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  • 1 Faculté des sciences Laboratoire d’Electrochimie des solutions 5000 Monastir Tunisia
  • | 2 IN2P3-CNRS Institut de Physique Nucléaire Orsay Cedex F-91406 France
  • | 3 Univ. Paris-Sud Orsay Cedex F-91405 France
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The capillary electrophoresis method has been applied to the speciation study of uranium(VI) at room temperature, in 0.02M citrate buffer solutions, at pH values between 2.5 and 5.5 and at citrate/U ratios between 20 and 40. No negatively charged species have been pointed out at pH values lower than 3. For a pH value higher than 5, the electropherograms are ill-defined and the signals cannot be analyzed simply (owing to a high and rough baseline). In the pH range 3–5, up to 4 peaks can be attributed to U(VI) species. Two of them are likely due to the expected monomer [(UO2)(Cit)]and dimer [(UO2)2(Cit)2]2− complex species and these species are shown to be in quasi-equilibrium with two other species possessing slightly lower migration velocities, [(UO2)H(Cit)(OH)] and [(UO2)2H2(Cit)2(OH)2]2−, respectively. Speciation diagrams calculated by an exact analytical approach are proposed in order to explain the experimental results. A complete agreement between theoretical and experimental results needs to take into account kinetic and hydrolysis effects.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
per Year
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Founder Akadémiai Kiadó
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)