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• W2021568765 abstract "Inductively coupled plasma-mass spectrometry (ICP-MS) is one of the most sensitive techniques for the determination of the platinum-group elements (PGE's: Ru, Rh, Pd, Os, Ir, Pt) and Au. Published methods have demonstrated the application of ICP-MS to the determination of these precious metals in a wide range of geological materials following acid digestion with or without fire-assay preconcentration. However, existing methods require complex chemical manipulation to ensure the complete digestion of refractory minerals and the retention of volatile elements, particularly Os. In this paper we describe a new approach to the determination of the PGE's and Au by ICP-MS involving the introduction of solid samples as suspended slurries. Samples are ground to <5 μm using zirconia beads in polypropylene bottles. An acidified dispersing agent (tetrasodium pyrophosphate Na4P2O7 and aqua regia) ensures that grains are maintained in suspension during grinding and leads to partial digestion of the material. Subsamples are introduced into the ICP-MS as dilute (<2000 μg ml−1) aqueous slurries suspended in Na4P2O7. Modified instrumental conditions including increased forward power and nebuliser gas flow-rate, combined with a 3-mm torch injector tube, ensure no loss in analytical performance when compared to the analysis of simple dilute acid media. Calibration is achieved using a blank and a Na4P2O7 standard spiked with appropriate amounts of commercial single-element aqueous standard solutions. Limits of quantitative analysis for the method are 0.04-0.2 μg g−1 in samples. Estimates of analytical reproducibility indicate 2–30% relative standard deviations (RSD's) for most elements in most materials. Analytical accuracy has been assessed by the determination of Ru, Rh, Pd, Os, Ir, Pt and Au in a range of well-characterised international PGE reference materials, and results obtained are in good agreement with reference values for all elements in all samples. The technique offers a means for the rapid determination of the precious metals in mineral separates, PGE ores and allied industrial materials." @default.
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• W2021568765 date "1993-02-01" @default.
• W2021568765 modified "2023-09-26" @default.
• W2021568765 title "Determination of the platinum-group elements and gold in solid samples by slurry nebulisation ICP-MS" @default.
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• W2021568765 doi "https://doi.org/10.1016/0009-2541(93)90149-d" @default.
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