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IRIDIUM ,' Method 235.1 (Atomic Absorption, direct aspiration) STORET NO. Total* Optimum Concentration Range: 20-500 mg/1 usmg a wavelength of 264 0 nm SensitivIty: 8 mg/1 Detection Limit· 3 mg/1 Preparation of Standard Solution 1 2 3 Sample 1 Sample 1 ~ Stock SolutIOn DIssolve 1 147 g of ammomum chloromdate (NH4)2 IrCI6, m a mmimum volumeof1%(vIv)HCIanddl1uteto100mlwIth1%HCI(1ml = 5mgIr) A standard AAS solutIOn of chioromdic aCId, HJrCI6, 1000 mg/1 m aqueous matnx IS aval1able from Alfa Products, Beverly, Massachusetts 01915 Cat #88072 Prepare dl1utIOns of the stock solutIOn to be used as cahbratIOn standards at the tIme of analysIs The cahbratIOn standards should be prepared to contam 05% (v/v) HN03 Preservation For sample handhng and preservatIOn, see part 4 1 of the AtomIC AbsorptIon Methods sectIon ofthIS manual Preparation Transfer a representatIve ahquot of the well mIxed sample to a Gnffin beaker and add 3 ml of cone dIstIlled 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 toneardryness Coolandadd11dIstl1ledHN03(1mlper100mldtlutIon) Washdown the beaker walls and watch glass wIth dIstl1led water and filter the sample to remove sIhcates 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 addIng three volumes cone Hel to one volume of cone HN03 *Not AssIgned Approved for NPDES Issued 1976 Techmcal reVISIon 1978 235 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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