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Simultaneous Determination of Eight Precious Metal Elements in Black Rock Samples
Pages: 66-71
Year: Issue:  3
Journal: Precious Metals

Keyword:  analytical chemistryblack rockprecious metalstin fire assayinductively coupled plasma mass spectrometry (ICP-MS);
Abstract: The precious metal elements are difficult both to be identified and to be determined by conventional nickel sulphide fire-assay because the black rock contains large amounts of organic carbon and these elements are existed as ultrafine dispersion. A method to determine eight precious metal elements simultaneously by ICP-MS after enrichment with tin fire-assay was reported. Tin was used as the scavenger. The assay ingredients were adjusted to elevate the melting temperature. The flux and covering agent were added. Based on the determination results, the detection limits (ng/g) were 27.8 for Ag, 0.11 for Au and Pd, 0.10 for Pt, and 0.02 for Rh, Ru, Ir and Os. The recovery rate ranged 88%~120%. It can be applied to the determination of precious metal elements in black rock and other minerals samples.
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