Solvent Extraction of Microamounts of Europium and Americium into Nitrobenzene by Using Hydrogen Dicarbollylcobaltate in the Presence of “classical” CMPO

Extraction of microamounts of europium and americium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B–) in the presence of octyl-phenyl – N,N – diisobutylcarbamoylmethyl phosphine oxide (“classical” CMPO, L) has been investigated. The equilibrium data have been explained assuming that the complexes HL+, HL+ 2, ML3+ 2, ML3+ 3 and ML3+ 4, (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.