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1 2 Sample 1 Sample 1 Stock SolutIOn Dissolve 1 923 g ofchromIUm tnoxlde (Cr03, reagent grade) m deIOnIZed dlstl1led water When solutIOn IS complete, aCidify with redlstdled HN03 and dllute to 1 hter with deIOnIZed dlstl1led water 1ml = 1mg Cr (1000 mg/l) Prepare dl1utIOns of the stock solutIOn to be used as cahbratlon standards at the time of analysIs ThecahbratIOnstandardsshouldbepreparedusmgthesametypeofaCidandat the same concentratIOn as Will result In 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 1 1 thru 4 1 4 of the AtomiC AbsorptIOn Methods sectIOn ofthis manual have been found to be satisfactory CHROMIUM Method 218.1 (Atomic Absorption, direct aspiration) Optimum Concentration Range: Sensitivity: 0 25 mg/l Detection Limit: 0 05 mg/l Preparation of Standard Solution STORET NO. Total 01034 Dissolved 01030 Suspended 01031 0 5-10 mg/l usmg a wavelength of357 9 nm Instrumental Parameters (General) 1 ChromIUm hollow cathode lamp 2 Wavelength 3579nm 3 Fuel Acetylene 4 OXidant Nitrous OXide 5 Type offlame Fuel nch 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 and SDWA Issued 1971 Edltonal revIsion 1974 and 1978 218 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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