REVERSED-PHASE ION-PAIR PARTITION CHROMATOGRAPHY OF BROMO-ANION COMPLEXES OF PLATINUM GROUP METALS ( RHODIUM(III), PALLADIUM(II), AND PLATINUM(IV) )

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A novel method for the separation of bromo-anion complexes of platinum group metals ( Rh, Pd and Pt ) by reversed-phase ion-pair partition chromatography has been developed. The excellent separation of RhBr₅^2- PdBr₄^2-and PtBr₆^2-was accomplished on a Fine SIL C₁₈ ( ODS ) packed column, where acetonitrile - phosphate buffer ( pH 7 ) mixture containing tetrabutylammonium bromide and sodium bromide was used as a mobile phase. These anion complexes can be detected at 310 nm, and the amount of PtBr₆^2- as low as 1 × 10^-11mol can be determined with the peak height method which gave a straight calibration curve. In this paper, the effects of ion-pair reagents, acetonitrile-water ratio, pH, temperature and light on the chromatogram are reported.