Abstract
Capillary zone electrophoresis and ion chromatography were used for the separation of oxomonothioarsenate, oxodithioarsenate, oxotrithioarsenate, tetrathioarsenate and arsenate. The separation by capillary zone electrophoresis was achieved by using an uncoated fused-silica capillary tube and a polyacrylamide-coated capillary tube both filled with phosphate buffers of different pH values, temperatures and, in the case of the uncoated tube, concentrations of the dynamic coating reagent cetyltrimethylammonium bromide. For ion chromatography, a silica gel and a polymer-based anion exchanger with a glyconate borate buffer were used. The capillary zone electrophoresis system showed higher efficiency than ion chromatography with regard to separation capacity, detection limits and reproducibility.
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