SummaryThe reactions between Am or Eu present in 0.1 M nitric acid solutions, alone or both together, with 0.25 M K

The enhanced dissolution of uranium oxides by the application of ultrasound in supercritical uid carbon dioxide containing dissolved 4,4-tri¯uoro-1-(2-thienyl)-1,3-butanedione and tributyl phosphate is demonstrated. Under conditions of 60°C and 150 atm the steady state dissolution of UO 3 with soni®cation is increased by approximately 100%. Furthermore, the effect of adding hydrogen peroxide to the supercritical system above enables the lower oxides of uranium, UO 2 and U 3 O 8 , to be extracted.

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