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ARSENIC Method 206.2 (Atomic Absorption, furnace technique) Optimum Concentration Range: 5-100 ug/1 Detection LilDlt: 1 ug/1 PreparatIon of Standard Solution 1 Stock solutIOn D1ssolve 1 320 g of arsemc tnox1de, As203 (analyt1cal reagent grade) m 100 ml ofde10mzed d1st1lled water contammg 4 g NaOH AC1dify the solutIOn w1th 20 ml conc HN03and dllute to 1hter 1ml = 1mg As (1000 mg/1) 2 N1ckelN1trateSolutIOn,5% D1ssolve24780gofACSreagentgradeN1(N03)2·6H20m deIOmzed d1st1lled water and make up to 100ml 3 N1ckel N1trate SolutIOn, 1% Dllute 20 ml of the 5% mckel mtrate to 100 ml w1th de10mzed d1st1lled water 4 Workmg Arsemc SolutIOn Prepare dllut10ns of the stock solutIOn to be used as cahbrat10nstandardsatthet1meofanalys1s W1thdrawappropnateahquotsofthestock solut10n,add1mlofconc RN03,2mlof30%R202and2mlofthe5%mcke1mtrate solutIOn Dllute to 100 ml w1th deIOmzed d1sttlled water Sample Preservation 1 For sample handlmg and preservat10n, see part 4 1 of the Atom1c Absorpt10n Methods sectIOn ofth1s manual Sample Preparation 1 Transfer 100 ml ofwell-m1xed sample to a 250 ml Gnffin beaker, add 2 ml of 30% H20 2 and suffic1ent conc HN03to result man aC1d concentration of 1%(vIv) Heat for 1 hour at 95°C or untll the volume 1S shghtly less than 50 ml 2 Cool and brmg back to 50 ml w1th deIOmzed d1st1lled water 3 P1pet 5 ml of th1s d1gested solutIOn mto a lO-ml volumetnc flask, add 1 ml of the 1% mckel mtrate solutIOn and dllute to 10 ml w1th de10mzed d1st1lled water The sample 1S now ready for mJectIOn mto the furnace Approved for NPDES and SDWA Issued 1978 2062-1 STORET NO. Total 01002 Dissolved 01000 Suspended 01001PDF Image | Methods for Chemical Analysis of Water and Wastes
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