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<br />METHOD 7740 <br />SELENIUM (ATOMIC ABSORPTION, FURNACE METHOD) <br />Start <br />7.1 <br />Type Sludge-type <br />of sample for samples <br />sample <br />preparation <br />Aqueous <br />samples <br />7.1.1 Transfer <br />portion of sample 7.1 Prepare <br />to beaker; add 30% sample according <br />H~O2 and conc. to Method 3050. <br />HNO3 ;heat. <br />7.1.2 Cool; <br />bring to <br />volume. <br />7.1.3 Pipet digested <br />solution into flask; <br />add nickel nitrate <br />solution; dilute. <br />A <br />7740 - 7 <br />CD-ROM Revision D <br />Date September 1986 <br />