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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 Nuclear Research Institute 250 68 Řež Czech Republic
  • 4 Research and Production Association Khlopin Radium Institute St. Petersburg Russia
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Extraction of microamounts of europium and americium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B) in the presence of N,N,N′,N′-tetraethyl-2,6-dipicolinamide (TEtDPA, L) has been investigated. The equilibrium data have been explained assuming that the cations HL+, HL23+, ML23+ and ML33+ (M3+ = Eu3+, Am3+) 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 has been found that the stability constants of the corresponding complexes EuLn,org3+ and AmLn,org3+, where n = 2, 3 and L is TEtDPA, in the mentioned medium are comparable.