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Mixed ligand chelate extraction of lanthanides I. 8-quinolinol systems

Journal Article · · Sep. Sci. Technol.; (United States)
; ;

A detailed study of the equilibrium extraction behavior of a series of representative tervalent lanthanide ions, La, Pr, Eu, Ho, and Yb, into chloroform solutions containing either 8-quinolinol (HQ) alone or mixed with 1,10-phenanthroline (phen), was carried out. The results demonstrated that, except for La which extracted as a simple chelate, LaQ/sub 3/, the lanthanides extract as self-adduct chelates, LnQ/sub 3/.2HQ, and at higher HQ concentrations, LnQ/sub 3/.3HQ. In the presence of phen, mixed ligand chelates of all the lanthanides but La of the formula LnQ/sub 3/.2HQ.phen are formed. The use of the experimental parameters, pH, concentration of both HQ and phen to optimize the separation of the lanthanides is discussed. It is concluded that chelate extraction systems in which adduct and mixed ligand complexes are formed enhance separation capability.

Research Organization:
Univ. of Arizona, Tucson
OSTI ID:
6812956
Journal Information:
Sep. Sci. Technol.; (United States), Journal Name: Sep. Sci. Technol.; (United States) Vol. 15:4; ISSN SSTED
Country of Publication:
United States
Language:
English

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ADDUCTS
AZINES
CHELATES
CHLORINATED ALIPHATIC HYDROCARBONS
CHLOROFORM
COMPARATIVE EVALUATIONS
COMPLEXES
ELEMENTS
EUROPIUM
EXTRACTION
HALOGENATED ALIPHATIC HYDROCARBONS
HETEROCYCLIC COMPOUNDS
HOLMIUM
LANTHANUM
LIGANDS
METALS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHENANTHROLINES
PRASEODYMIUM
PYRIDINES
QUINOLINES
RARE EARTHS
SEPARATION PROCESSES
SOLVENT EXTRACTION
YTTERBIUM