Abstract
A method is described for the wet analysis of the lead-noble metals button which is parted with perchloric acid after heating at 160–180°C, thus resulting in the complete dissolution of platinum, palladium, rhodium, and gold, indium remains totally unattacked. Quantitative group precipitation of the precious metals from the diluted lead perchlorate filtrate solution is possible with 2-mercaptobenzothiazole as precipitant. The noble metals precipitated are isolated by filtration and are easily determined. The proposed procedure is rapid, precise, and applicable to a wide variety of platiniferous materials.
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