title: Use of electrospray ionization mass spectrometry for the study of Ln(III) complexation and extraction speciation with calixarene-CMPO in the fuel partitioning concept.
abstract: The calixarene-bearing CMPO groups belong to a family of extracting agents recently developed for nuclear reprocessing. These molecules exhibit specific properties to separate actinides(III) from lanthanides(III) in nitric acid solution. Speciation of two distinct calixarene-CMPO (carbamoyl phosphine oxide), substituted either in the wide rim or in the narrow rim with lanthanides (La, Eu, Yb), was undertaken. The complexation behaviour in single phase or in liquid-liquid extraction was examined with two different electrospray spectrometer source geometries. The stoichiometries of the different complexes were reported and the selectivity of these calixarenes towards lanthanides was determined. The results obtained were concordant for the two spectrometers and confirm that electrospray mass spectrometry is a useful tool to study non-covalently bonded complexes.
authors.affiliation: CEA Saclay DEN/DPC/SECR/Laboratoire de Spéciation des Radionucléides et des Molécules, Bât 391, 91191 Gif sur Yvette, France. christine.lamouroux@cea.fr
authors.forename: C
authors.initials: C
authors.lastname: Lamouroux
authors.forename: S
authors.initials: S
authors.lastname: Rateau
authors.forename: C
authors.initials: C
authors.lastname: Moulin