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  • 1 University of West Bohemia Faculty of Applied Sciences Husova 11 306 14 Pilsen Czech Republic
  • | 2 Institute of Chemical Technology, Prague Technická 5 166 28 Prague Czech Republic
  • | 3 Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic Heyrovský sq. 2 162 06 Prague Czech Republic
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Solvent extraction of microamounts of europium and cerium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B) in the presence of polyethylene glycol PEG 600 (L) has been investigated. The equilibrium data have been explained assuming that the complexes HL+, H2L2+ and ML3+ (M3+ = Eu3+, Ce3+; L = PEG 600) are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene saturated with water have been determined. It was found that the stability constants of the EuL3+ and CeL3+ cationic complex species (L = PEG 600) in water-saturated nitrobenzene are the same.