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• W2944407816 endingPage "1380" @default.
• W2944407816 startingPage "1363" @default.
• W2944407816 abstract "Rationale Determination of δ 17 O values directly from CO 2 with traditional gas source isotope ratio mass spectrometry is not possible due to isobaric interference of 13 C 16 O 16 O on 12 C 17 O 16 O. The methods developed so far use either chemical conversion or isotope equilibration to determine the δ 17 O value of CO 2 . In addition, δ 13 C measurements require correction for the interference from 12 C 17 O 16 O on 13 C 16 O 16 O since it is not possible to resolve the two isotopologues. Methods We present a technique to determine the δ 17 O, δ 18 O and δ 13 C values of CO 2 from the fragment ions that are formed upon electron ionization in the ion source of the Thermo Scientific 253 Ultra high‐resolution isotope ratio mass spectrometer (hereafter 253 Ultra). The new technique is compared with the CO 2 ‐O 2 exchange method and the 17 O‐correction algorithm for δ 17 O and δ 13 C values, respectively. Results The scale contractions for δ 13 C and δ 18 O values are slightly larger for fragment ion measurements than for molecular ion measurements. The δ 17 O and Δ 17 O values of CO 2 can be measured on the 17 O + fragment with an internal error that is a factor 1–2 above the counting statistics limit. The ultimate precision depends on the signal intensity and on the total time that the 17 O + beam is monitored; a precision of 14 ppm (parts per million) (standard error of the mean) was achieved in 20 hours at the University of Göttingen. The Δ 17 O measurements with the O‐fragment method agree with the CO 2 ‐O 2 exchange method over a range of Δ 17 O values of −0.3 to +0.7‰. Conclusions Isotope measurements on atom fragment ions of CO 2 can be used as an alternative method to determine the carbon and oxygen isotopic composition of CO 2 without chemical processing or corrections for mass interferences." @default.
• W2944407816 created "2019-05-16" @default.
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• W2944407816 date "2019-08-05" @default.
• W2944407816 modified "2023-10-17" @default.
• W2944407816 title "Determination of the triple oxygen and carbon isotopic composition of CO₂ from atomic ion fragments formed in the ion source of the 253 Ultra high‐resolution isotope ratio mass spectrometer" @default.
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• W2944407816 doi "https://doi.org/10.1002/rcm.8478" @default.
• W2944407816 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6771542" @default.
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• W2944407816 hasPublicationYear "2019" @default.
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