TLC Resolution Studies of Two-Phase Separation of Metal-...

Published: Journal of Chromatographic Science, Volume 34, Number 6, June 1996, pp. 300-304.

TLC Resolution Studies of Two-Phase Separation of Metal-2-Mercapto-4-Methyl-5-Phenylazopyrimidine Complexes on Various Surfactant-Impregnated Silica Gel-G Plates
Ashok Kumar

Mercapto-4-methyl-5-phenylazopyrimidine (MMPAP) complexes
of cobalt(II), nickel(II), lead(II), cadmium(II), and copper(II) are resolved using various pure and binary solvent mixtures on silica gel-G plates and on different surfactant-impregnated silica gel-G plates. Thin-layer chromatography of complex mixtures with the binary solvent, acetonitrile–xylene (70:30), provides an effective separation of the complexes, especially when tetrabutyl ammonium hydroxide is used as the surfactant. Slope analysis applied to metal ion distribution experiments from 3M HNO₃ shows a predominant formation of the solvated organic phase complex M(NO₃)₂•²MMPAP. The developed method is tested for the determination of cobalt(II), nickel(II), lead(II), cadmium(II), and copper(II) in standard alloys.

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