Use of cationic polymers for the simultaneous determination of inorganic anions and metal-4-(2-pyridylazo)resorcinolato chelates in kinetic differentiation-mode capillary electrophoresis

Three cationic polymers were used as electroosmotic flow and selectivity modifiers for simultaneous determination of inorganic anions and metal-4-(2-pyridylazo)resorcinolato (PAR) chelates. It was shown that the ability of polymers to associate with analytes decreased in the order: poly-(N-ethyl-4-vinylpyridinium bromide)>poly-(diallyldimethylammonium chloride)>Polybrene. CrO42- was chosen as a background electrolyte anion, because it enables indirect UV detection of transparent analytes at 254 nm and do not affect the detection sensitivity of chelates at 490 nm. Rapid (4 min) separation of Co(II), Ni(II), and Fe(II)-PAR chelates and of 11 inorganic anions was demonstrated. (C) 1997 Elsevier Science B.V.