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

1 July 1970

journal article
research article
Published by SAGE Publications in Applied Spectroscopy

Vol. 24 (4) , 415-418
https://doi.org/10.1366/000370270774371525

Abstract

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 OsCl₆ 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

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