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1 2 Sample I Sample 1 Stock SolutIOn Carefully weigh 1 000 g of pure Iron wire (analytical reagent grade) and dissolvem5mlredistilledHN03, warmmgIfnecessary WhensolutIOnIScompletemake up to 1hter With deIOnIzed distilled water 1ml = 1mg Fe (1000 mg/I) Prepare dilutions of the stock solutIOn to be used as cahbratlon standards at the time of analySIS ThecahbratlOnstandardsshouldbepreparedusmgthesametypeofaCidandat 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 I of the Atomic Absorption Methods sectIOn ofthis manual Preparation The procedures for preparation of the sample as given m parts 4 1 I thru 4 I 4 of the Atomic AbsorptIOn Methods sectIOn of this manual have been found to be satisfactory IRON Method 236.1 (Atomic Absorption, direct aspiration) Optimum ConcentratIOn Range: Sensitivity: 0 12 mg/l Detection Limit 0 03 mg/l Preparation of Standard Solution STORET NO. Total 01045 Dissolved 01046 Suspended 01044 03-5 mg/l usmg a wavelength of248 3 nm Instrumental Parameters (General) 1 Iron hollow cathode lamp 2 Wavelength 248 3 nm 3 Fuel Acetylene 4 OXidant Air 5 Type offlame OXldlzmg AnalYSIS Procedure 1 For analySIS procedure and calculatIOn, see "Direct AspIratIOn", part 9 1 of the Atomic Absorption Methods sectIOn of this manual Approved for NPDES Issued 1971 Edltonal revIsion 1974 and 1978 236 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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