2022/07/14 by Yongheum Jo, Jun-Yeop Lee, Jong-Il Yun
Chemical Engineering · Chemistry · Engineering · #Chemical and Physical Properties in Aqueous Solutions #Metal Extraction and Bioleaching #Radioactive element chemistry and processing
paper · doi:10.1515/ract-2021-1133
crossref issued 2022/07/14 · crossref published 2022/07/14 · crossref published-online 2022/07/14 · openalex publication_date 2022/07/14 · crossref created 2022/07/14 · crossref published-print 2022/11/25 · crossref deposited 2023/04/02 · openalex created_date 2025/10/10 · crossref indexed 2026/07/29 · openalex updated_date 2026/07/30
Abstract This review provides an overview of the chemical thermodynamics on ternary earth-alkaline metal-actinyl-tricarbonate systems (i.e., M-AnO 2 -CO 3 , M = Mg, Ca, Sr, and Ba) and discusses the aqueous complexation and dissolution/precipitation equilibrium for these ternary aqueous systems. The aqueous ternary U(VI) carbonate species are remarkably predominant in the U(VI) speciation under natural environmental conditions at ambient temperature and moderate ionic strength condition, while the omnipresence, according to recent studies, would be hindered by an increase in temperature and ionic strength. With respect to the ternary solid U(VI) carbonate phases, most of the previously reported data have been focused on physical properties and thus a notable lack of available data on chemical thermodynamic properties, i.e., solubility product constant, has been identified. Nevertheless, substantial influences of these ternary M-AnO 2 -CO 3 systems on the aqueous speciation and the solubility limiting phase under the natural environmental condition are taken into account according to the thermodynamic calculation. The authors point out that the completeness of the chemical thermodynamic model for predicting the chemical behavior of actinides in nature can be further improved on the basis of a sufficient understanding of ternary M-AnO 2 -CO 3 systems.