Abstract
The complexes formed by rhodium(III) and tin(II), and by rhodium(III) in hydrochloric acid solutions and their extractability by tri- n-octylamine have been studied. Hydrochloric acid solutions of rhodium (III) developed a red colour when heated with tin(II) chloride, but a yellow species was obtained by dilution of solutions of the red complex with water. By heating rhodium(III) with tin(II) in 7–-11.6 M hydrochloric acid, the yellow species was obtained directly in aqueous solution. A procedure was developed for the extraction of the yellow complex from aqueous solution with tri- n-octylamine. A mechanism for the extraction of both species is proposed. The extractabilities of the Rh(III)-HCl. Pt(IV)-HCl and Pd(II)-HCl systems by tri- n-octylamine depend on the hydrochloric acid concentration; rhodium could be separated from platinum and palladium leading to a sensitive, reproducible analytical method for the determination of rhodium by means of the extracted yellow complex in tri- n-octylamine.
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