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LEAD Method 239.2 (Atomic Absorption, furnace technique) Optimum Concentration Range: Detection LImIt: 1ug/l Preparation of Standard Solution 5-100 ug/l 1 2 3 Sample 1 Sample 1 2 StocksolutIOn Prepareasdescnbedunder"dIrectaSpIratIOnmethod" Lanthanum NItrate SolutIOn DIssolve 58 64 g of ACS reagent grade La203 m 100 ml conc HN03and dIlute to 1000 ml wIth deIOnIZed dIstIlled water 1ml = 50 mg La Workmg Lead SolutIOn Prepare dIlutIOns of the stock lead solutIOn to be used as cahbratIOn standards at the tIme of analysIs Each cahbratIOn standard should contam 05% (v/v) HN03 To each 100 ml of dIluted standard add 10 ml of the lanthanum nItrate solutIOn Preservation For sample handhng and preservatIOn, see part 4 1 of the AtomIc AbsorptIOn Methods sectIOn ofthIS manual Preparation Prepare as descnbed under "direct aspIratIOn method" Sample solutIOns for analysIs should contam 0 5% (vIv) HN03 To each 100 ml of prepared sample solutIOn add 10 ml of the lanthanum nItrate solutIOn Instrument Parameters (General) 1 Drymg TIme and Temp 30 sec-125°C 2 Ashmg TIme and Temp 30 sec-500°C 3 AtomIzmg TIme and Temp 10 sec-2700°C 4 Purge Gas Atmosphere Argon 5 Wavelength 2833 nm 6 Other operatmg parameters should be set as specIfied by the partlCular mstrument manufacturer AnalysIs Procedure 1 For the analysIs procedure m the calculatIOn see "Furnace Procedure", part 9 3 of the AtomIc AbsorptIOn Methods sectIOn of thIS manual Approved for NPDES and SDWA Issued 1978 2392-1 STORET NO. Total 01051 Dissolved 01049 Suspended 01050PDF Image | Methods for Chemical Analysis of Water and Wastes
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