The uptake of selenite in calcite revealed by X-ray absorption spectroscopy and quantum chemical calculations

• Published in: The Science of the total environment 2022-01, Vol.802, p.149221-149221, Article 149221
• Main Authors: Yokoyama, Yuka, Qin, Hai-Bo, Tanaka, Masato, Takahashi, Yoshio
• Format: Article
• Language: English
• Subjects: Calcite; Incorporation; Molecular-scale mechanism; Quantum chemical calculations; Selenium (Se); X-ray absorption fine structure (XAFS)
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2021.149221

Selenium (Se) is an important trace element in the environment, but the interaction of Se with calcite that may control the fate and geochemical behavior of Se is not fully understood. In this study, the molecular-scale mechanism for the uptake of selenite in calcite was investigated by a combination of laboratory experiments, extended X-ray absorption fine structure (EXAFS) spectroscopy, and quantum chemical calculations. Results showed that selenite can be largely distributed to calcite at circumneutral pH. The local structure of Se in calcite obtained from EXAFS analyses, in combination with quantum chemical calculations, demonstrated that selenite can be incorporated into calcite by substituting for the carbonate, and that the geometric incompatibility of selenite could be accommodated by a slight expansion of crystal volume. The findings from this study suggest that calcite could be a potential Se sink, providing an important insight into the understanding of the mobility and geochemical behavior of Se in the subsurface environments particularly in the groundwater system. [Display omitted] •Selenite can be incorporated into calcite by substituting for the carbonate site.•Se(IV) incorporation into calcite can be accommodated by a slight crystal expansion.•Calcite could be a potential sink of Se in the groundwater system.