Spectrophotometric determination of platinum after extraction of thestannous-chloro complex by high molecular weight amines

Abstract

An investigation of the complex formed between platinum(IV) and tin(II) in hydrochloric acid solutions has been carried out, and its extractibility by various long-chain high molecular weight amines (HMWA) in organic solvents examined. The orange coloured platinum(IV)-tin(II) complex is quantitatively extractable from an aqueous phase into an organic phase of a wide range of high molecular weight amines in chloroform or benzene. On the basis of this extractability a method has been developed for the spectrophotometric determination of platinum in the presence of many other elements. Comparison of the absorption spectra of the coloured species in the aqueous and amine phases indicates the presence of the same absorption species in each medium. The extractability of the complex by HMWA suggests that the coloured species is anionic and not cationie as reported by earlier authors.