Mixed ligand chelate extraction of lanthanides with 1-phenyl-3-methyl-4-octanoyl-5-pyrazolone systems

Abstract

The equilibrium extraction behavior for a series of representative trivalent lanthanide ions, Pr, Eu, and Yb, using chloroform solutions containing 1-phenyl-3-methyl-4-octanoyl-5-pyrazolone (HPMOP), either alone or combined with 1,10-phenanthroline (phen), trioctylphosphine oxide (TOPO) or methyltrioctylaromonium chloride (R 3R'NCl), is studied. The results demonstrate that these lanthanides are extracted as LnP 3, or in the presence of phen or TOPO. as LnP 3 · phen or LnP 3 · TOPO, or in the presence of R 3R'NCl, as R 3R'NLnP 4. The effects of phen, TOPO, and R 3R—NCl on the extraction of lanthanide ions with HPMOP are more pronounced than their effects with 8-quinolinol or 5,7-dibromo-8-quinolinol.