Is there oxygen isotope exchange between dissolved CO2 and H2O?

If you had a sample containing an elevated concentration of $$\ce{H2^{18}O}$$, and bubbled $$\ce{C^{16}O2}$$ through it, would some of the oxygen-18 isotope be transferred from water to carbon dioxide?

I am aware that this occurs with hydrogen isotopes and am curious if it works for larger and heavier atoms such as oxygen.

• Yes, absolutely. In (at least) aqueous geochemistry, the phenomena is used to determine source rock and age for various parts of the hydrologic system. See this publication for more information. Mar 24, 2022 at 2:24
• It is quite obvious it does, via its equilibrium reactions with water, forming carbonic acid and bicarbonate/carbonate ions. Mar 24, 2022 at 5:21
• @Poutnik, I realized that as I read the paper Todd recommended. I wonder if it would still occur if the molecule did not dissociate. Like if the gas were ethanol instead. Mar 24, 2022 at 5:33
• @ericnutsch It doesn't have to dissociate, but a reaction is obligatory. With alcohol, if pH was high enough, substitution would be possible. Mar 24, 2022 at 14:48
• Ethanol does not exchange with water in weakly acidic conditions; see the article by J. Dunbar, doi.org/10.1524/zpch.1982.130.2.247. Mar 24, 2022 at 15:34

$$\ce{CO2 + H2O <=> \color{blue}{H2CO3}}$$
• That depends on if you allow tautomerization from the direct adduct $\ce{H2O - CO2}$ to $\ce{HO - C(O)OH}$. With the tautomerization, the "central" oxygen atom would come from the carbon dioxide, but the hydroxyl oxygens would come from both reactants and thus mixing would occur. But without the tautomerizaton, the oxygen atoms cannot mix because the water and carbon dioxide oxygens never become equivalent. Mar 24, 2022 at 22:09
• Hmmmm... just guessing here: $\ce{CO2 ->[H2O] CO2 (aq)}$, $\ce{CO2 (aq) + H2O <=> H+ (aq) + HCO3+ (aq)}$, $\ce{HCO3+ (aq) <=> H+ (aq) + CO2^2+ (aq)}$. The Grotthuss mechanism accounts for the mobility of protons, and carbonic acid will most likely be in the smallest concentration of all involved species. Like actually lower that $\ce{2 H2O (aq) <=> OH- (aq) + H3O+ (aq)}$. Mar 24, 2022 at 22:42