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OptImum Concentration Range: SensItiVIty. 0 25 mg!1 DetectIOnLImIt: 0 1mg/l PreparatIon of Standard Solution 05-15 mg!1 usmg a wavelength of247 6 nm , 1 2 3 Sample 1 Sample 1 Stock SolutlOn Dissolve 0 1000 g of palladIUm Wire m a milllmum volume of aqua regia and evaporateJust to dryness Add 5 ml conc RCI and 25 ml delOlllzed water and warm until dissolutlOn IS complete Dilute to 100 ml with delOlllzed water (1 ml = 1 mg Pd) A standard AAS solution of palladous chlonde, PdC12, 1000 mg!l m aqueous matnx IS available from Alfa Products, Beverly, Massachusetts 01915 Cat #88085 Prepare dilutIOns of the stock solutlOn to be used as cahbratlOn standards at the tIme of analysis The calIbratlOn standards should be prepared to contam 05% (v!v) RN03 PreservatIon For sample handlIng and preservatlOn, see part 4 1 of the AtomiC AbsorptlOn Methods sectlOn ofthis manual Preparation Transfer a representative ahquot of the well mixed sample to a Gnffin beaker and add 3 ml of conc dIstilled R N 0 3 Place the beaker on a steam bath and evaporate to near dryness Cool the beaker and cautIously add a 5 ml portlOn ofaqua regia (See below for preparation of aqua regia t) Cover the beaker wIth a watch glass and return to the steam bath Contmue heatmg the covered beaker for 30 mmutes Remove cover and evaporate to near dryness Cool and add 1 1 redIstilled RN03 (1 ml per 100 ml dilutlOn) Wash down the beaker walls and watch glass wIth distilled water and filter the sample to remove sihcates and other msoluble matenal that could clog the atomizer Adjust the volume to some predetermmed value based on the expected metal concentratlOn The sample IS now ready for analysis P ALLADIUM , Method 253.1 (Atomic Absorption, direct aspiration) STORET NO. Total 01210 tAqua regia-prepare immediately before use by carefully addmg three volume of cone Hel to one volume of cone HN03 Approved for NPDES Issued 1976 Techlllcal reViSion 1978 253 I-IPDF Image | Methods for Chemical Analysis of Water and Wastes
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