Thermodynamic model for the solubility of PuO2(am) in the aqueous Na+-H+-OH--Cl--H2O-ethylenediaminetetraacetate system
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The solubility of PuO2(am) was determined in the aqueous Na+ H+-OH--Cl--H2O-ethylenediaminetetraacetate (EDTA) system as a function of pH (1 to 13.5) and EDTA concentrations (0.00001 to 0.093 M) to determine PuEDTA complexes important in a wide range of pH values and EDTA concentrations. The solubility studies were carried out as a function of time and show, as expected, that steady-state/equilibrium in this system is reached rapidly (<7 days). The aqueous Pu oxidation states were determined by X-ray absorption near edge spectroscopy and solvent extraction. The aqueous Pu(IV) concentrations in equilibrium with PuO2(am) at fixed concentrations of EDTA (0.0001 or 0.001;M) as a function of pH, and at fixed pH (∼9), and as a function of EDTA were interpreted using the Pitzer ion-interaction model. The model was developed based on a subset of the experimental data and was validated against the remaining, more extensive data not used in model development. The log K0 values for the formation of Pu(OH)xEDTAx- according to the generalized reaction (Pu4+ + xOH+EDTA4- ↔ Pu(OH)xEDTA-x) were determined to be 36.44±0.35, 44.78±0.35, and 49.80±0.35 for x=1, 2, and 3, respectively, when log;K0 of -56.85 for (PuO2(am)+2H2O harr; Pu4++4OH-) is used.
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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
