Separation of inorganic selenium species on anion-exchange resins

Abstract

Preconcentration and separation of inorganic selenium (Se^IV and Se^VI) in water samples was investigated using several anion-exchange resins. The best separation was obtained with the functionalized cellulose sorbent Cellex T. Se^IV and Se^VI adsorbed on the resin were eluted with 10 ml of 0.01 mol l^–1 HNO₃ and 7 ml of 4 mol l^–1 HNO₃, respectively, and determined by electrothermal atomization atomic absorption spectrometry. The detection limit for Se^IV is 2.1 g l^–1 and for Se^VI 2.4 µg l^–1.