Uranium(IV) Complexes Formed in Extraction with Tributyl Phosphate from Nitric Acid Solutions |
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| Authors: | Fedorov Yu. S. Zilberman B. Ya. Kopyrin A. A. Arkhipov S. A. |
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| Affiliation: | (1) Khlopin Radium Institute, Research and Production Association, St. Petersburg, Russia;(2) St. Petersburg State Technological Institute, St. Petersburg, Russia |
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| Abstract: | ![]()
Speciation of U(IV) in tributyl phosphate (TBP) solutions prepared by extraction of U(IV) from 2 M HNO3 was studied. The electronic spectra showed that in the solutions containing from 3 to 60% TBP a mixture of disolvate U(NO3)4(TBP)2 and hydrates with hypothetical formula (TBP)m...[U(NO3)k· (H2O)n](4-k)+ (k = 3 or 4) is formed. Within the 70-100% concentration range, the hexanitrate complex (TBP)n...2H5O2(H2O)p+...[U(NO3)6]2- also appears. In undiluted TBP, as the concentration of uranyl nitrate increases, first the hexanitrate complex and then hydrated complexes of U(IV) gradually disappear. At uranium concentration more than 300 g l-1, only U(IV) tetranitrate disolvate exists in the organic phase. |
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