R4: Mineral sciences of the Earth surface

[R4-11] Solubility of Amorphous Magnesium Carbonate at Low Temperature

*Kitajima KITAJIMA Takuma¹, Fukushi Keisuke², Yasuhito Sekine³, Masahiro Yoda⁴, Baasansuren Gankhurel¹, Davaadorj Davaasuren⁵, Yoshio Takahasi⁶ (1. Kanazawa Univ. Sic., 2. K-INET, 3. Tokyo Univ. Sic, 4. ELSI, 5. National University of Mongolia, 6. Tokyo Univ. )

Keywords:Amorphous Magnesium Carbonate, Solubility

In closed lake environments such as alkaline saline lakes, it has been reported that Mg carbonate derived from atmospheric CO₂ is constantly precipitated. In closed lakes, amorphous Mg carbonate (AMC), which is unstable and a precursor of crystalline carbonate, is precipitated. Studies on CO₂ fixation in closed lakes are scarce and the details aren’t clear. Thermodynamic data of AMC are also scarce, and more research is needed to understand the fixation. In this study, we estimated the solubility of AMC at low temperature and compared it with the results of winter closed lake surveys.