Specific separation of nickel ion with bathophenanthroline disulfonic acid by capillary zone electrophoresis Original Research Article

Separation of five transition metal ions (Fe(II), Co(II), Ni(II), Cu(II), and Zn(II)) with bathophenanthroline disulfonic acid (BPS) was investigated by capillary zone electrophoresis. The results of a specific separation for Ni(II)-BPS were obtained. Separation of three species of the Ni(II)-BPS complexes ([Ni(BPS)], [Ni(BPS)2]2−, [Ni(BPS)3]4−) could be accomplished. The results were compared with those of Fe(II)-, Co(II)-, Cu(II)-, and Zn(II)-BPS and Ni(II)-1,10-phenanthroline.