Am(III) and Eu(III) extraction by substituted quaternary ammonium salts
- Argonne National Lab., IL (United States)
The extraction of Am(III) and Eu(III) from HNO{sub 3}-LiNO{sub 3} or from HCOOH-NH{sub 4}SCN solutions by different quaternary ammonium salts dissolved in o-xylene was investigated as function of the aqueous phase composition. As extractants, the nitrate or thiocyanate salts of Aliquat{sm_bullet}336, tridodecylmethylammonium, benzyldimethyldodecylammonium, p-methoxybenzyldimethyidodecylammonium and p-trifluoromethylbenzyldimethyldodecylammonium were used. The extraction data were interpreted by a reaction scheme that takes into account the aqueous metal complexation and the competition between aqueous acid and metal species for the extractant reaction center. The effect of the benzyl group (whether substituted or not) on the metal and acid extraction by the different quaternary ammonium salts was interpreted on the basis of the inductive effect of the substituents. In the thiocyanate system, Aliquat{sm_bullet}336 provided the highest Am/Eu separation factors. In the nitrate system, the highest Am/Eu separation factors were exhibited by the benzyl substituted quaternary ammonium salts.
- OSTI ID:
- 126606
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
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