Abstract
Uranium dioxide and its solid solutions with neptunium, plutonium and americium dioxides can be efficiently and quantitatively dissolved using tri-n-butyl phosphate (TBP) saturated with nitric acid. Individual NpO2 and PuO2 do not dissolve under these conditions. On the treatment of a mechanical mixture of UO2 with PuO2 and NpO2 with TBP–HNO3, a complex of uramiun completely dissolved, whereas Np and Pu remained in the residue.
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