The separation of trivalent actinides from lanthanides by dithiophosphinic acids from HNO3 acid medium

摘要

The extraction of Am(III) and Eu(III) has been investigated using mixtures of synthesized aromatic dithiophosphinic acids (R2PSSH) and tributylphosphate (TBP), trioctylphosphine oxide (TOPO) or tributylphosphine oxide (TBPO) in toluene from nitric acid (0.01-1.5 mol l-(1)). There was no detectable extraction when R(2)PSSHs were used alone as extractants for either Am(III) or Eu(III) (D-Am,D-Eu <10(-4)) under the experimental conditions used in this study, High separation factors (D-Am/D-Eu>20) with D-Am>1 were achieved in the nitric acid range 0.1-1 mol l(-1) by means of a synergistic mixture of bischlorodithiophosphinic acid with TBP, TOPO or TBPO. (C) 1998 Elsevier Science S.A. [References: 10]