STUDIES ON SPECIATION OF ARSENIOUS COMPOU NDS BY CAPILLARY-ZONE-ELECTROPHORESIS

Using phosphate as buffer solution, five arsenic species: arsenite(As( II)), monomethylarsonic acid(MMA), arsanilic acid(ANA), sodium dimethy larsinate(DMA) and arsenate (As(V)) have been separated by capillary z one electrophoresis, Experiment conditions were optimized when the on- line UV detection was operated at 191 nm. The reproducibility of this method has been studied using extended light length capillary. Relatio n between signal peak area and sample concentration has been measured, and using the largest injection volume, the detection limit has been determined. Some kind of spiked sample has also been detected.