Determination of platinum(IV) by UV spectrophotometry

A simple, rapid and sensitive spectrophotometric procedure for the determination of platinum has been elaborated. Pt traces were determined in the form of the PtCl62- complex in hydrochloric acid solution whose concentration varies from 0.01 to 2 mol L-1 by measuring the absorbance at 260 nm. The detection limit is 4.7 x 10(-7) mol L-1, the linearity range from 2 x 10(-6) mol L-1 to 7 x 10(-6) mol L-1, and the correlation coefficient is r = 0.9990. No significant interferences were observed from a majority of the investigated ions, such as Zn(II), Pb(II), Mn(II), Cd(II), Co(II) and Ni(II) with the exception of Cu(II), Sb(III), Fe(III), Pd(II), Sn(II) and I- ions. The method was successfully applied for the determination of Pt traces in different solid samples and the recovery from inorganic materials was studied.