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Revised δ 34 S reference values for IAEA sulfur isotope reference materials S‐2 and S‐3
Author(s) -
Mann Jacqueline L.,
Vocke Robert D.,
Kelly W. Robert
Publication year - 2009
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.3977
Subject(s) - chemistry , isotope , sulfur , mass spectrometry , analytical chemistry (journal) , thermal ionization mass spectrometry , systematic error , value (mathematics) , radiochemistry , ionization , nuclear physics , environmental chemistry , chromatography , statistics , ion , physics , mathematics , organic chemistry
Revised δ 34 S reference values with associated expanded uncertainties (95% confidence interval (C.I.)) are presented for the sulfur isotope reference materials IAEA‐S‐2 (22.62 ± 0.16‰) and IAEA‐S‐3 (−32.49 ± 0.16‰). These revised values are determined using two relative‐difference measurement techniques, gas source isotope ratio mass spectrometry (GIRMS) and double‐spike multi‐collector thermal ionization mass spectrometry (MC‐TIMS). Gas analyses have traditionally been considered the most robust for relative isotopic difference measurements of sulfur. The double‐spike MC‐TIMS technique provides an independent method for value‐assignment validation and produces revised values that are both unbiased and more precise than previous value assignments. Unbiased δ 34 S values are required to anchor the positive and negative end members of the sulfur delta ( δ ) scale because they are the basis for reporting both δ 34 S values and the derived mass‐independent Δ 33 S and Δ 36 S values. Published in 2009 by John Wiley & Sons, Ltd.