Mixed-ligand chelate extraction of thorium(IV) and uranium(VI) with thenoyltrifluroacetone and various imidazoles
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M.L.P. Reddy
The synergistic extraction of thorium(IV) and uranium(VI) has been studied using mixtures of thenoyltrifluoroacetone (Htta) and various imidazoles such as imidazole (Imz), 2-methylimidazole (2-Meimz), benzimidazole (Bimz) or 2-pyridylbenzimidazole (2-Pybimz). The extraction data have been analysed by both graphical and theoretical methods by taking into account chemical mass action principles. The results demonstrate that these metal ions are extracted into chloroform as Th(tta)4 and UO2(tta)2 with Htta alone and as Th(tta)4 · nS and UO2(tta)2 · nS in the presence of imidazoles (where n = 1 and 2 for thorium(IV) and n = 1 for uranium(VI); S represents imidazole). The equilibrium constants of the above extracted complexes have been deduced by non-linear regression analysis. The addition of an imidazole to the metal chelate system enhances the extraction efficiency of these metal ions. The complexation strength of these metal ions with various imidazoles follows the order: Imz > 2-Meimz > Bimz > 2-Pybimz.
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Articles in the same Issue
- Recoil properties of radionuclides formed in photospallation reactions on complex nuclei at intermediate energies
- Understanding the peak asymmetry in alpha liquid scintillation with β/γ discrimination
- A device for on-line electromigration measurements of radioelements in free electrolytes
- Mixed-ligand chelate extraction of thorium(IV) and uranium(VI) with thenoyltrifluroacetone and various imidazoles
- The hydrolysis of dioxouranium(VI) investigated using EXAFS and 17O-NMR
- Interaction of europium with humic acid covalently bound to silica beads
- The oxidation of hydroxylamine by nitric and nitrous acids in the presence of technetium (VII)
- Separation of 187,188Pt and 187,188Ir produced in 11B4+ irradiated tantalum target
