ABSTRACT
The four arsenic (As) species commonly reported to be present in environmental materials are arsenite, arsenate, monomethylarsonate, and dimethylarsinate. For the isolation and fractionation of these species ion exchange procedures are frequently utilized, employing both strongly and weakly basic anion and strongly acidic cation exchange resins. Ion exchangers of this type are used in connection with the determination of arsenic in industrial products. Separations of arsenic (As) species by means of cation exchange, which is often combined with the subsequent use of anionic resins, have variously been employed in connection with the determination of As in natural waters, biological materials, industrial products and synthetic mixtures. No separation of arsenite from arsenate can be obtained in dilute alkaline solutions from which both species are retained by basic resins. Adsorption of As on basic resins from both hydrobromic and hydroiodic acid media approaches completeness with increasing acidity.
