Determination of platinum(IV) by UV spectrophotometry

Abstract

A simple, rapid and sensitive spectrophotometric procedure for the determination of platinum has been elaborated. Pt traces were determined in the form of the PtCl(6)(2-) 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.

Preparation of Li₂PtO₃ and its dissolution properties in hydrochloric acid

“…6, the UVvis spectra of the Pt-containing solutions were quite similar in shape, exhibiting absorption maxima at 262 nm, which is characteristic of the [PtCl 6 ] 2¹ complex ion. 9) Solutions from the samples calcined at 700 and 800°C also showed a peak at 262 nm. These results indicate that Pt 4+ and Cl ¹ ions formed the complex ion [PtCl 6 ] 2¹ during the dissolution treatment of Li 2 PtO 3 in HCl.…”

A Comparative Kinetic Study of Silver(I)-Catalyzed Oxidations of Alanine and Valine by Platinum (IV) in Perchloric and Sulfuric Acids Solutions

“…Chloroplatinic acid solution (Johnson Matthey) was used without further purification. Required solution of the oxidant was freshly prepared before each experiment by proper dilution of its original solution which is standardized spectrophotometrically [33]. The solution was stored in a bottle away from light and re-standardized periodically.…”

Ruthenium(III)-Catalyzed Oxidation of Vanillin by Anticancer Hexachloroplatinate(IV) Complex in Perchloric Acid Solutions: A Kinetic Study

“…Chloroplatinic acid solution (Johnson Matthey) was used without further purification. Required solution of the oxidant was freshly prepared before each experiment by proper dilution of its original solution which is standardized spectrophotometrically [33]. The solution was stored in a bottle away from light and restandardized periodically.…”