Improving the accuracy of δ < sup > 18 < /sup > O and δ < sup > 17 < /sup > O values of O < sub > 2 < /sub > measured by continuous-flow isotope-ratio mass spectrometry with a multipoint isotope-ratio calibration

CONCLUSIONS: No significant bias is introduced on the δ18 O scale when applying a one-point calibration with O2 from ambient air during O2 isotope analysis. Both O2 formation and consumption experiments, however, indicate a δ17 O scale compression. Consequently, δ17 O values cannot be measured accurately by GC/IRMS with a one-point calibration without determining the δ17 O scale correction factor, e.g. with the O2 formation experiments described here.PMID:38073201 | DOI:10.1002/rcm.9652
Source: Rapid Communications in Mass Spectrometry : RCM - Category: Chemistry Authors: Source Type: research