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1 2 Sample 1 Sample 1 Stock SolutlOn Carefully weIgh 100 g of zmc metal (analytIcal reagent grade) and dissolve cautlOusly m 10 ml HN03 When solutlOn IS complete make up to 1 lIter with delOnlZed distIlled water 1 ml = 1 mg Zn (1000 mg/1) Prepare dIlutlOns of the stock solution to be used as calIbratlOn standards at the time of analySIS The calIbratlOn standards should be prepared usmg the same type ofaCid and at the same concentratlOn as Will result m the sample to be analyzed either directly or after processmg Preservation For sample handlmg and preservation, see part 4 1 of the AtomIC AbsorptlOn Methods section ofthis manual Preparation The procedures for preparatlOn of the sample as given m parts 4 1 1 thru 4 1 4 of the AtomiC AbsorptlOn Methods sectlOn ofthis manual have been found to be satisfactory ZINC Method 289.1 (Atomic Absorption, direct aspiration) Optimum Concentration Range: SensItivity: a02 mg/1 Detection Limit: 0 005 mg/1 Preparation of Standard Solution STORET NO. Total 01092 Dissolved 01090 Suspended 01091 005-1 mg/1 usmg a wavelength of213 9 nm Instrumental Parameters 1 Zmc hollow cathode lamp 2 Wavelength 2139 nm 3 Fuel Acetylene 4 OXidant A i r 5 Type offlame OXldlzmg AnalYSIS Procedure 1 For the analySIS procedure and the calculatlOn, see "direct asplratlOn" part 9 1 of the AtomiC AbsorptlOn Methods sectlOn oftms manual Approved for NPDES Issued 1971 Edltonal revIsion 1974 2891-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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