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Kenso Fujiwara, Hajimu Yamana, Toshiyuki Fujii, Kozo Kawamoto, Takayuki Sasaki, Hirotake Moriyama

Solubility of uranium(IV) hydrous oxide in high pH solution under reducing condition

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 (β_m) 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 K_sp°=-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)₆^2-.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 93, 06/2005
Pages: 347 - 350

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