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1 2 Sample 1 Sample 1 Stock SolutIOn Carefully weigh I 000 g of manganese metal (analytlCal reagent grade) and dissolve m 10 ml of redistilled HN03 When solutIOn IS complete, dllute to 1 hter wlthl%(VIV)HCllml = ImgMn(1000mg!l) Prepare dilutIOns of the stock solution to be used as cahbratlOn standards at the time of analysIs The cahbratlOn standards should be prepared usmg the same type of aCid and at the same concentratIOn as will result m the sample to be analyzed either directly or after processmg Preservation For sample handhng and preservatIOn, see part 4 1 of the Atomic AbsorptIOn Methods sectIOn ofthis manual PreparatIon The procedures for preparatIOn of the sample as given m parts 4 I 1 thru 4 1 4 of the Atomic AbsorptIOn Methods sectIOn of this manual have been found to be satisfactory MANGANESE Method 243.1 (Atomic Absorption, direct aspiration) Optimum Concentration Range: SensItIvity: 0 05 mg!1 Detection Limit: 001 mg!1 Preparation ofStandard SolutIon STORET NO. Total 01055 Dissolved 01056 Suspended 01054 0 1-3 mg!1 usmg a wavelength of279 5 nm Instrumental Parameters (General) 1 Manganese hollow cathode lamp 2 Wavelength 2795 nm 3 Fuel Acetylene 4 OXidant Air 5 Type offlame OXldlzmg AnalysIs Procedure 1 For analysIs procedure and calculation, see "Direct AspiratIOn", part 9 I of the Atomic AbsorptIOn Methods sectIOn of this manual Approved for NPDES Issued 1971 Edltonal reVISIOn 1974 and 1978 243 I-IPDF Image | Methods for Chemical Analysis of Water and Wastes
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