Speciation of uranium(VI) at the solid/solution interface: sorption modeling on zirconium silicate and zirconium oxide
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C. Lomenech
Summary
In the field of nuclear waste storage, knowledge of the sorption behavior of radionuclides onto mineral surfaces is of fundamental importance in order to evaluate environmental impacts. We have studied uranyl ion sorption mechanisms onto zirconium silicate and zirconium oxide with a double approach, coupling both macroscopic and structural investigations. The spectroscopic results, reported in a previous paper, allowed a complete determination of the different species involved in the studied sorption reactions. This paper presents the results of the macroscopic part of the study. Surface characterizations of the solids were first carried out: determination of the pH of the point of zero charge, of the surface site densities and of the surface acidity constants. The experimental retention data were then interpreted in terms of a constant capacitance model using the FITEQL code. Results from structural investigation were used to constrain the modeling. This coupled approach led to accurate reactions stoichiometry and associated sorption constants values, since they were determined with respect to different experimental results, both macroscopic and microscopic.
© 2003 Oldenbourg Wissenschaftsverlag GmbH
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- Limiting transport properties of lanthanide and actinide ions in pure water
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Articles in the same Issue
- Chemical identification and properties of element 112
- Einsteinium chemistry in the gas phase: exploring the divalent character of heavy actinides
- Temperature dependence and effect of oxide anion on the americium chemistry in the molten LiCl-KCl eutectic
- Speciation of uranium(VI) at the solid/solution interface: sorption modeling on zirconium silicate and zirconium oxide
- A kinetic model of the oxidative dissolution of brannerite, UTi2O6
- Limiting transport properties of lanthanide and actinide ions in pure water
- Determination of Mo(VI), Ru(III), Re(VII) and NO3- in the solutions of nuclear fuel cycle by capillary electrophoresis
- Application of microanalytical techniques to the study of aqueous ion sorption phenomena on mineral surfaces
