Accuracy of Thermodynamic Databases for Hydroxyapatite Dissolution Constant
We report that discrepancies have been noted in the solubility constant values of calcium phosphate minerals between various databases employed in widely-used aqueous speciation calculation software programs. This can cause serious errors in the calculated speciation of waters using these software programs. The aim of the present communication was to bring to light these discrepancies. Experimental determinations of the hydroxyapatite solubility product vary by as much as ten orders of magnitude as a result of experimental challenges related to the presence of impurities in the hydroxyapatite used, incongruent dissolution and the contamination of solutions with dissolved carbon dioxide. Finally, it is suggested that the value used in the database Thermo.dat is consistent with experimental data devoid of common experimental problems, while other common databases use values that lead to a vastly overestimated solubility of hydroxyapatite.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 1593271
- Report Number(s):
- BNL-213548-2020-JAAM
- Journal Information:
- Astrobiology, Vol. 20, Issue 1; ISSN 1531-1074
- Publisher:
- Mary Ann Liebert, Inc.Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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