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OSMIUM Method 252.2 (Atomic Absorption, furnace technique) OptImum ConcentratIon Range. 50-500 ug/l DectectIOn Limit 20 ug/l PreparatIon of Standard SolutIon 1 2 3 Sample 1 Sample I Stock solutlOn Prepare as descnbed under "direct asplratlOn method" Prepare dtlutlOns of the stock solutIon to be used as cahbratlOn standards at the time of analysIs ThesesolutlOnsarealsotobeusedfor"standardadditIons" The cahbratlOn standard should be diluted to contam 1% (vIv) HN03 PreservatIOn For sample handhng and preservatlOn, see part 4 1 of the AtomIC AbsorptlOn Methods sectIon OfthiS manual PreparatIon Prepare as descnbed under "dIrect aspiratlOn method", except omit the additlOn of H2S04 on the final volume adjustment Sample SolutIons for analysIs should contam 1% (v/v)HN03 Instrument Parameters (General) 1 DrymgTImeand Temp 30sec-105°C 2 AshmgTImeandTemp SeeNOTE3below 3 AtomIzmg TIme and Temp 10 sec-2700°C 4 Purge Gas Atmosphere Argon 5 Wavelength 2909 nm 6 Other operatmg parameters should be set as specIfied by the particular mstrument manufacturer AnalysIs Procedure 1 For the analysIs procedure and the calculatIon, see "Furnace Procedure" part 9 3 of the AtomIC AbsorptlOn Methods sectlOn of thIS manual Notes 1 OsmIUm tetrOXIde, the usual commerCIal form, IS very volattle and hIghly tOXIC Care should be exercIsed when workmg WIth thIS compound *Not ASSIgned Approved for NPDES Issued 1978 2522-1 STORET NO Total*PDF Image | Methods for Chemical Analysis of Water and Wastes
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