The determination of arsenic by electrothermal atomic absorption spectrometry with a graphite furnace: Part 2. Determination of arsenic(III) and arsenic(V) after extraction |
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| Authors: | D Chakraborti W De Jonghe F Adams |
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| Institution: | Department of Chemistry, University of Antwerp (U.I.A.), B-2610 WilrijkBelgium |
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| Abstract: | A procedure is described for the sequential determination of arsenite and arsenate in samples of natural waters. It is based on the extraction of arsenic(III) with ammonium sec-butyl dithiophosphate and measurement, after re-extraction into water, by graphitefurnace atomic absorption spectrometry. Reduction of arsenic(V) allows its subsequent determination. The method is applied to fresh and sea water samples. The detection limit is 6 ngl-1. |
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