Abstract
The stability constant of the EuCl2 + complex was determined in perchloric acid media at 0.2, 0.5, and 1.0 M ionic strength by means of a solvent extraction method with dinonyl naphthalene sulfonic acid at 30°C. The values for β1,Cl were: 2.1 ± 0.1, 1.45 ± 0.01, and 0.84 ± 0.07, respectively, for each of the media. The Bronsted–Guggenheim–Scatchard specific ion interaction theory (SIT) was applied to these data and to some literature data to calculate a β1,Cl of 23.9 at infinite dilution. The calculated specific ion interaction coefficient e for the pair EuCl2 +, ClO4− was 0.52. Species-distribution diagrams have been analyzed.
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