Abstract
An integrated scheme is proposed for the determination of all six platinum-group metals and gold from a single lead collector button. The button is parted with perchloric acid and acetic acid after heating at 160–180°C. Iridium and ruthenium remain unattacked as the metals together with most of the osmium; some osmium is volatilized and collected in alkali. Pt, Pd, Rh and Au pass completely into the lead perchlorate filtrate, from which they are quantitatively recovered by precipitation with 2-mercaptobenzothiazole. Ru and Os are separated by distillation, whereas Ir is recovered from the residual still liquid by solvent extraction. Comparative results on the recoveries of the precious metals in various platiniferous materials by the proposed method, and the lead cupellation, tin collection and nickel sulphide collection schemes, show that the wet-chemical analysis of the lead button yields the highest recoveries in all cases.
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