Separation of organic and inorganic arsenic species by capillary zone electrophoresis

Capillary zone electrophoresis has been used to separate arsenite, arsenate, dimethylarsinic acid, and phenyl-, p-aminophenyl-, and o-aminophenylarsinic acids. Identification and quantification of the arsenic species at mg L(-1) levels was possible by use of direct UV detection at 200 nm. The relative standard deviation (n = 7) ranged from 0.97 to 1.52% for migration times and from 2.08 to 4.31.% for peak areas. A method for rapid separation of inorganic arsenic species was also developed; by use of this method arsenite and arsenate could be separated within 2 min.