Reversed-Phase Thin-Layer Chromatography of Inorganic Anions on Tri-n-Butyl Amine Impregnated Silica Gel-G Layers: Separation of Coexisting I-, IO3- and IO4-, Fe(CN)(6)(4-) and Fe(CN)(4)(3-)

摘要

The chromatographic behavior of 24 inorganic anions has been studied on tri-n-butyl amine (TBA) impregnated silica gel-G layers using single solvents, two-component non-aqueous mixtures, and aqueous solutions of organic acids as mobile phases. The mechanism of migration is explained in terms of adsorption, precipitation, solubility of sodium or potassium salts of the anions, and the polarity of the mobile phase used. The effect of pk(1) of the complexing acids and that of dielectric constant (is an element of) of non-aqueous solvents used as mobile phases on the R-F values of anions are discussed. Twenty-percent TBA impregnated silica gel-G layers are found quite effective in the separation of anions. The effect of the addition of DMF to other organic solvents on the R-F values is also discussed. A number of useful binary and ternary separations are achieved, e.g., the separation of coexisting I-, IO3-, and IO4- and of Fe(CN)(6)(4-) and Fe(CN)(6)(3-) from their mixtures. The R-F values of the anions are found to be in accordance with their lyotropic numbers.