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SELENIUM Method 270.2 (Atomic Absorption, furnace technique) Optimum ConcentratIon Range: DetectIon LImIt: 2 ug/l PreparatIon of Standard Solution 5-100 ug/l 1 2 3 4 Sample 1 Sample 1 2 3 Stock SeleDlum Solution DIssolve 0 3453 g ofselenous aCid (actual assay 946% H2Se03) m deIODlzed distIlled water and make up to 200 ml 1 ml = 1 mg Se (1000 mg/l) Nickel Nitrate SolutIOn, 5% Dissolve 24 780 g of ACS reagent grade NI(N03)2.6H20 m deloDlzed distIlled water and make up to 100 ml Nickel Nitrate SolutIOn, 1% DIlute 20 ml of the 5% Dlckel Dltrate to 100 ml with deIODlzed distIlled water Workmg SeleDlum SolutIOn Prepare dIlutIOns of the stock solutIOn to be used as calIbratIOnstandardsatthetimeofanalySIS WithdrawapproprIatealIquotsofthestock solution, add 1 ml of conc HN03, 2 ml of 30% H20 2and 2 ml of the 5% Dlckel nItrate solutIOn Dl1ute to 100 ml With deIOnIZed dlstl1led water PreservatIon For sample handlIng and preservatIOn, see part 4 1 of the Atomic AbsorptIOn Methods section of this manual PreparatIon Transfer 100 ml of well-mIXed sample to a 250 ml GrIffin beaker, add 2 ml of 30% H 20 2 andsuffiCientconc HN03toresultmanaCidconcentrationof1%(v/v) Heatfor1hour at 95°C or until the volume IS slIghtly less than 50 ml Cool and brmg back to 50 ml With deiOnIzed dlstl1led water Pipet 5 ml of thiS digested solutIOn mto a lO-ml volumetrIC flask, add 1 ml of the 1% nIckel nItrate solution and dIlute to 10 ml With deIOnIzed distIlled water The sample IS now ready for mJectIOn mto the furnace NOTE If solubilIzatIOn or digestIOn IS not reqUIred adjust the HN03concentratIOn ofthe sample to 1% (v/v) and add 2 ml of30% H20 2 and 2 ml of 5% nIckel nItrate to each 100 ml of sample The volume of the calIbratIOn standard should be adjusted With deiOnIzed distilled water to match the volume change of the sample Approved for NPDES and SDWA Issued 1978 2702-1 STORET NO. Total 01147 Dissolved 01145 Suspended 01146PDF Image | Methods for Chemical Analysis of Water and Wastes
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