SYNERGISTIC SELECTIVE EXTRACTION OF ACTINIDES(III) OVER LANTHANIDES FROM NITRIC ACID USING NEW AROMATIC DIORGANYLDITHIOPHOSPHINIC ACIDS AND NEUTRAL ORGANOPHOSPHORUS COMPOUNDS
- 1 January 1999
- journal article
- research article
- Published by Taylor & Francis in Solvent Extraction and Ion Exchange
- Vol. 17 (1) , 33-53
- https://doi.org/10.1080/07360299908934599
Abstract
New aromatic dithiophosphinic acids (R2PSSH) with R = C6H5−, ClC6H4−, FC6H4− and CH3C6H4− were synthesized, characterized and tested as potential separating agents for trivalent actinides over lanthanides. The extraction of Am(III), Eu(III) and other lanthanides was carried out from nitric acid medium with mixtures of R2PSSHS and neutral organophosphorus compounds. There was no detectable extraction when R2PSSHS were used alone as extractants for either Am(III) or Eu(III) (DAM,EU.< 10−3) under the experimental conditions used in this study. High separation factors (DAM/DEU > 20) with DAM > 1 were achieved in the nitric acid range 0.1-1 mol/L by means of a synergistic mixture of bis(chloro-phenyl)dithiophosphinic acid + tributylphosphate (TBP), irioctylphosphine oxide (TOPO) or tributylphosphine oxide (TBPO). The high radiation resistance (up to 106 Gy absorbed γ-doses) of the extractants was also demonstrated.Keywords
This publication has 1 reference indexed in Scilit:
- Influence of the purity and irradiation stability of Cyanex 301 on the separation of trivalent actinides from lanthanides by solvent extractionJournal of Radioanalytical and Nuclear Chemistry, 1998