1993 Volume 19 Issue 2 Pages 348-351
Experiment of simultaneous adsorption of nickel and cobalt on porous glass showed that di-ammine complexes of these metals were adsorbed by a ligand substitution and that the selectivity coefficient of these metals was 5.1 to 8.5 in the pH7.2 to 7.5 region. When porous glass was applied to separation of these metals by chromatography, the suitable concentration of ammonium chloride in eluent was 0.6 mol/l. With increasing concentration of ammonium chloride in conditioning solution, almost complete separation was accomplished, but a part of the cobalt component was oxidized to become insoluble. Supersonic irradiation of liquid phase was found to be effective for prevention of oxidation.