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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 Department of Analytical Chemistry, Faculty of Chemical Engineering Prague Czech Republic
  • | 3 Nuclear Research Institute 250 68 Řež Czech Republic
  • | 4 Khlopin Radium Institute, Research and Production Association St. Petersburg Russia
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Extraction of microamounts of europium and americium by a phenyltrifluoromethyl sulfone (FS 13) solution of hydrogen dicarbollylcobaltate (H+B) in the presence of N,N′-diethyl-N,N′-diphenyl-2,6-dipicolinamide (EtPhDPA, L) has been investigated. The equilibrium data have been explained assuming that the species HL+, HL2+, ML23+, ML33+ and ML43+ (M3+ = Eu3+, Am3+) are extracted into the organic phase. The values of extraction and stability constants of the cationic complexes in FS 13 saturated with water have been determined. It was found that the stability constants of the corresponding complexes EuLn3+ and AmLn3+, where n = 2, 3, 4 and L is EtPhDPA, in water-saturated FS 13 are comparable.