Extraction of CO2 from air samples for isotopic analysis and limits to ultra high precision delta18O determination in CO2 gas.

@article{Werner2001ExtractionOC,
  title={Extraction of CO2 from air samples for isotopic analysis and limits to ultra high precision delta18O determination in CO2 gas.},
  author={Roland A. Werner and Michael Thadd{\"a}us Rothe and Willi A. Brand},
  journal={Rapid communications in mass spectrometry : RCM},
  year={2001},
  volume={15 22},
  pages={2152-67}
}
The determination of delta18O values in CO2 at a precision level of +/-0.02 per thousand (delta-notation) has always been a challenging, if not impossible, analytical task. Here, we demonstrate that beyond the usually assumed major cause of uncertainty - water contamination - there are other, hitherto underestimated sources of contamination and processes which can alter the oxygen isotope composition of CO2. Active surfaces in the preparation line with which CO2 comes into contact, as well as… CONTINUE READING