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Oxygen isotope corrections for online δ 34 S analysis
Author(s) -
Fry Brian,
Silva Steven R.,
Kendall Carol,
Anderson Richard K.
Publication year - 2002
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.651
Subject(s) - chemistry , isotopes of oxygen , isotope , oxygen , isotope analysis , oxygen isotope ratio cycle , stable isotope ratio , isotopic ratio , oxygen 18 , analytical chemistry (journal) , isotope ratio mass spectrometry , yield (engineering) , mass spectrometry , delta , kinetic isotope effect , radiochemistry , environmental chemistry , deuterium , nuclear physics , nuclear chemistry , chromatography , geology , physics , oceanography , materials science , organic chemistry , aerospace engineering , engineering , metallurgy
Elemental analyzers have been successfully coupled to stable‐isotope‐ratio mass spectrometers for online measurements of the δ 34 S isotopic composition of plants, animals and soils. We found that the online technology for automated δ 34 S isotopic determinations did not yield reproducible oxygen isotopic compositions in the SO 2 produced, and as a result calculated δ 34 S values were often 1–3‰ too high versus their correct values, particularly for plant and animal samples with high C/S ratio. Here we provide empirical and analytical methods for correcting the S isotope values for oxygen isotope variations, and further detail a new SO 2 ‐SiO 2 buffering method that minimizes detrimental oxygen isotope variations in SO 2 . Published in 2002 by John Wiley & Sons, Ltd.