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Solubility of uranium(IV) hydrous oxide in high pH solution under reducing condition
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Kenso Fujiwara
Published/Copyright:
December 21, 2007
Summary
The solubility of uranium(IV) hydrous oxide was measured at 25 °C in NaClO4 solution containing Na2S2O4 as a reducing agent in the pH range from 12 to 14. The experiment was carried out from oversaturation at I = 0.5, 1.0 and 2.0 mol/dm3 (M). The solubility data were analyzed to obtain the hydrolysis constants (βm) of U(OH)m(4-m). By taking the specific ion interaction theory (SIT) for ionic strength corrections and by using the solubility product log Ksp° = −53.93 ± 0.20, the hydrolysis constants at I = 0, log β5°<48.10 and log β6° = 48.95 ± 1.01, were determined together with the ion interaction coefficients of U(OH)5− and U(OH)62−.
Received: 2004-5-11
Accepted: 2004-11-8
Published Online: 2007-12-21
Published in Print: 2005-6-1
© by Oldenbourg Wissenschaftsverlag, München
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- Recovery of minor actinides from HLLW using the DIAMEX process
- Towards a DIAMEX process using high active concentrate. Production of genuine solutions
- The mobility of anthropogenic 129I in a shallow sand aquifer at Sturgeon Falls, Ontario, Canada
