Abstract
A flow-injection system is described for the selective determination of arsenic(III) and arsenic(V) (0.05–20 ng) in a 100μl sample volume by hydride generation and atomic absorption spectrometry. An electrically heated aluminium column was used to generate the arsine in an alkaline medium. Recoveries averaged 97–99% for arsenic(III) and 95–98% for arsenic(V) with relative standard deviations of less than 4.3% in each instance. The detection limit was 0.25 μg l −1 (25 pg) of arsenic in both instances. This method was relatively free from interferences and was applied successfully to the determination of arsenic(III) and arsenic(V) in trout fishery water samples. The data obtained were compared with those produced by a hydride generation-cold trapping atomic absorption spectrometric detection method, using sodium tetrahydroborate(III) in hydrochloric acid. The results obtained by both methods were in close agreement, within 96-102%
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