TRIVALENT MINOR ACTINIDES LANTHANIDES SEPARATION, USING ORGANOPHOSPHINIC ACIDS/

The present paper compares the abilities of purified Cyanex 301, Cyane x 302 and Cyanex 272 acids to extract and separate Am-241 from Eu-152. Very high separation factors were observed when using Cyanex 301 acid after its purification through the precipitation of its ammonium salt in benzene. Some studies on synergistic mixtures, containing both pur ified Cyanex 301 acid and tri-n-butylphosphate (TBP), are also describ ed. The stoichiometry of the adducts extracted in the organic phase wa s estimated through slopes analyses: unexpectedly, different results w ere observed for 241Am(III) and for Eu-152(III). (C) 1998 Elsevier Sci ence S.A.