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• W4285588650 startingPage "6177" @default.
• W4285588650 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 and propose simple instrumental modifications for improved Ar and [Formula: see text] separation as well as post-measurement correction procedures for obtaining accurate [Formula: see text]O. We subsequently evaluated the consequences of Ar interferences for the quantification of O isotope fractionation in terms of isotope enrichment factors, [Formula: see text], and [Formula: see text]O kinetic isotope effects ([Formula: see text]O KIEs) in samples where [Formula: see text] is consumed and Ar:[Formula: see text] ratios increase steadily and substantially over the course of a reaction. We show that the extent of O isotope fractionation is overestimated only slightly and that this effect is typically smaller than uncertainties originating from the precision of [Formula: see text]O measurements and experimental variability. Ar interferences can become more relevant and bias [Formula: see text] values by more than [Formula: see text] in aqueous samples where fractional [Formula: see text] conversion exceeds 90%. Practically, however, such samples would typically contain less than 25 [Formula: see text]M of [Formula: see text] at ambient temperature, an amount that is close to the method detection limit of [Formula: see text]O/[Formula: see text]O ratio measurement by CF-IRMS." @default.
• W4285588650 created "2022-07-16" @default.
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• W4285588650 date "2022-07-16" @default.
• W4285588650 modified "2023-10-01" @default.
• W4285588650 title "Managing argon interference during measurements of 18O/16O ratios in O2 by continuous-flow isotope ratio mass spectrometry" @default.
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• W4285588650 doi "https://doi.org/10.1007/s00216-022-04184-3" @default.
• W4285588650 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35841416" @default.
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