Extraction of tervalent lanthanides as hydroxide complexes with tri-n-octylphosphine oxide

Journal Article · Thu Mar 15 04:00:00 EST 1990 · Analytical Chemistry (Washington); (USA)

DOI:https://doi.org/10.1021/ac00205a016· OSTI ID:6410237

Cecconie, T; Freiser, H ^[1]

---

1. Univ. of Arizona, Tucson (USA)

The extraction behavior of lanthanum(III), praseodymium(III), europium(III), terbium(III), holmium(III), and ytterbium(III) from dilute chloride solutions into chloroform solutions containing tri-n-octylphosphine oxide (TOPO) was examined. The lanthanides were found to extract as hydroxide complexes of the form Ln(OH){sub 3}{center dot}nTOPO. The extraction selectivity for this system increases with increasing TOPO concentration, rivaling those for common acidic organophosphorus extractants in the TOPO concentration range 0.025-0.100 M and surpassing them at higher concentrations. When TOPO concentrations of 0.25 M or greater are employed, the extraction system is, overall, the most selective for lanthanide separations to date. This is the first report of the lanthanides extracting as hydroxide complexes.

• OSTI ID: 6410237
• Journal Information: Analytical Chemistry (Washington); (USA), Journal Name: Analytical Chemistry (Washington); (USA) Vol. 62:6; ISSN 0003-2700; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
CHLORIDES
CHLORINATED ALIPHATIC HYDROCARBONS
CHLORINE COMPOUNDS
CHLOROFORM
ELEMENTS
EUROPIUM
EXTRACTION
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
HOLMIUM
INFRARED SPECTRA
LANTHANUM
METALS
NMR SPECTRA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PRASEODYMIUM
RARE EARTHS
SEPARATION PROCESSES
SPECTRA
TERBIUM
YTTERBIUM