2 2 ThIs method IS based on the chelatlOn of hexavalent chromlUm wIth ammomum pyrrohdme dithtocarbamate (APDC) followmg oXIdation of tnvalent chrommm The chelate IS extracted wIth methyl Isobutyl ketone (MIBK) and aspIrated mto the flame of the atomIC absorptIOn spectrophotometer Hexavalent chrommm may also be chelated wIth pyrrohdme dlthlOcarbamlc aCId m chloroform as descnbed m sectlOn 9 2 ofthe atomIC absorptlOn text found m thIs manual 3 Interferences 3 1 HIgh concentratIOns of other reactIve metals, as may be found m wastewaters, may mterfere The method IS free from mterferences from elements normally occurnng m fresh water 4 Instrumental Parameters (General) 41 Chrommm hollow cathode lamp 42 Wavelength 3579 nm 43 Fuel Acetylene 44 OXIdant AIr 45 Typeofflame Fuelnch(adjustfororgamcsolvent) 5 Reagents 51 Ammomum pyrrohdme dlthlOcarbamate (APDC) solutlOn demmerahzed water and dllute to 100 m 1 Prepare fresh dally DIssolve 1 0 9 APDC m 52 Bromophenol blue mdicator solutIOn DIssolve 0 1 g bromophenol blue m 100 ml 50-percent ethanol 53 Potassmm dIchromate standard solutlOn, 10 ml = 008 mg Cr DIssolve 02263 g dned analytICal reagent grade K2Cr20 7 m demmerahzed water and make up to 1000 ml 54 Tnvalent chrommm stock solutlOn, 10 ml = 0002 mg Cr+3 PIpet 500 ml of the potassmm dIchromate standard solutlOn (53) mto an Erlenmeyer flask Add apprOXImately 15 mg Na2S03 and 05 ml concentrated HN03 Gently evaporate to Approved for NPDES and SDWA Issued 1978 2183-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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