Solvent Extraction of Barium into Nitrobenzene by Using Hydrogen Dicarbollylcobaltate in the Presence of Slovafol 909

Extraction of microamounts of barium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B–) in the presence of Slovafol 909 (L) has been investigated. The equilibrium data have been explained assuming that the species HL+, HL+ 2, BaL2+ and BaL2+ 2 are extracted into the organic phase. The values of extraction and stability constants of the complex species in nitrobenzene saturated with water have been determined.