The elution behaviors of a series of metal complexes, such as Co(gly)3, [Ni(en)3]2+, [Ni(phen)3]2+, [Fe(phen)3]2+, [Co(phen)3]3+, [Co(tn)3]3+, [Co(en)3]3+ and [Co(NH3)6]3+ (where gly; glycine, phen; phenanthroline, tn; trimethylenediamine, en; ethylenediamine), were studied in aqueous solution by measuring the retention volumes (v values) on SP-Sephadex C-25, cation exchange resin. It was found that the elution behaviors of metal complexes were apparently affected by salt concentrations, kinds of cations in eluent and kinds of anions in eluent, and according to the degrees of their effects coulombic forces, ion exchange capacities, the `solvent effect` of resin backbone, hydrophobicity and hydrophilicity were applied to explain the elution mechanism.
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