EXTRACTION-SPECTROPHOTOMETRIC INVESTIGATIONS OF PALLADIUM AND PLATINUM REACTIONS WITH CALCON AND CALMAGIT AND SEPARATION OF THESE METALS BY EXTRACTION CHROMATOGRAPHY

Extraction of palladium and platinum from aqueous solutions containing calcon or calmagit in the pH range 2-6 (at room temperature or after heating the solutions on the boiling water bath) into chloroform solutions of Aliquat 336 or tri-n-octylamine (TOA) hydrochloride was investigated. The distinctly higher extraction of palladium than platinum was found, especially after 1 h heating of the solutions at pH 3 on the boiling water bath. The composition of the palladium complex determined by Job's method was found to be of the PdL2 type. Mixture of palladium and platinum was separated by extraction chromatography (after compexation of both metals with calmagit) using columns packed with silica gel treated with TOA hydrochloride.