Abstract
Extraction of trivalent actinides Am and Cm and trivalent lanthanides Pm and Eu has been studied with mixtures of N-benzoyl-N-phenyl hydroxylamine (HBPHA) and TBP, TOPO or dipy in chloroform. The order of synergistic extraction was found to be TBP>TOPO>dipy, which is just the reverse to the order of basicity of these neutral donors. The interaction of HBPHA with TBP has been studied in chloroform. The synergistic species extracted was found to be M(BPHA)3·n TBP (n=1 or 2). Log D vs pH plots (at fixed HBPHA and TBP concentrations) gave straight lines with slopes 1.4 (Am, Cm, Pm) and 1.7 (Eu) instead of the expected value of 3.0. Reasons for these abnormalities are discussed.
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