Synergistic Extraction of Strontium into Nitrobenzene by Using Hydrogen Dicarbollylcobaltate and N,N,N´,N´-Tetracyclohexyl-oxybis(o-phenyleneoxy) diacetamide.

Extraction of microamounts of strontium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B-) in the presence of N,N,N´,N´-tetracyclohexyl-oxybis(o-phenyleneoxy)diacetamide (abbrev. barium ionophore I, L) has been investigated. The equilibrium date have been explained assuming that the species HL+, SrL2+ and SrL2+2 are extracted into the organic phase. The values of extraction and stability constants of the cationic complexes in nitrobenzene saturated with water have been determined.