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PLATINUM Method 255.1 (Atomic Absorption, direct aspiration) STORET NO. Total* Optimum Concentration Range: 5-75 mg/l usmg a wavelength of265 9 nm SensItivity: 2 mg/l Detection Limit: 0 2 m g / l Preparation of Standard Solution 1 Stock SolutlOn Dissolve 0 1000 g of platmum metal m a minimum volume of aqua regia andevaporatejusttodryness Add5mlHCIand01gNaCIandagamevaporatejustto dryness Dissolve the residue m 20 ml of (1 1) HC! and dl1ute to 100 ml with delOnlzed water(lml= 1mgPt) 2 A standard AAS solutlOn ofchloroplatmlc aCid, H2PtCI6, 1000 mg/l m aqueous matnx IS aval1able from Alfa Products, Beverly, Massachusetts 01915 Cat #88086 3 Prepare dl1utlOns of the stock solution to be used as cahbratlOn standards at the time of analysIs ThecahbratlOnstandardsshouldbepreparedtocontaina5%(v/v)HN03 Sample Preservation 1 For sample handlIng and preservation, see part 4 1 of the AtomiC AbsorptlOn Methods sectlOn ofthis manual Sample Preparation 1 Transfer a representative ahquot of the well mixed sample to a Gnffin beaker and add 3 ml of conc distilled HN03 Place the beaker on a steam bath and evaporate to near dryness Cool the beaker and cautlOusly add a 5 ml portion of aqua regia (See below for preparation ofaqua 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 1dlstl1led HN03 (1 m1 per 100 ml dl1utlOn) Wash down the beaker walls and watch glass with dlstl1led water artd filter the sample to remove sl1lcates and other msoluble material that could clog the atomizer Adjust the volume to somepredetermmedvaluebasedontheexpectedmetalconcentratlOn ThesampleISnow ready for analysIs tAqua regIa-prepare Immedtately before use by carefully addmg three volumes of conc Hel to one volume of conc HN03 *Not ASSigned Approved for NPDES Issued 1976 Technical reVISion 1978 255 I-IPDF Image | Methods for Chemical Analysis of Water and Wastes
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