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RHODIUM Method 265.1 (Atomic Absorption, direct aspiration) STORET NO. Total* Optimum Concentration Range: 1-30 mg/1 usmg a wavelength of 343 5 nm SensitIvIty: 03 mg/1 Detection LImIt: 0 05 mg/1 Preparation of Standard Solution 1 Stock SolutIOn DIssolve 0 3768 g of ammomum chlororhodIte, (NH4)3RhCI6-H20, m a mmimum volume of 10% (v/v) HCI and dilute to 100 ml with 10% HCI (1 ml = 1mg Rh) 2 A standard AAS solution ofrhodmm tnchlonde, RhCI3, 1000 mg/1 m aqueous matnx is aval1able from Alfa Products, Beverly, Massachusetts 01915 Cat #88090 3 Prepare dl1utlOns of the stock solutIOn to be used as cahbratlOn standards at the time of analysis The cahbratlOn standards should be prepared to contam 0 5% (v/v) HN03 Sample PreservatIon 1 For sample handhng and preservation, see part 4 1 of the Atomic AbsorptIOn Methods section of this manual Sample Preparation 1 Transfer a representative ahquot of the well mIXed sample to a Gnffin beaker and add 3 ml of cone distl1led HN03 Place the beaker on a steam bath and evaporate to near dryness Cool the beaker and cautIOusly add a 5 ml portion of aqua 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 11 distl1led HN03(1 ml per 100 ml dl1utlQn) Wash down the beaker walls and watch glass with distl1led water and filter the sample to remove sl1icates and other msoluble matenal that could clog the atomizer Adjust the volume to somepredetermmedvaluebasedontheexpectedmetalconcentratIOn Thesampleisnow ready for analysis tAqua regia-prepare ImmedIately before use by carefully addmg three volumes of conc Hel to one volume of conc HN03 *Not ASSigned Approved for NPDES Issued 1976 Techmcal reViSion 1978 265 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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