Abstract
The isotopic fractionation between gaseous carbon dioxide and an equilibrated aqueous solution of the gas has been measured at temperatures between 0° and 60 °C for the carbon isotopes and close to 0 °C for the oxygen isotopes.
13C16O2 is slightly less, and12C16O18O slightly more soluble than12C16O2, the actual values for the fractionation,ɛ, being −(1.18−0.0041 ·t)‰ (temperature,t, in °C) for the carbon isotopes and about 0.8‰ at 0°C for the oxygen isotopes.
A theoretical expression is derived for the vapour-solute equilibrium system by treating it in a similar manner as the pure vapour-liquid system. The calculated isotopic fractionation for carbon dioxide, using data on the pure vapour-liquid system, is in satisfactory agreement with the experimental results.
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The measurements were performed by PMG under the supervision of WGM; the theoretical section is by JCV.
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Vogel, J.C., Grootes, P.M. & Mook, W.G. Isotopic fractionation between gaseous and dissolved carbon dioxide. Z. Physik 230, 225–238 (1970). https://doi.org/10.1007/BF01394688
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DOI: https://doi.org/10.1007/BF01394688