Fanny Cretaz, Stéphanie Szenknect
Meta-torbernite, Cu(UO2)2(PO4)2/C1 8H2O, is one of the most common secondary minerals resulting from the alteration of pitchblende. The determination of the thermodynamic data associated to this phase appears to be a crucial step toward understanding the origin of uranium deposits or forecasting the fate and transport of uranium in natural media. A parallel approach based on the study of both synthetic and natural samples of meta-torbernite (H3O)0.4Cu0.8(UO2)2(PO4)2/C1 7.6H2O was set up to evaluate its solubility constant. The two solids were first thoroughly characterized and compared using XRD, SEM, X-EDS analyses, Raman spectroscopy, and BET measurements. The solubility constant was then determined in both under- and supersaturated conditions: the obtained value appeared close to logK/C14s;0(298 K) =/C0 52.9 ± 0.1 whatever the type of experiment and the sample considered. The joint determination of Gibbs free energy (DRG/C176(298 K) = 300 ± 2 kJ mol/C0 1) then allowed the calculation of DRH/C176(298 K) = 40 ± 3 kJ mol/C0 1 and DRS/C176(298 K) =/C0 879 ± 7 J mol/C0 1 K/C0 1. From these values, the thermodynamic data associated with the formation of meta-torbernite (H3O)0.4Cu0.8(UO2)2(PO4)2/C1 7.6H2O were also evaluated and found to be consistent with those previously obtained by calorimetry, showing the reliability of the method developed in this work.
@article{3685aab8-fdf3-4509-a1c2-f43f06e1d6ef,
title={Solubility properties of synthetic and natural meta-torbernite},
author={Fanny Cretaz and Stéphanie Szenknect},
year={2013},
language={en}
}TY - JOUR TI - Solubility properties of synthetic and natural meta-torbernite AU - Fanny Cretaz AU - Stéphanie Szenknect PY - 2013 LA - en ER -
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