Multiparametric study of thorium oxide dissolution in aqueous media
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Marie Simonnet
Abstract
Thorium oxide is poorly soluble: unlike uranium oxide, concentrated nitric acid medium is not sufficient to get quantitative dissolution. Addition of small amounts of fluoride is required to achieve thorium oxide total dissolution. The effect of several parameters on thorium oxide dissolution in order to optimize the dissolution conditions is reported in this paper. Thus the influence of solid characteristics, dissolution method, temperature and composition of dissolution medium on ThO2 dissolution rate has been studied. No complexing agents tested other than fluoride allows total dissolution. Beyond a given HF concentration a decrease of the dissolution rate is observed due to the formation of a precipitate at the solid/solution interface. It was demonstrated by XPS measurements that this precipitate is constituted of thorium fluoride (ThF4) formed during the ThO2 dissolution. The low concentration of HF required to achieve a total dissolution and the activation energy value measured tends to show a catalytic effect of HF on the dissolution process.
Acknowledgments
The authors would like to thank AREVA and the CNRS for financial support.
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©2016 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Solvent extraction of Th(IV) from aqueous solution with methylimidazole in ionic liquid
- Multiparametric study of thorium oxide dissolution in aqueous media
- Evaluation of consequence due to higher hydrazine content in partitioning stream of PUREX process
- Optimization of the electrochemical pre-concentration of trivalent lanthanum from aqueous media
- Synthesis, characterization, and in vitro evaluation of a radio-metal organic framework composed of in vivo generator 166Dy/166Ho and DOTMP as a novel agent for bone marrow ablation
- Development and biological evaluation of 90Y-BPAMD as a novel bone seeking therapeutic Agent
- Determination of distribution coefficients (Kd) of various radionuclides on UTEVA resin
- IonLab – a remote-controlled experiment for academic and vocational education and training on extraction chromatography and ion exchange
Artikel in diesem Heft
- Frontmatter
- Solvent extraction of Th(IV) from aqueous solution with methylimidazole in ionic liquid
- Multiparametric study of thorium oxide dissolution in aqueous media
- Evaluation of consequence due to higher hydrazine content in partitioning stream of PUREX process
- Optimization of the electrochemical pre-concentration of trivalent lanthanum from aqueous media
- Synthesis, characterization, and in vitro evaluation of a radio-metal organic framework composed of in vivo generator 166Dy/166Ho and DOTMP as a novel agent for bone marrow ablation
- Development and biological evaluation of 90Y-BPAMD as a novel bone seeking therapeutic Agent
- Determination of distribution coefficients (Kd) of various radionuclides on UTEVA resin
- IonLab – a remote-controlled experiment for academic and vocational education and training on extraction chromatography and ion exchange
