Synergistic extraction of europium into nitrobenzene by using hydrogen dicarbollylcobaltate and 2, 6 - (diphenylphosphino)pyridine dioxide.
Solvent extraction of microamounts of europium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B-) in the presence of 2, 6 - (diphenylphosphino)pyridine dioxide (DPPPDO, L) has been investigated. The equilibrium data have been explained assuming that the species HL+, HL+2, EuL3+3 and EuL3+4 are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene saturated with water have been determined.
Emanuel
E
Makrlík
Petr
P
Vaňura
Pavel
P
Selucký
Zdeněk
Z
Spíchal