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The oxidative dissolution of unirradiated UO2 by hydrogen peroxide as a function of pH RID A-4179-2010

Author:
Clarens, F  de Pablo, J  Casas, I  Gimenez, J  Rovira, M  Merino, J  Cera, E  Bruno, J  Quinones, J  Martinez-Esparza, A  


Journal:
JOURNAL OF NUCLEAR MATERIALS


Issue Date:
2005


Abstract(summary):

The dissolution of non-irradiated UO2 was studied as a function of both pH and hydrogen peroxide concentration (simulating radiolytic generated product). At acidic pH and a relatively low hydrogen peroxide concentration (10(-5) mol dm(-3)), the UO2 dissolution rate decreases linearly with pH while at alkaline pH the dissolution rate increases linearly with pH. At higher H2O, concentrations (10(-3) mol dm(-3)) the dissolution rates are lower than the ones at 10(-5) mol dm(-3) H2O2, which has been attributed to the precipitation at these conditions of studtite (UO(4)(.)4H(2)O, which was identified by X-ray diffraction), together with the possibility of hydrogen peroxide decomposition. In the literature, spent fuel dissolution rates determined in the absence of carbonate fall in the H2O2 concentration range 5 x 10(-7)- 5 x 10(-5) mol dm(-3) according to our results, which is in agreement with H2O2 concentrations determined in spent fuel leaching experiments. (c) 2005 Elsevier B.V. All rights reserved.


Page:
225---231


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