Abstract
A new scheme is proposed for the quantitative recovery of ruthenium and osmium collected in lead. The lead button is parted with perchloric acid in the presence of a little acetic acid, after heating at 160—180°C. Ruthenium remains totally undissolved;some osmium remains insoluble but some volatilizes and is collected in an alkaline solution. Platinum, palladium and rhodium are completely dissolved in the lead perchloric acid solution, and are removed by simple filtration. After fusion of the residue with sodium peroxide, the solution is combined with the alkaline osmium solution, and ruthenium and osmium oxides are distilled from a bromate—sulphuric acid medium, prior to their spectrophotometric determination. The method provides satisfactory recoveries, with relative standard deviations of 1.45% (Ru) and 6 3% (Os).
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