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GOLD Method 231.1 (Atomic Absorption, dire~t aspiration) STORET NO. Total 71910 Optimum Concentration Range: 05-20 mg/1 usmg a wavelength of242 8 nm SensitIvIty: 0 25 mg/1 Detection LImIt: 0 1 mg/1 Preparation of Standard Solution 1 2 3 Sample 1 Sample 1 Stock SolutlOn DIssolve 01000 g of gold metal m a mmimum volume of aqua reglat Take to near dryness, cool, add 5 ml HCI, and dIlute to 100 ml wIth delOmzed water Store m an amber glass bottle (1 ml = 1 mg Au) A standard AAS solutlOn of chloroaunc aCId, HAuCI4, 1000 mg/1 m aqueous matnx IS avaIlable from Alfa Products, Beverly, Massachusetts 01915 Cat #88068 Prepare dIlutlOns of the stock solutlOn to be used as cahbratlOn standards at the tIme of analysIs The cahbratlOn standards should be prepared to contam 0 5% (v/v) HN03 Preservation For sample handhng 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 HN03 Place the beaker on a steam bath and evaporate to near dryness Cool the beaker and cautlOusly add a 5 ml portlOn of aqua regta (See below for preparatlOn 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 1dIstIlled HN03 (1 ml per 100 m1 dIlutIon) 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 somepredetermmedvaluebasedontheexpectedmetalconcentratlOn ThesampleISnow ready for analysIs tAqua regta-prepare ImmedIately before use by carefully addmg three volumes of conc HCL to one volume of conc HN03 Approved for NPDES Issued 1976 Techmcal reVISIon 1978 231 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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