Improved accuracy in high-temperature conversion elemental analyzer δ18O measurements of nitrogen-rich organics.

@article{Hunsinger2012ImprovedAI,
  title={Improved accuracy in high-temperature conversion elemental analyzer δ18O measurements of nitrogen-rich organics.},
  author={Glendon B Hunsinger and Libby A. Stern},
  journal={Rapid communications in mass spectrometry : RCM},
  year={2012},
  volume={26 5},
  pages={554-62}
}
RATIONALE The use of high-temperature conversion (HTC) reduction systems interfaced with isotope ratio mass spectrometers for δ(18)O measurements of nitrogen-containing organic materials is complicated by isobaric interference from (14)N(16)O(+). This ion is produced in the ion source when N(2) reacts with trace oxygen shifting the m/z 30 baseline prior to elution of CO. METHODS We compared adaptations to a typical HTC system (TC/EA) to determine the best method to measure the δ(18)O values… CONTINUE READING