Direct determination of metal to halide mole ratios in platinum complex anions [PtCl6-nBrn]2- (n=0-6) by means of HPLC-ICP-OES using Cl, Br and Pt emissions of all separated species

A hyphenated HPLC-ICP-OES method for the direct determination of the metal to ligand mole ratios for the series of individually separated Pt-II/IV chlorido-bromido [PtCl4](2-), [PtCl6](2-) and [PtCl6-nBrn](2-) (n = 0-6) species by simultaneous monitoring of the Pt (177.708 nm), Cl (134.724 nm) and Br (148.845 nm) ICP emissions leads to a novel and unambiguous method of chemical speciation of such Pt-II/IV complexes in acidic aqueous solutions.