title: Affinity capillary electrophoresis in studying the complex formation equilibria of radionuclides in aqueous solutions.
abstract: Interaction of radionuclides with inorganic and organic species present in natural environment plays an important role in their eventual dispersion. The complex equilibria established in the aqueous phase cause significant changes in the migration properties of radionuclides. Affinity capillary electrophoresis (ACE) can be fruitful in studying these equilibria. This paper reviews the recent methodological advances of the use of ACE in studying the complex equilibria of radionuclides in aqueous solutions. Special attention is paid to the determination of a number of species involved in equilibrium, species constituents (number of ligands, protonated, deprotonated), the influence of ionic strength and temperature on stability constants of complex species formed. Use of ACE for the determination of the main thermodynamic parameters (the molar Gibbs energy (ΔrGm), the molar enthalpy (ΔrHm) and the molar entropy (ΔrSm)) of complex formation reactions is also discussed. These data are essential to predict dispersion of radionuclides in the natural environment.
authors.affiliation: CNRS, Institut de Physique Nucléaire (IPN), UMR 8608, Orsay, France. sladkov@ipno.in2p3.fr.|Univ Paris-Sud, Orsay, France. sladkov@ipno.in2p3.fr.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Sladkov
mesh_terms: D019075:Electrophoresis, Capillary / Q000379:methods*; D004784:Environmental Monitoring; D008956:Models, Chemical; D011868:Radioisotopes / Q000032:analysis* / Q000737:chemistry*; D013816:Thermodynamics; D014501:Uranium / Q000032:analysis* / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D011868:Radioisotopes; D014867:Water; D014501:Uranium
keywords: Affinity capillary electrophoresis; Radionuclides; Stability constant; Thermodynamic parameters; Uranium