The formation of the hydrolytic complexes of U(IV) has been investigated by measuring the potential of inert sponges and of a glass electrode, at 25.00 °C, in 3 M NaClO4, in solutions containing both U(VI) and U(IV) at acidities between 10-0.5 and 10-1.8 M.The experimental data can be explained by assuming the formation of two mononuclear complexes, UOH3+ and U(OH)4. Their formation constants in the ionic medium 3 M NaClO4 are: log*β1=-1.62±0.01 and log*β4=-7.70±0.03. The formal standard potential E°6,4 for the couple UO22+/U4+ in the same conditions, is (335.7±0.5) mV.
On the Hydrolysis of the Tetravalent Uranium Ion U4+ / Manfredi, Carla; V., Caruso; E., Vasca; S., Vero; E., Ventimiglia; G., Palladino; Ferri, Diego. - In: JOURNAL OF SOLUTION CHEMISTRY. - ISSN 0095-9782. - ELETTRONICO. - 35:7(2006), pp. 927-937. [10.1007/s10953-006-9037-x]
On the Hydrolysis of the Tetravalent Uranium Ion U4+
MANFREDI, CARLA;FERRI, DIEGO
2006
Abstract
The formation of the hydrolytic complexes of U(IV) has been investigated by measuring the potential of inert sponges and of a glass electrode, at 25.00 °C, in 3 M NaClO4, in solutions containing both U(VI) and U(IV) at acidities between 10-0.5 and 10-1.8 M.The experimental data can be explained by assuming the formation of two mononuclear complexes, UOH3+ and U(OH)4. Their formation constants in the ionic medium 3 M NaClO4 are: log*β1=-1.62±0.01 and log*β4=-7.70±0.03. The formal standard potential E°6,4 for the couple UO22+/U4+ in the same conditions, is (335.7±0.5) mV.| File | Dimensione | Formato | |
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