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OptimumConcentratIonRange: SensItIvIty: 0 4 mg/l DetectIOnLimit: 0 1mg/l STORET No. Total 01062 Dissolved 01060 Suspended 01061 1-40mg/l usmgawavelengthof313 3nm MOL YBDENUM Method 246.1 (Atomic Absorption, direct aspiration) PreparatIon of Standard SolutIon 1 Stock SolutIOn Dissolve I 840 g of ammOnium molybdate (NH4)6M07024-4H20 (analytical reagent grade) m deIOnized dlstllled water and dllute to 1 hter 1 ml = 1 mg Mo (1000 mg/l) 2 Alummum nitrate solutIOn Dissolve 139 g alummum nitrate, AI(N03)3-9H20, m 150 ml ofdeIOnized dlstllled water, heat to effect solutIOn Allow to cool and make up to 200 ml 3 Prepare dllutlons of the stock molybdenum solutIOn to be used as cahbratton standards atthetimeofanalysIs Thecahbrattonstandardsshouldbepreparedusmgthesametype of aCid and at the same concentratIOn as will result m the sample to be analyzed either directly or after processmg To each 100 ml ofstandard and sample ahke, add 2 ml ofthe alummum nitrate solutIOn Sample PreservatIOn 1 For sample handhng and preservation, see part 4 1 of the Atomic AbsorptIOn Methods section of this manual Sample PreparatIOn 1 The procedures for preparatIOn of the sample as given m parts 4 1 1 thru 4 1 4 of the Atomic AbsorptIOn Methods sectIOn of this manual have been found to be satisfactory Instrumental Parameters (General) 1 Molybdenum hollow cathode lamp 2 Wavelength 313 3 nm 3 Fuel Acetylene 4 OXidant Nitrous OXide 5 Type offlame Fuel nch Approved for NPDES Issued 1974 Edltonal reVISIOn 1978 2461-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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