BEHAVIOR OF SELENIUM AND TELLURIUM SPECIES AND THEIR DETERMINATION BYION CHROMATOGRAPHY

An ion chromatographic method has been developed for the separation of Te(IV) and Se(IV) in hydrochloric acid mobile phases; the method has been used to determine tellurium in a high-purity non-stoichiometric s emiconducting ZnCdTe-based material. Different cation-exchange columns (IonPac CS2, CS3, CS10), a mixed bed ion-exchange column (IonPac CS5) , a multi-mode cation-exchange column (OmniPac PCX-500), anion-exchang e columns (IonPac AS4, AS4A, AS5, AS5A, AS10, AS11) and a multi-mode a nion-exchange column (OmniPac PAX-500) were evaluated for ion chromato graphic separation of Se and Te and to study the chemical forms in whi ch the analytes were eluted. The chromatographic data obtained enabled the calculation of both the sign and the charge of the eluting specie s.