Solvent Extraction of Microamounts of Calcium into Nitrobenzene Using Hydrogen Dicarbollylcobaltate and 2,3-Naphtho-15-crown-5

Extraction of microamounts of calcium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B–) in the presence of 2,3-naphtho-15-crown-5 (N15C5, L) has been investigated. The equilibrium data have been explained assuming that the complexes HL+, HL+ 2, CaL2+ and CaL2+ 2 are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene saturated with water have been determined.