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Tellurium interference with ultratrace platinum analysis during nickel sulphide fire-assay and neutron activation |
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| Authors: | I. McDonald M. Tredoux R. J. Hart |
| Affiliation: | (1) Department of Geological Sciences, University of Cape Town, 7700 Rondebosch, (South Africa);(2) Schonland Research Centre, University of the Witwatersrand, Wits 2050, Johannesburg, (South Africa);(3) Present address: Department of Geology, University of Manchester, M13 9PL Manchester, U.K.;(4) Present address: Council for Geoscience, Private Bag X112, 0001 Pretoria, South Africa |
| Abstract: | The determination of ultratrace concentrations of Pt in rock samples using nickel sulphide fire assay combined with neutron activation analysis (NiS-NAA) is influenced by the presence of Te in the irradiated noble metal concentrate. Interference caused by123mTe on the 158 keV peak of199Au (produced from198Pt) is discussed with reference to a noble metal standard (Wits-1) and sedimentary rocks which generally have low Pt concentrations and high Te/Pt ratios. The importance of a rigorously controlled dissolution of the fire assay button to achieve complete removal of Te is emphasized. |
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