A Comprehensive Method for Precise Determination of Re,Os, Ir,Ru, Pt,Pd Concentrations and Os Isotopic Compositions in Geological Samples |
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| Authors: | Zhuyin Chu Yan Yan Zhi Chen Jinghui Guo Yueheng Yang Chaofeng Li Yanbin Zhang |
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| Affiliation: | 1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China;2. College of Earth Sciences, University of Chinese Academy of Sciences, Beijing, China |
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| Abstract: | A comprehensive method for the precise determination of Re, Os, Ir, Ru, Pt and Pd concentrations as well as Os isotopic compositions in geological samples is presented. Samples were digested by the Carius tube method, and the Os was extracted by conventional CCl4 method. The Re, Ir, Ru, Pt and Pd were first subgroup separated from the matrix elements into Re‐Ru, Ir‐Pt and Pd by a 2‐ml anion exchange column. Subsequently, the Re‐Ru was further purified by a secondary 0.25 ml anion exchange column or by microdistillation of Ru using CrO3‐H2SO4 as an oxidant followed by a secondary 0.25 ml anion exchange separation of Re. The Pd and Ir‐Pt were further successively purified by an Eichrom‐LN column to completely remove Zr and Hf, respectively. Rhenium, Ir, Ru, Pt and Pd were individually measured by multi‐collector inductively coupled plasma‐mass spectrometry (MC‐ICP‐MS), except for Ru after microdistillation purification was analysed by negative‐thermal ionisation mass spectrometry (N‐TIMS). The analytical results for peridotite reference material WPR‐1 agree well with the previously published data. Finally, several mafic rock reference materials including TDB‐1, WGB‐1, BHVO‐2, BCR‐2, BIR‐1a and DNC‐1a were analysed for Re‐Os isotopes and platinum‐group element concentrations to test their suitability for certification. |
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| Keywords: | platinum‐group elements Re‐Os isotopes reference materials ion‐exchange interference separation sample inhomogeneity é lé ments du groupe du platine isotopes Re‐Os maté riaux de ré fé rence interfé rence et sé paration d’ é change d'ions hé té rogé né ité de l’ é chantillon |
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