DETERMINATION OF PLATINUM(II) IN THE PRESENCE OF RHODIUM(III), RUTHENIUM(III), OSMIUM(III) AND IRIDIUM(III) BY MICELLAR ELECTROKINETIC CAPILLARY CHROMATOGRAPHY

Micellar electrokinetic capillary chromatography (MECC) with on-column UV detection at 214 nm was used to detect slid determine platinum(II) in the presence of Rh(III), Ru(III), Os(III) and Ir(III) in acidic me dium (HCl+KCl, pH=3.0). Under an applied voltage of 15 KV, platinum(II ) tetrachloride (PtCl42-) was separated and detected ill less than 4 m in. A cathodic injection and anodic detection scheme was used. The ele ctroosmotic flow was reversed by a cationic surfactant (CTMAB) and the analysis time was shortened. The linear calibration range is 0.2-40 m u g/ml. The detection limit is 0.2 mu g/ml. The method is most useful for samples digested in HCl/HNO3. The method is simple, rapid and high ly selective.