13C/12C partitioning and kinetics of CO2 absorption by hydroxide buffer solutions

Details 13C/12C partitioning and kinetics of CO2 absorption by hydroxide buffer solutions 13C/12C partitioning and kinetics of CO2 absorption by hydroxide buffer solutions

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..80..130u&link_type=abstract

Earth and Planetary Science Letters, Volume 80, Issue 1-2, p. 130-134.

Computer Science

1

Scientific paper

Absorption of CO2 gas into a borate buffer solution is a linear function of time. The measured absorption rate log r = -10.33 (mol cm-2 s-1) compares well to a value calculated from the diffusion constant of CO2(aq) and the rate constant for the reaction of CO2(aq) with OH-. The stable carbon-isotope composition of the dissolved carbonate is constant as function of time, and is depleted in 13C by 19.5‰ with respect to the gas phase. The kinetic fractionation due to diffusion is [(13D/12D)0.5 - 1] × 103 = - 0.7/%, while that caused by the chemical reaction is [(13k/12k)0.5 - 1] × 103 = - 18.8/%. These values have to be taken into account if a borate buffer is used for sample concentration techniques in order to deduce the carbon-isotope composition of CO2(g). Absorption of CO2 into a Ba(OH)2 solution is a linear function of time, too. But the absorption rate varies with the experimental boundary conditions. The precipitated BaCO3 is depleted in 13C with respect to the gas phase. However, δ13C values are not constant and decrease as a function of time.

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