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Determination of the equilibrium formation constants of two U(VI)-peroxide complexes at alkaline pH
Meca, S.; Martínez Torrents, Albert; Martí Gregorio, Vicenç; Giménez Izquierdo, Francisco Javier; Casas Pons, Ignasi; Pablo Ribas, Joan de
Universitat Politècnica de Catalunya. Departament d'Enginyeria Química
The formation of uranyl-peroxide complexes was studied at alkaline media by using UV-Visible spectrophotometry and the STAR code. Two different complexes were found at a H2O2/U(VI) ratio lower than 2. A graphical method was used in order to obtain the formation constants of such complexes and the STAR program was used to refine the formation constants values because of itscapacity to treat multiwavelength absorbance data and refining equilibrium constants. The values obtained for the two complexes identified [...]At hydrogen peroxide concentrations higher than 10-5 mol dm-3, and in the absence of carbonate, the UO2(O2)2(OH)2 4- complex is predominant in solution, indicating the significant peroxide affinity of peroxide ions for uranium and the strong complexes of uranium(VI) with peroxide.
2012-05-11
Àrees temàtiques de la UPC::Enginyeria química::Química inorgànica::Equilibris químics
Radioactive wastes -- Analysis
Uraniun (VI)
Combustibles nuclears gastats
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