Extraction studies of selected actinide ions from aqueous solutions with 4-benzoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-thione and tri-n-octylphosphine oxide

Conference · Fri Nov 01 04:00:00 EST 1991

OSTI ID:5498869

Hannink, N J; Hoffman, D C ^[1]; Smith, B F ^[2]

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1. Lawrence Berkeley Lab., CA (United States) California Univ., Berkeley, CA (United States). Dept. of Chemistry
2. Los Alamos National Lab., NM (United States)

The first measurements of distribution coefficients (K{sub d}) for Cm(III), Bk(III), Cf(III), Es(III), and Fm(III) between aqueous perchlorate solutions and solutions of 4-benzoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-thione (BMPPT) and the synergist tri-n-octylphosphine oxide (TOPO) in toluene are reported. Curium-243, berkelium-250, californium-249, einsteinium-254, and fermium-253 were used in these studies. The K{sub d} for {sup 241}Am was also measured and is in agreement with previously published results. Our new results show that the K{sub d}'s decrease gradually with increasing atomic number for the actinides with a dip at Cf. In general, the K{sub d}'s for these actinides are about a factor of 5 to 10 greater than the K{sub d}'s for the homologous lanthanides at a pH of 2.9, a BMPPT concentration of 0.2 M, and a TOPO concentration of 0.04 M. The larger K{sub d}'s for the actinides are consistent with greater covalent bonding between the actinide metal ion and the sulfur bonding site in the ligand.

• Research Organization: Lawrence Berkeley Lab., CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5498869
• Report Number(s): LBL-31566; CONF-910812--15; ON: DE92010267
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400105* -- Separation Procedures
400702 -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ACTINIDES
ALPHA DECAY RADIOISOTOPES
AQUEOUS SOLUTIONS
BERKELIUM
BERKELIUM 250
BERKELIUM ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CALIFORNIUM
CALIFORNIUM 249
CALIFORNIUM ISOTOPES
CHEMICAL BONDS
CHEMICAL PROPERTIES
CHLORINE COMPOUNDS
CURIUM
CURIUM 243
CURIUM ISOTOPES
DAYS LIVING RADIOISOTOPES
DISPERSIONS
DISTRIBUTION
EINSTEINIUM
EINSTEINIUM 254
EINSTEINIUM ISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
EVEN-ODD NUCLEI
EXTRACTION
FERMIUM
FERMIUM 253
FERMIUM ISOTOPES
HALOGEN COMPOUNDS
HEAVY NUCLEI
HOURS LIVING RADIOI
HOURS LIVING RADIOISOTOPES
ISOTOPES
METALS
MIXTURES
NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
PERCHLORATES
PH VALUE
PHASE STUDIES
PHOSPHINE OXIDES
PHOSPHINES
PHOSPHORUS COMPOUNDS
RADIOISOTOPES
SEPARATION PROCESSES
SOLUTIONS
SPONTANEOUS FISSION RADIOISOTOPES
SULFUR COMPOUNDS
TRANSPLUTONIUM ELEMENTS
TRANSURANIUM ELEMENTS
YEARS LIVING RADIOISOTOPES