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The solubility behaviour of a synthetic uranium(VI) oxide was studied under inert conditions in aqueous NaClO 4  solution at 25 ± 2 °C. The dissolution kinetics were investigated in respect of pH in solution and O 2  partial pressure in the atmosphere. The actual uranium concentration was determined by ICP-MS measurements. Under acidic conditions we observed a moderate solubility which increases by lowering of the pH of solution yielding to a solubility constant of log 10  K  sp  = −24.38 ± 0.07. The influence of the ionic strength,  I , on the dissolution kinetics could be observed which was evaluated using a theoretical model considering the electrical double layer at the surface of the oxide as well as all possible reaction pathways. As a result we could determine the acid-base equilibrium constants of the surface groups and the overall reaction rate,  k  + , of dissolution process as a function of pH and  I . On this basis we are able to determine the pzc of the uranium oxide, to be 7.28. It is in good accordance with a minimum in the tendency of the solid to dissolve which was observed in the pH range 6 to 8.

radiochimica acta

Solubility kinetics of a synthetic uranium(VI) oxide at different pH and controlled O 2  partial pressure and evaluation of substantial interface properties