A GC-IRMS method for measuring sulfur isotope ratios of carbonyl sulfide from small air samples.

ABSTRACT: A new system was developed for measuring sulfur isotopes δ ³³S and δ ³⁴S from atmospheric carbonyl sulfide (COS) on small air samples of several liters, using pre-concentration and gas chromatography - isotope ratio mass spectrometry (GC-IRMS). Measurements of COS isotopes provide a tool for quantifying the COS budget, which will help towards better understanding climate feedback mechanisms. For a 4 liter sample at ambient COS mixing ratio, ~500 parts per trillion (ppt), we obtain a reproducibility error of 2.1 ‰ for δ ³³S and 0.4 ‰ for δ ³⁴S. After applying corrections, the uncertainty for an individual ambient air sample measurement is 2.5 ‰ for δ ³³S and 0.9 ‰ for δ ³⁴S. The ability to measure small samples allows applica

SUBMITTER: Baartman SL 

PROVIDER: S-EPMC10521041 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature