Separation studies of yttrium(III) and lanthanide(III) ions with 4-benzoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-thione and trioctylphosphine oxide using a robotic extraction system

Journal Article · Wed Jul 01 04:00:00 EDT 1992 · Solvent Extraction and Ion Exchange

DOI:https://doi.org/10.1080/07366299208918112· OSTI ID:171569

Nekimken, H L; Smith, B F; Jarvinen, G D; Bartholdi, C S ^[1]

---

1. Los Alamos National Lab., NM (United States)

We studied the extraction of trivalent Y, La, Pr, Nd, Sm, Eu, Gd, Dy, Er, and Lu from aqueous perchlorate solutions using a mixture of 4-benzoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-thione (HBMPPT) and trioctylphosphine oxide (TOPO). The metal ion distribution coefficients (D-values) as a function of increasing lanthanide atomic number increased initially, reached a maximum value at Nd, then decreased to a nearly constant value for Gd and the later lanthanides. The D-values vary slightly across the lanthanide series, the maximum difference being a factor of 14 between La and Nd. Analysis of slopes of plots of log D versus pH, log [HBMPPT], and log [TOPO] indicated that the stoichiometries of the extraction complexes varied across the lanthanide series showing a decrease in the number of HBMPPT (and/or BMPPT) units and an increase in the number of TOPO molecules involved in the major extraction species. This extraction system can provide a good way to separate the trivalent actinides from the trivalent lanthanides. 21 refs., 2 figs., 3 tabs.

• Sponsoring Organization: USDOE
• OSTI ID: 171569
• Journal Information: Solvent Extraction and Ion Exchange, Journal Name: Solvent Extraction and Ion Exchange Journal Issue: 3 Vol. 10; ISSN 0736-6299; ISSN SEIEDB
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ACTINIDES
EXPERIMENTAL DATA
LIGANDS
NITRIC ACID
PH VALUE
RARE EARTH COMPOUNDS
ROBOTS
SOLUTIONS
SOLVENT EXTRACTION
SPECTROPHOTOMETRY
SULFANILIC ACID
TOPO
YTTRIUM COMPOUNDS