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In this paper we report an investigation on the interactions between dioxouranium(VI) and citrate using potentiometry (H + -glass electrode) and UV-spectrophotometry. Potentiometric measurements were carried out in NaCl and KNO 3  aqueous solutions at  t  = 25 ºC in a wide range of experimental conditions (concentrations, ligand/metal molar ratio, pH, titrants). Measurements in NaCl were carried out at different ionic strength values (0.1 ≤  I /mol L −1  ≤ 1.0); different procedures were employed for the acquisition of experimental data and careful analysis of these data performed. In all cases the speciation model that best fits experimental data takes into account the formation of the following species: UO 2 (Cit) − , (UO 2 ) 2 (Cit) 2  2− , (UO 2 ) 2 (Cit) 2 (OH)   2  4−    , (UO 2 ) 2 (Cit) 2 (OH) 3− , (UO 2 ) 2 (Cit)(OH) 2  − , (UO 2 ) 2 (Cit)(OH) 0 , (UO 2 ) 3 (Cit) 2 (OH)   5  5− .

radiochimica acta

Potentiometric and spectrophotometric characterization of the UO 2  2+ -citrate complexes in aqueous solution, at different concentrations, ionic strengths and supporting electrolytes