Abstract
A rapid and accurate method is described for the determination of iridium in platiniferous materials.The method is based on the classical fire-assay collection of the noble metals into a lead button and the subsequent complete dissolution of lead with perchloric acid after heating at 160—180°C. Iridium remains totally unattacked by the parting acid whereas Pt, Pd, Rh and Au pass completely into the perchloric acid-lead perchlorate solution. After filtration, the residue is fused with sodium peroxide, Ru and Os are removed by boiling with perchloric acid, and iridium is finally determined photometrically or by atomic-absorption spectrometry. The proposed method shows a universal applicability and provides what is perhaps the simplest isolation procedure for iridium.
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