Mohammadian et al. (2023): Probing Solubility and pH of CO2 in aqueous solutions: Implications for CO2 injection into oceans

Erfan Mohammadian, Fahimeh Hadavimoghaddam, Mahdi Kheirollahi, Mehdi Jafari, Xu Chenlu, Bo Liu IN: Journal of CO2 Utilization 71, 102463, https://doi.org/10.1016/j.jcou.2023.102463

In the current study, the authors experimentally measure the pH and solubility at pressures up to 400 atm, temperatures between 283 and 298 K, and different aqueous solutions in a high-pressure autoclave reactor. The results indicated that increasing pressure increases the solubility of CO₂ in aqueous solutions, resulting in lower pH values. In contrast, increasing salinity and temperature lowers the solubility and, as a result, increases the system’s pH. Among all the tested aqueous solutions, the synthetic seawater mimicked that of a potential injection point in the South China sea, exhibiting the highest salting-out effect and, therefore, the lowest solubility (i.e., the highest pH).

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