Synergistic extraction of copper(II) and zinc(II) with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone and tri-<i>n</i>-butyl phosphate by two-phase <i>p</i>H titration

108-110The extraction of Cu(II) and Zn(II) with 1-phenyl-3- methyl-4-benzoyl-5-pyrazolone (PMBP) and tri-n-butyl phosphate(TPB) in benzene has been studied by two-phase pH titration. The formation constants of the extracted complexes have been computed with computer program SCTPT. The effects of pH and nature of extractants on the extraction have been investigated