Author(s): Poonam Ajwani, Loni Lokwani, Uma Sharma
Binding of metal ions through selective reagents are of special importance to broad areas of analytical chemistry and separation science. Bulk liquid membrane transport of Li+, Na+, K+, Mg2+ and Ca2+ was carried out through tetraethylene glycol diacrylate (TEGDAc) immersed in organic membrane viz. 1,2-dichloroethane, chloroform and carbon tetrachloride from picrate (Pic?), dinitrophenolate (Dnp?) and orthonitrophenolate (Onp?) salts. It was observed that the used podand has good efficiency to transport Ca2+ over other metal ions from its picrate salt. Variation in reduced concentration was also noted showing maximum at intermediate times. Transport ability of ligand and selectivity of Na+ over K+ were also observed by using coexisting picrate salts. The technique offers the advantages of active transport, possible usage of expensive carriers, high selectivity, low capital and operating cost in textile and food industry, hydrometallurgy, medicine, biotechnology and environment protection.