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COBALT Method 219.1 (Atomic Absorption, direct aspiration) Optimum ConcentratIOn Range: SensitIvity. 02 mg/l Detection Limit: 0 05 mg/l STORET NO. Total 01037 Dissolved 01035 Suspended 01036 05-5 mg/l usmg a wavelength of240 7 nm Preparation of Standard SolutIOn 1 Stock SolutIOn DIssolve 4 307 g of cobaltous chlonde, CoClz-6HzO (analytIcal reagent grade), m deIOlllzed dIstdled water Add 10 ml ofconcentrated llltnc aCId and ddute to I hter wIth deIOlllzed dIstIlled water 1ml = I mg Co (1000 mg/l) 2 Prepare ddutions of the stock cobalt solutIOn to be used as cahbratIOn standards at the tIme of analysIs The cahbratIOn 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 Sample Preservation I For sample handhng and preservatIon, see part 4 I of the AtomIC AbsorptIon Methods sectIon ofthIS manual Sample Preparation 1 The procedures for preparation of the sample as gIVen m parts 4 1 I thru 4 1 4 of the AtomIC AbsorptIOn Methods sectIon ofthIS manual have been found to be satisfactory Instrumental Parameters (General) I Cobalt hollow cathode lamp 2 Wavelength 240 7 nm 3 Fuel Acetylene 4 OXIdant AIr 5 Type ofFlame OXIdIzmg AnalysIs Procedure I For analysIs procedure and calculatIOn, see "DIrect AspIratIOn", part 9 1 of the AtomIC AbsorptIOn Methods sectIOn ofthis manual Approved for NPDES Issued 1974 Editonal reVISIon 1978 219 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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