SEPARATION OF TRANSITION-METALS AS COMPLEXES WITH ORGANIC-REAGENTS BYCAPILLARY ZONE ELECTROPHORESIS WITH DIRECT PHOTOMETRIC DETECTION - COBALT(II), COBALT(III), COPPER(II), IRON(II), AND NICKEL(II) 2,2'-DIPYRIDYLATES

The effects of the applied voltage and concentrations of cetyltrimethy lammonium bromide and 2,2'-dipyridyl in an acetate buffer electrolyte (pH 4.2) on the migration behavior of cobalt(II), (III), copper(II), i ron(II), and nicke(II) chelates with 2,2'-dipyridyl were studied. The conditions for the complete separation of all the metals studied excep t for the Fe(II)-Ni(II) pair were found. It was found that the composi tion of the inner coordination sphere of metal complexes affects the m igration rate. The possibility of enhancing the separation selectivity due to a decrease in the number of ligands in the inner coordination sphere of cobalt(II) dipyridylate, which undergoes dissociation during the separation process, is demonstrated.