Normal Phase, Reversed Phase and Chelation Thin Layer Chromatographic Studies of Some Toxic Metal Ions in two Component Solvent Systems Containing DMSO: Quantitative Separation of Pb²⁺ from Hg₂²⁺, Hg²⁺₅ Tl⁺, Bi³⁺, Sn⁴⁺, and Sb³⁺

Abstract

Normal phase, reversed phase and chelation thin layer chromatography of some toxic metal ions was performed in DMSO-HNO₃ and DMSO-HC1 systems. The effect of solvent composition on migration of cations has been explained in terms of adsorption, precipitation and specific solvation effect of DMSO. The effect of EDTA and DMSO impregnation on R_F values was studied. TBP and TBA impregnated layers were used for reversed phase thin layer chromatography. The differential migration was utilized to resolve chemically similar elements. Besides it was possible to separate cations of same element having different oxidation states. Quantitative separation of lead from binary mixtures and synthetic alloys, cent a inino Cu²⁺, Sn⁴⁺, Bi³⁺, Sb³⁺, Cd²⁺, Ni ²⁺ Hg₂ ²⁺ and Hg²⁺ has also been experimentally achieved.