SPECIATION ANALYSIS OF ARSENIC AND SELENIUM-COMPOUNDS BY CAPILLARY ELECTROPHORESIS

High-performance capillary electrophoresis is applied to the separatio n of different inorganic and organic arsenic and selenium compounds. I n comparison with UV-detection, an approach with conductivity detectio n is described expecting higher sensitivity and universality. In this case the capillary was statically modified with CTAB before the electr omigration procedure, The separation was performed with an electrolyte system consisting of CHES and Triton X-100. Detection limits of 0.06 mg/L or lower were obtained for As(V) and Se(VI). Water samples of an arsenic-polluted tailing of tin mining processes were analysed for ani ons as well as arsenic and selenium species.