Managing argon interference during measurements of ¹⁸O/¹⁶O ratios in O₂ by continuous-flow isotope ratio mass spectrometry.

ABSTRACT: Monitoring changes in stable oxygen isotope ratios in molecular oxygen allows for studying many fundamental processes in bio(geo)chemistry and environmental sciences. While the measurement of [Formula: see text]O/[Formula: see text]O ratios of [Formula: see text] in gaseous samples can be carried out conveniently and from extracting moderately small aqueous samples for analyses by continuous-flow isotope ratio mass spectrometry (CF-IRMS), oxygen isotope signatures, [Formula: see text]O, could be overestimated by more than 6[Formula: see text] because of interferences from argon in air. Here, we systematically evaluated the extent of such Ar interferences on [Formula: see text]O/[Formula: see text]O ratios of [Formula: see text] for measurements by gas chromatography/IRMS and GasBench/IRMS

SUBMITTER: Bopp CE 

PROVIDER: S-EPMC9314310 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature