Extraction of tetravalent neptunium isoxazolonates as their TOPO adducts
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S. Banerjee
Summary
The extraction behaviour of Np(IV) by 3-phenyl-4-benzoyl-5-isoxazolone (HPBI) in the presence of tri-n-octyl phosphine oxide (TOPO) was investigated from nitric acid medium. The speciation studies, carried out by the slope analysis method, yielded binary species of the type Np(PBI)4 when only HPBI was used as the extractant and ternary species of the type Np(PBI)4·TOPO when both HPBI and TOPO were used as the extractants. The two-phase extraction constant for the binary species (log kex) was calculated to be 10.11±0.03, while that for the ternary species was found to be 17.24±0.05. Thermodynamic parameters for the binary and ternary extraction systems were also determined. Both the binary and ternary extraction systems were found to be highly spontaneous processes with predominant enthalpy stabilization. The very high negative entropy factor suggested contribution of unfavourable steric factors.
© 2004 Oldenbourg Wissenschaftsverlag GmbH
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Articles in the same Issue
- Measurement of cross sections of threshold detectors with spectrum average technique
- Ionic radii of heavy actinide(III) cations
- Effect of the chemical state of uranium atom on the energy of spin-orbital splitting of its inner orbitals
- Heterogeneous catalytic redox reactions of neptunium ions in the aqueous system HNO3-HCOOH
- Field study of the migration of 90Sr, 237Np, 238Pu and 241Am in unsaturated Chinese loess under artificial rainfall condition
- Extraction of tetravalent neptunium isoxazolonates as their TOPO adducts
- Extraction of Eu(III) and Tm(III) with picrolonic acid in methylisobutylketone
- Adsorption of 60Co2+ on hydrous manganese oxide powder from aqueous solution
- Simultaneous multi-element determination in some cosmetic samples of different origins using neutron activation analysis
- Radiolysis of an aqueous [11C]iomazenil solution
