The solubility of Th(IV) and U(IV) hydrous oxides in concentrated NaHCO{sub 3} and Na{sub 2}CO{sub 3} solutions
- Pacific Northwest Lab., Richland, WA (United States)
The solubility of Th(IV) and U(IV) hydrous oxide was studied in the aqueous HCO{sub 3}{sup {minus}}-CO{sub 3}{sup 2{minus}}-OH{sup {minus}}-H{sub 2}O system extending to high concentration. The solubility of the Th(IV) and U(IV) hydrous oxides increases dramatically in both high bicarbonate and carbonate solutions and decreases with the increase in hydroxide at a fixed carbonate concentration. In general, the observed solubility of Th(IV) hydrous oxide at a given total carbonate concentration was three to four of magnitude higher than the solubility of U(IV) hydrous oxide. In the studies of the U(IV) system, extreme caution was used to ensure that the dissolved U was present as U(IV). Oxidation state analyses and systematic trends in the U(IV) solubility data similar to those for Th(IV), which is not redox sensitive, indicated that the dissolved U was present as U(IV).
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 382894
- Report Number(s):
- CONF-941075--; ISBN 1-55899-253-7
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
ACID CARBONATES
AQUEOUS SOLUTIONS
EXPERIMENTAL DATA
GROUND WATER
HYDRATES
POTASSIUM CARBONATES
RADIOACTIVE WASTE DISPOSAL
RADIOACTIVE WASTE FACILITIES
SODIUM CARBONATES
SODIUM COMPOUNDS
SODIUM HYDROXIDES
SOLUBILITY
SOLVENT PROPERTIES
THORIUM OXIDES
URANIUM OXIDES
VALENCE