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A new method to determine the ^17^O isotopic abundance in CO~2~ using oxygen isotope exchange with a solid oxide by S.S. Assonov; C. A. M. Brenninkmeijer is a Chemistry article available to read on EtoBox.

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## Abstract This paper discusses a simple method to determine ^17^O isotope excess or deficiency (‘mass‐independent isotopic composition’) in CO~2~ gas. When applying conventional mass spectrometry of CO~2~ (__m/z__ 44, 45 and 46) to determine the ^17^O/^16^O ratio, the ^13^C/^12^C ratio has to be established separately. This can be achieved by analysing an aliquot of sample CO~2~ before and after subjecting it to oxygen isotope exchange with a pool of oxygen with ‘normal’ ^17^O/^16^O ratio, i.e. with Δ^17^O≡δ^17^O−0.516 × δ^18^O = 0. Cerium oxide has been shown to be practically well suited for the exchange of CO~2~ oxygen; the reagent is safe and does not produce any contamination. The CO~2~‐CeO~2~ exchange reaction has 99.8 ± 0.7% recovery yield. At 650 °C this reaction reaches equilibrium in 30 min and, as tested, results in complete oxygen replacement. Δ^17^O determinations depend on accuracy of CO~2~ delta measurements: the repeatability of ±0.015‰ (1σ) in δ^45^R and δ^46^R deter‐mination relative to the working reference results in an error of Δ^17^O as small as ±0.33‰. Such a precision is sufficient for Δ^17^O determination in stratospheric CO~2~. The calculated Δ^17^O valu

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Author

S.S. Assonov; C. A. M. Brenninkmeijer

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0951-4198)

Published

2001

Language

EN

Field

Chemistry (Physical Sciences)