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OSMIUM Method 252.1 (Atomic Absorption, direct aspiration) STORET NO. Total* Optimum ConcentratIon Range: 2-100 mg/l usmg a wavelength of290 9 nm Sensitivity: 1mg/l DetectIonLimIt: 0 3mg/l PreparatIon of Standard SolutIon 1 2 Sample 1 Sample 1 Stock SolutlOn A standard AAS solution of osmIUm tetrox1de, OS04' 1000 mg/l m aqueous matnx 1S aval1able from Alfa Products, Beverly, Massachusetts 01915 Cat #88084 Prepare dl1utlOns of the stock solutlOn to be used as cahbratlOn standards at the time of analys1s The cahbratlOn standards should be prepared to contam 1% (v/v) HN03 and 1% (v/v) H2S04 PreservatIon For sample handhng and preservatlOn, see part 4 1 of the Atom1c Absorpt10n Methods sectlOn ofth1s manual Preparation Transfer a representative 100 ml ahquot of the well m1xed sample to a Gnffin beaker and add 1ml ofconc dIstilled HN03 Place the beaker on a steam bath or hot plate and warm for 15 mmutes Cool the beaker and filter to remove msoluble matenal that could clog the atomIzer Add 1ml ofconc H2S04and adjust the volume back to 100 ml The sample IS now ready for analysIs Instrumental Parameters (General) 1 OsmIUm hollow cathode lamp 2 Wavelength 290 9 nm 3 Fuel Acetylene 4 OX1dant N1trous oXIde 5 Type offlame Fuel nch AnalysIs Procedure 1 For the analysIs procedure and calculatlOn, see "DIrect Asp1ratlOn", part 9 1 of the Atom1c AbsorptlOn Methods sectlOn ofth1s manual *Not Ass1gned Approved for NPDES Issued 1976 Techmcal reVISIon 1978 252 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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