A kinetic model for the oxidation of U(IV) to U(VI) with O2: Determination of stability constants via oxidation kinetic experiments
-
The oxidation of U(IV) to U(VI) with molecular oxygen in acidic aqueous NaClO4 (I=0.5 M) solutions at different temperatures was studied. It was found that the reaction kinetics is a combination of a first-order reaction and an autocatalytic reaction. The speciation of tetravalent uranium is important since it was found that the two first hydrolysed uranium(IV) species are the reactive species under the conditions studied. One problem in interpreting the results comes from the lack of thermodynamic data. However, oxidation kinetic experiments may be a method for determining stability constants for redox sensitive tetravalent actinides. The stability constants for the formation of the first two hydrolysed complexes of U(IV) are reported in this work, e.g. log *β1 (I = 0.5;M, T = 303.15;K)= 1.39±0.42, as compared to the literature value of -1.39±0.20.
© 2015 Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer Str. 145, 81671 München
Articles in the same Issue
- Simultaneous production of 28Mg and 47Ca by high-energy heavy-ion irradiation for applications in biology
- Thermodynamic model for the solubility of PuO2(am) in the aqueous Na+-H+-OH--Cl--H2O-ethylenediaminetetraacetate system
- A kinetic model for the oxidation of U(IV) to U(VI) with O2: Determination of stability constants via oxidation kinetic experiments
- Fluorescence spectroscopy of U(VI) in the presence of perchlorate ions
- Liquid-liquid extraction of plutonium and americium by cekanoic acid from alkaline medium
- Study of the interaction of Pu(IV) and Np(IV,V,VI) with Fe hydroxides to predict the behavior of actinides in environmental media
- Multitracer studies on the effects of model acid rain on the adsorption of trace elements on soils
- Absorption of iodine from aqueous solutions on nuclear reactors alloys
- Pentavalent rhenium-188 dimercaptosuccinic acid: a new kit formulation and its initial evaluation in mice
- Ortho-positronium annihilation parameters in polyvinyl alcohol films with various degrees of polymerization, saponification and crystallinity
Articles in the same Issue
- Simultaneous production of 28Mg and 47Ca by high-energy heavy-ion irradiation for applications in biology
- Thermodynamic model for the solubility of PuO2(am) in the aqueous Na+-H+-OH--Cl--H2O-ethylenediaminetetraacetate system
- A kinetic model for the oxidation of U(IV) to U(VI) with O2: Determination of stability constants via oxidation kinetic experiments
- Fluorescence spectroscopy of U(VI) in the presence of perchlorate ions
- Liquid-liquid extraction of plutonium and americium by cekanoic acid from alkaline medium
- Study of the interaction of Pu(IV) and Np(IV,V,VI) with Fe hydroxides to predict the behavior of actinides in environmental media
- Multitracer studies on the effects of model acid rain on the adsorption of trace elements on soils
- Absorption of iodine from aqueous solutions on nuclear reactors alloys
- Pentavalent rhenium-188 dimercaptosuccinic acid: a new kit formulation and its initial evaluation in mice
- Ortho-positronium annihilation parameters in polyvinyl alcohol films with various degrees of polymerization, saponification and crystallinity
