| Summary: | ABSTRACT
The applicability of atomic absorption spectrometer (AAS ) as a detector in high-performance liquid chromatography ( HPLC) for arsenic specialion was investigated. Anion-exchange HPLC is used for separation of arsenite, arsenate, monomethylarsinate and dimethylarsonate, followed by a continuous sodium tetrahydroborate reduction and atomic absorption detection. The influence of the mobile phase pH on the separation, resolution, and limit detection was determined. The best separation was on pH 6.00. Detection limits ( as arsenic ) were 1 ng for arsenite, 3 ng for arsenate, 15 ng for monomethylarsinate and 5 ng for dimethylarsonate.
Key words : arsenic speciation
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