Abstract
On-line removal of transition metal interferences in microscale suction-flow hydride generation atomic absorption spectrometry is described for the determination of selenium at μg l −1 levels. A mini-column of a chelating resin with iminodiacetate groups is used. Selenium in solutions containing ⩽ 2.5 mg of copper or nickel was determined at a rate of 30 samples per hour; the detection limit was 0.1 ng of selenium. The relative standard deviation for ten replicate measurements of 5 ng of selenium was 3.8%. The method was applied successfully to the determination of selenium in standard copper alloys and nickel sponge.
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