J. Chromatography A (in press)
ABSTRACT. The influence of four kinds of cationic polymers on electrophoretic mobilities of V(V), Co(II), Ni(II), and Fe(II) - 4-(2-pyridilazo)-resorcinolato (PAR) chelates was investigated in kinetic differentiation (KD) mode capillary electrophoresis (CE). It was shown that the addition of cationic polymers strongly changes selectivity of such a type of separations. Four parameters of carrier electrolyte (pH, counter-ion, polymer, and acetonitrile concentrations) were changed to examine the elution order of the complexes. The behaviour of the chelates can be described in terms of ion-exchange separation. Fast separation of the four chelates with efficiency of more than 450,000 theoretical plates per meter in CE with reverse polarity power supply was easily performed.