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Direct Spectrographic Analysis for Platinum, Palladium, and Rhodium in Gold Beads from Fire Assay

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Platinum, palladium, and rhodium are determined by direct spectrographic analysis of a 4 mg gold bead obtained by fire assay fusion and cupellation. The weighed bead is placed into a graphite electrode containing 2 mg of (NH4)2 OsCl5 which stabilizes the platinum volatilization and is burned in a 15 A dc arc in an argon–oxygen atmosphere. Detection limits for a sample of one assay ton are 5 ppb for Pt and less than 1 ppb for Pd and Rh.

Keywords: Analysis for Pt, Pd, and Rh in geological materials; Fire assay analysis; Optical emission spectroscopy

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370270774371525

Affiliations: U. S. Geological Survey, Washington, D. C. 20242

Publication date: July 1, 1970

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