Abstract
The Th solubilities of the sample solutions that initially contained Th(OH)4(am) prepared by undersaturation and oversaturation methods in the pHc range of 2.0–8.0 in a 0.5 M ionic strength solution of NaClO4 and HClO4 and stored at aging temperatures (Ta) of 298, 313 and 333 K were investigated in this study. After a certain period of time up to 40 weeks depending on Ta, supernatants of the sample solutions were ultrafiltrated through 3 kDa membranes under the measurement temperature (Tm) of 298, 313 and 333 K. Size distributions of the colloidal species were investigated by ultrafiltration using membranes with different pore sizes ranging from 3 to 100 kDa, and the solid phases were examined by X-ray diffraction (XRD). The solubility of the sample solutions obtained after aging at Ta=298 K using undersaturation method with continuous shaking was similar to those of dried precipitate of Th hydroxide. The solubilities obtained after aging at Ta=313 and 333 K were lower than those at Ta=298 K. The XRD spectra suggested that the crystallization of the solid phase proceeded under these elevated temperatures. The solubility of the sample solutions obtained after aging at Ta=333 K using the oversaturation technique were similar to those prepared by undersaturation method and aged at the same Ta. A slight temperature dependence of the apparent solubilities on the Tm was observed in the sample solutions prepared by both methods. The solubility products
Acknowledgments
This study was partially conducted under the Visiting Researchers Program of the Kyoto University Research Reactor Institute (KURRI). This work was supported by the JSPS Grant-in-Aid for Young Scientists (B) Grant Number 16K18348.
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©2018 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Development of a “fission-proxy” method for the measurement of 14-MeV neutron fission yields
- Investigations on the complete removal of iron(III) interference on the uranium(VI) extraction from sulfate leach liquor using Alamine 336 in kerosene
- Homogeneous hydrolysis of thorium by thermal decomposition of urea
- Solubilities and solubility products of thorium hydroxide under moderate temperature conditions
- Determination of uranium and thorium concentrations in thorium ore sample using artificial neural network and comparison with net area peak method
- Solvent extraction separation of zirconium and hafnium from nitric acid solutions using mixture of Cyanex-272 and TBP
- Development of granular radioactive reference source from 152,154Eu adsorbed on tin tungstate matrix
- Dosimetric characterization of novel polycarbonate/porphyrin film dosimeters for high dose dosimetry: study on complexation effect
- EPR measurement of environmental radiation using human fingernails
Artikel in diesem Heft
- Frontmatter
- Development of a “fission-proxy” method for the measurement of 14-MeV neutron fission yields
- Investigations on the complete removal of iron(III) interference on the uranium(VI) extraction from sulfate leach liquor using Alamine 336 in kerosene
- Homogeneous hydrolysis of thorium by thermal decomposition of urea
- Solubilities and solubility products of thorium hydroxide under moderate temperature conditions
- Determination of uranium and thorium concentrations in thorium ore sample using artificial neural network and comparison with net area peak method
- Solvent extraction separation of zirconium and hafnium from nitric acid solutions using mixture of Cyanex-272 and TBP
- Development of granular radioactive reference source from 152,154Eu adsorbed on tin tungstate matrix
- Dosimetric characterization of novel polycarbonate/porphyrin film dosimeters for high dose dosimetry: study on complexation effect
- EPR measurement of environmental radiation using human fingernails