Reversed-phase high performance liquid chromatography-spectrophotometry of several platinum group metal complexes with 4-(5-Nitro-2-pyridylazo)resorcinol

The reversed-phase HPLC of several platinum group metal complexes with a new chromogenic reagent 4-(5-nitro-2-pyridylazo)resorcinol (5-NO(2)-PAR) on an ODS column using methanol-ethyl acetate-water (50:10:40, v/v/v) containing 10 mM HAc-NaAc buffer (pH 4.0), 10 mM tetrabutylammonium bromide and 10 mM Na(2)EDTA was investigated. The detection wavelength was 536 nm. Pd(II), Rh(III), Ru(III) and Pt(II) complexes of 5-NO(2)-PAR were separated and determined simultaneously within 18 min. Calibration ranges (ng/ml) were 1.5-500 for Pd(II), 1.5-500 for Rh(III), 2.1-500 for Ru(III) and 7.8-500 for Pt(II). Detection limits were 0.5, 0.5, 0.7 and 2.6 ng/ml, respectively.