Chelation ion chromatography on Alizarin Red-S loaded stannic silicate —Selective separation of Cd²⁺ and Pb²⁺ from some transition metal ions

Abstract

A chromatograhically useful packing material has been prepared by the adsorption of Alizarin Red-S on cation exchanger stannic silicate. Adsorption behaviour of some transition and heavy metals on Alizarin Red-S loaded stannic silicate has been studied in aqueous solutions of <i style="">p</i>H 1-6. This material has been used for the selective separation of Cd²⁺ and Pb²⁺ from a mixture of several cations, viz. Cr³⁺, Hg²⁺, Fe³⁺, Co²⁺ and Ni²⁺using nitric acid solution of <i style="">p</i>H 1 and 6 as eluents. In addition, some binary separations of metal ions, namely Zn²⁺ - Cd²⁺, Mn²⁺ - Cd²⁺, Hg²⁺ - Cd²⁺, Al³⁺ - Pb²⁺ and Cr³⁺ - Pb²⁺ have also been achieved on a chromatographic column packed with Alizarin Red-S loaded stannic<b> </b>silicate.