DETERMINATION OF PALLADIUM(II) AS A CHLORO COMPLEX BY CAPILLARY ZONE ELECTROPHORESIS

A novel method of separating and determining palladium as the chloro complex PdCl42- in the presence of rhodium(III), ruthenium(III), osmium(III) and iridium(III) chloro complexes by capillary zone electrophoresis (CZE) is described. On-column direct UV detection was achieved at 214 nm and the detection limits were lower than 20 ppb. By adding a suitable long-chain cationic surfactants, 0.2 mM cetyltrimethylammonium bromide, to the carrier electrolyte to create a layer of positive charges at the capillary wall and by reversing the polarity of the CZE system (cathodic injection and anodic detection scheme), analyte anions were caused to migrate in the direction of the electroosmotic flow, and thus the analysis time (3.0 min) was shortened. The effect of sample stacking on the plate number was investigated.