Acid strength dependent behaviour of Gd(III) ions in aqueous medium and its effect on Gd(III) separation from aqueous phase

Present paper deals with evaluation of thermodynamic parameters like apparent molal volume and compressibility, thermal expansion coefficient, hydration number, heat of dilution from density, sound velocity measurements and calorimetric studies of Gd(NO₃)₃ solutions in aqueous medium and in presence of nitric acid of different strength. Nature of complex formed by Gd ions in aqueous medium in presence of varying concentrations of nitric acid, as revealed by changes in the thermodynamic parameters and its extraction profile, is also highlighted. (author)