Determination of Platinum‐Group Elements and Re‐Os Isotopes using ID‐ICP‐MS and N‐TIMS from a Single Digestion after Two‐Stage Column Separation |
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Authors: | Jie Li Xiao‐Ying Jiang Ji‐Feng Xu Li‐Feng Zhong Xuan‐Ce Wang Gui‐Qin Wang Pei‐Pei Zhao |
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Institution: | 1. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, , Guangzhou, 510640 China;2. University of Chinese Academy of Sciences, , Beijing, 100049 China;3. Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, , Guangzhou, 510301 China;4. Department of Applied Geology, ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and The Institute for Geoscience Research (TIGeR), Curtin University, , Perth, 6845 Australia |
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Abstract: | We report an improved procedure for the determination of the platinum‐group elements (PGE) and Re, and Os isotopes from a single sample aliquot by isotope dilution (ID) using inductively coupled plasma‐mass spectrometry (ICP‐MS) and negative thermal ionisation mass spectrometry (N‐TIMS), respectively. A two‐stage column method was used to purify PGE‐Re from their sample matrix and interfering elements (e.g., Mo, Zr and Hf) after Os had been separated by CCl4 solvent extraction. The first column separation step used cation exchange resin (AG50W‐X8) to concentrate PGE‐Re and some potential interfering elements (e.g., Mo, Zr and Hf). In the second step, N‐benzoyl‐N‐phenylhydroxylamine (BPHA) extraction resin was used to separate PGE‐Re from the remaining interfering elements, which all remained strongly absorbed to the resin. The method was used to determine the PGE and rhenium, and Os isotope ratios in a range of geochemical reference materials (TDB‐1, WGB‐1, BHVO‐2 and UB‐N). The obtained results agree well with those previously published. This new method enables PGE‐Re abundances and Os isotopic ratios to be determined on the same sample digestion, and circumvents the problems created by sample heterogeneity when comparing PGE and Re‐Os isotope data. |
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Keywords: | platinum‐group elements Re‐Os isotopes N‐benzoyl‐N‐phenylhydroxylamine extraction resin cation exchange resin ICP‐MS N‐TIMS é lé ments du groupe du platine isotopes Re‐Os ré sine d'extraction N‐benzoyl‐N‐phé nylhydroxylamine ré sine é changeuse de cations ICP‐MS N‐TIMS |
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