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SIL VER Method 272.1 (Atomic Absorption, direct aspiration) OptImum ConcentratIon Range: SensItivIty: 006 mg/l Detection LImIt: 001 mg/l STORET NO. Total 01077 Dissolved 01075 Suspended 01076 0 1-4 mg/l usmg a wavelength of328 I nm PreparatIOn of Standard SolutIon 1 Stock SolutlOn DIssolve 1 575 g of AgN03 (analytiCal reagent grade) m delOmzed dlstl1led water, add 10 ml conc HN03 and make up to I hter 1 ml = 1 mg Ag (1000 mg/l) 2 Prepare dl1utlOns of the stock solutIon to be used as cahbratlOn standards at the time of analysIs The cahbratlOn standards should be prepared usmg mtnc aCId and at the same concentratlOn as wIll result m the sample to be analyzed eIther dIrectly or after processmg 3 lodme SolutlOn, 1 N DIssolve 20 grams of potasslUm lOdlde, KI (analytIcal reagent grade) m 50 ml of delomzed dIstilled water, add 127 grams of lOdme, 12 (analytIcal reagent grade) and dilute to 100 ml Store m a brown bottle 4 Cyanogen IodIde (CNI) SolutIon To 50 ml of delomzed dlstl1led water add 4 0 ml conc NH40H, 6 5 grams KCN, and 5 0 ml of ION 12 solutlOn MIX and dilute to 100 ml wIth delOmzeddIstIlledwater FreshsolutlOnshouldbepreparedeverytwoweeks(1) Sample PreservatIon 1 For sample handhng and preservatlOn, see part 4 1 of the AtomIC AbsorptlOn Methods section ofthIS manual Sample PreparatIOn 1 The procedures for preparatlOn of the sample as gIven m parts 4 1 1 thru 4 1 3 of the AtomIc AbsorptlOn Methods sectlOn of thIS manual have been found to be satIsfactory, however, the resIdue must be taken up m dilute mtnc aCId rather than hydrochlorIc to prevent preclpltatlOn of AgCI Approved for NPDES and SDWA Issued 1971 Edltonal reVlSlOn 1974 Techmcal reVlSlOn 1978 272 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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