Extraction of microamounts of Eu and Am into nitrobenzene using a synergistic mixture of chlorinated hydrogen dicarbollylcobaltate and N,N′-diethyl-N,N′-diphenyl-2,6-dipicolinamide

Abstract

Extraction of microamounts of Eu and Am with a nitrobenzene solution of chlorinated hydrogen dicarbollylcobaltate (H+B−) in the presence of N,N′-diethyl-N,N′-diphenyl-2,6-dipicolinamide (EtPhDPA, L) was studied. The equilibrium data were interpreted assuming that the complexes HL+, HL2+, ML23+, ML33+, and ML4/3+ (M3+ = Eu3+, Am3+) are extracted into the organic phase. The extraction and stability constants of the species in water-saturated nitrobenzene were determined. The stability constants of the related complexes EuLn3+ and AmLn3+, where n = 2, 3, 4, in this medium are comparable.