Title: Comment on "First experimental determination of the solubility constant of coffinite" [Geochim. Cosmochim. Acta 181 (2016) 36-53]
Citation: GEOCHIMICA ET COSMOCHIMICA ACTA vol. 212 p. 372 - 373
Publication Year: 2017
JRC N°: JRC102848
ISSN: 0016-7037
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC102848
DOI: 10.1016/j.gca.2017.03.018
Type: Articles in periodicals and books
Abstract: Coffinite - USiO4 - is a key mineral for the modelling of the chemistry of ura-nium in silica-rich rocks. It is of particular interest for the modelling of the final storage of used nuclear fuel in deep geological respositories, as coffinite may be the solubility-controlling solid phase for uranium. This was extensively discussed by Szenknect et al. (2016) in a recent publication of the determination of the solubility constant of coffinite. The availability of pure USiO4 samples made it possible for the rst time to accurately determine the solubility of this phase in aqueous solution (under-saturated conditions in 0.1 mo lL-1 HCl). The study by Szenknect et al. (2016) is very extensive and in combination with the calorimetric determination of the enthalpy of formation of USiO4 from the same material batch (Guo et al., 2015), allows a re-assessment of the thermodynamic properties of this phase, revising the values from the OECD/NEA review in 1992 (Grenthe et al., 1992) that were based on estimated values for the Gibbs energy of formation of USiO4 by Brookins (1975) and the standard entropy by Langmuir (1978).
JRC Directorate:Nuclear Safety and Security

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