Mixed ligand chelate extraction of lanthanides with 5,7-dibromo-8-quinolinol systems

Journal Article · Fri May 01 00:00:00 EDT 1981 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00229a031· OSTI ID:6364904

Tochiyama, O; Freiser, H

The equilibrium extraction behavior is studied for a series of representative tervalent lanthanide ions, Pr, Eu, and Yb, using chloroform solutions containing either 5,7-dibromo-8-quinolinol (HQ) alone or combined with 1,10-phenanthroline (phen) or tetra-n-heptylammonium chloride (R/sub 4/NCl). The results demonstrate that these lanthanides are extracted as LnQ/sub 3/.HQ or in the presence of phen as LnQ/sub 3/.phen or in the presence of R/sub 4/NCl as R/sub 4/NLnQ/sub 4/. Although 8-quinolinol forms more stable chelates with these metals, the higher acid dissociation constant of the dibromo compound results in increased extraction constants, making extraction possible in lower pH ranges. Furthermore, the effect of phen or R/sub 4/NCl on the extraction and separation of lanthanides by 5,7-dibromo-8-quinolinol is more pronounced than their effect in the 8-quinolinol system.

• Research Organization: Univ. of Arizona, Tucson
• OSTI ID: 6364904
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 53:6; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
AZINES
CHELATES
CHLORINATED ALIPHATIC HYDROCARBONS
CHLOROFORM
COMPLEXES
ELEMENTS
EUROPIUM
EUROPIUM COMPLEXES
EXTRACTION
HALOGENATED ALIPHATIC HYDROCARBONS
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
LIGANDS
METALS
ORGANIC BROMINE COMPOUNDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXINE
PHENANTHROLINES
PRASEODYMIUM
PRASEODYMIUM COMPLEXES
PYRIDINES
QUINOLINES
RARE EARTH COMPLEXES
RARE EARTHS
SEPARATION PROCESSES
SOLVENT EXTRACTION
YTTERBIUM
YTTERBIUM COMPLEXES