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Abundances of Sulfur, Selenium, Tellurium, Rhenium and Platinum‐Group Elements in Eighteen Reference Materials by Isotope Dilution Sector‐Field ICP ‐ MS and Negative TIMS
Author(s) -
Wang Zaicong,
Becker Harry
Publication year - 2014
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/j.1751-908x.2013.00258.x
Subject(s) - chalcogen , selenium , chemistry , platinum group , rhenium , isotope dilution , tellurium , sulfur , analytical chemistry (journal) , platinum , mass spectrometry , inorganic chemistry , crystallography , environmental chemistry , chromatography , catalysis , biochemistry , organic chemistry
Geological reference materials ( RM s) with variable compositions and NIST SRM 612 were analysed by isotope dilution mass spectrometry for bulk rock concentrations of chalcogen elements (sulfur, selenium and tellurium), rhenium and platinum‐group elements ( PGE s: Ru, Pd, Os, Ir and Pt), including the isotope amount ratios of 187 Os/ 188 Os. All concentrations were obtained from the same aliquot after HC l‐ HNO 3 digestion in a high pressure asher at 320 °C. Concentrations were determined after chemical separation by negative TIMS , ICP ‐ MS and hydride generation ICP ‐ MS (Se, Te). As in previous studies, concentrations of the PGE s in most RM s were found to be highly variable, which may be ascribed to sample heterogeneity at the < 1 g level. In contrast, S, Se and Te displayed good precision ( RSD < 5%) in most RM s, suggesting that part of the PGE budget is controlled by different phases, compared with the chalcogen budget. The method may minimise losses of volatile chalcogens during the closed‐system digestion and indicates the different extent of heterogeneity of chalcogens, Re and PGE s in the same sample aliquot. OKUM , SC o‐1, MRG ‐1, DR ‐N and MAG ‐1 are useful RM s for the chalcogens. NIST SRM 612 displays homogenous distribution of S, Se, Te, Pt and Pd in 30 mg aliquots, in contrast with micro‐scale heterogeneity of Se, Pd and Pt.