Abstract
A fire-assay procedure for determining platinum, palladium, rhodium or iridium in the nitric acid parting solution from a lead button is described. Palladium is the only metal which is completely attacked by the parting solution; traces of platinum and rhodium are also dissolved. The presence of copper in the lead button has been found to encourage the dissolution of both platinum and iridium in the nitric acid parting solution ; rhodium remains unaffected. Ion-exchange and precipitation procedures for separating palladium from lead are also included. Efforts have been made to identify the source of iridium loss which is a characteristic of classical fire assay collections.
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