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Discrepancies in thorium oxide solubility values: a new experimental approach to improve understanding of oxide surface at solid/solution interface
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Johan Vandenborre
Published/Copyright:
September 25, 2009
Abstract
The solubility of ThO2(cr) was studied since many years but a large discrepancy in solubility values is noticed in the literature. The present work suggests that this discrepancy is related to differences in the surface properties of thorium oxide.
To understand the role of surface properties on solubility values, we conducted experiments with ThO2(cr) spheres with reproducable surface properties. Batch dissolution experiments were conducted in 0.01 M NaCl solution at pH=3.0 and 4.0 for periods of time up to 270 days. The solutions were spiked with 229Th to determine precipitation (sorption) rates of thorium, while dissolution rates were determined by measuring 232Th released from ThO2(cr) spheres. We assume that 229Th atoms are exchanged only with active sites involved in Th-dissolution. Using 229Th as local sensor of attachement and detachment processes at the ThO2(cr) surface under close-to-equilibrium conditions, allows to assess surface reactivity of the solid during solubility experiments.
Keywords: ThO2(cr); Solubility; Surface properties; Solid /solution interface; Dissolution properties
Published Online: 2009-09-25
Published in Print: 2008-11
© by Oldenbourg Wissenschaftsverlag, Nantes cedex 3, Germany
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Keywords for this article
ThO2(cr);
Solubility;
Surface properties;
Solid /solution interface;
Dissolution properties
Articles in the same Issue
- Preface
- Discrepancies in thorium oxide solubility values: a new experimental approach to improve understanding of oxide surface at solid/solution interface
- Modeling plutonium solubility for Yucca Mountain performance assessment
- Uranium/technetium separation for the UREX process – synthesis and characterization of solid reprocessing forms
- UO2 dissolution in the presence of hydrogen peroxide at pH>11
- Solubility of Zr(IV), Th(IV) and Pu(IV) hydrous oxides in CaCl2 solutions and the formation of ternary Ca-M(IV)-OH complexes
- A TRLFS study of Cm(III) hydroxide complexes in alkaline CaCl2 solutions
- Thermodynamic interpretation of neptunium coprecipitation in uranophane for application to the Yucca Mountain repository
- Structural investigation of coprecipitation of technetium-99 with iron phases
- Synthesis, crystallographic characterization, and conformational prediction of a structurally unique molecular mixed-ligand U(VI) solid, Na6[UO2(O2)2(OH)2](OH)2·14H2O
- Thermodynamic study on the U(VI) complexation with dicarboxylates by calorimetry
- A cryogenic fluorescence spectroscopic study of uranyl carbonate, phosphate and oxyhydroxide minerals
- A spectroscopic study of the effect of ligand complexation on the reduction of uranium(VI) by anthraquinone-2,6-disulfonate (AH2DS)
- The relationship of monodentate and bidentate coordinated uranium(VI) sulfate in aqueous solution
- Hydrolysis constants of tetravalent neptunium by using solvent extraction method
- Leaching of a zirconolite ceramic waste-form under proton and He2+ irradiation
- Oxidative dissolution of Tc(IV)O2·nH2O colloids by sonolysis
- Technetium reduction and reoxidation behaviour in Dounreay soils
- Effects of hydrogen and bromide on the corrosion of spent nuclear fuel and γ-irradiated UO2(s) in NaCl brine
- Sorption of selenium on Mg-Al and Mg-Al-Eu layered double hydroxides
- Studies of the ternary systems humic substances – kaolinite – Pu(III) and Pu(IV)
- Polarized EXAFS characterization of the sorption mechanism of yttrium on hectorite
- Measuring sorption coefficients and BET surface areas on intact drillcore and crushed granite samples
- Hydration and hydrolysys of Sm3+ and Eu3+ in a clay interlayer: a neutron diffraction study with isotopic substitution
- Sorption of neptunium onto goethite in the presence of humic acids with different hydroquinone group content
- The influence of carbonate complexation on lanthanide/actinide sorption on montmorillonite
- Sorption of radionuclides onto natural clay rocks
- The influence of natural organic matter on the speciation and solubility of Eu in Boom Clay porewater
- Sorption behavior of americium onto bentonite colloid
- Vertical distribution of 238Pu, 239(40)Pu, 241Am, 90Sr and 137Cs in Austrian soil profiles
- Pu(V) reduction and enhancement of particle-water partitioning by exopolymeric substances
- Laser ablation microprobe inductively coupled plasma mass spectrometry study on diffusion of uranium into cement materials
- Binding of Pu(IV) to galacturonic acid and extracellular polymeric substances (EPS) from Shewanella putrefaciens, Clostridium sp. and Pseudomonas fluorescens
