Metal ion chelation chromatography on dithizone sorbed stannic silicate : Binary separation of Cd2+, Hg2+, Pb2+ and c.-3+ from Fe3+ and Al3+

Department of Chemistry, Aligarh Muslim University, Aligarh-202 002, Uttar Pradesh, India

PG Department of Chemistry, University of Kashmir, Srinagar-190 006, J & K, India 

University Science Instrumentation Centre, University of Kashmir, Srinagar-190 006, J & K, India

E-mail : muzaffar2000@gmail.com

Manuscript received 12 October 2011, revised 13 February 2012, accepted 11 April 2012

Stannic silicate, a cation exchanger, has been modified by adsorption with dithizone. Adsorption behaviour of several transition and heavy metal ions like AJ³⁺, Cr³⁺, Mn²⁺, Fe³⁺, Co²⁺, Ni²⁺, Cu²⁺, zn²⁺, Cd²⁺, Hg²⁺ and Pb²⁺ on the modified ion exchanger from aqueous solution at different pH (from 1-6) has been studied and their distribution coefficients (Kd) calculated. While Cd²⁺, Hg2+, Pb²⁺ and Cr³⁺ show very high adsorption on the modified exchanger, Fe³⁺ and AJ³⁺ are adsorbed the least among the metal ions studied. On the basis of distribution coefficients binary separations of Cd²⁺, Hg²⁺, Pb²⁺ and Cr³⁺ from Fe³⁺ and AJ³⁺ have been achieved on a chromatographic column packed with dithizone sorbed stannic silicate using nitric acid solution of pH 6 and pH 1 as eluents.