Solvent extraction of thorium(IV) with dibutyldithiophosphoric acid in various organic solvents |
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Authors: | M Curtui I Haiduc |
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Institution: | (1) Chemistry Department, Babes-Bolyai University, R-3400 Cluj-Napoca, Romania |
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Abstract: | The extraction of thorium(IV) from perchlorate solutions with di-n-butyldithiophosphoric acid (HBudtp) in various organic solvents occurs through an ion exchange mechanism. The extracted species in the organic phase is an eight-coordinate complex Th(Budtp)4. The higher values of the distribution ratio obtained in HBudtp-benzene-water system than in HBudtp-n-butanol-water system are explained by higher solubility of the complex species in nonpolar solvents. The position of the extraction curves in the pH-range lower than 0.7 reduces the complexation of thorium(IV) with Budtp– in the aqueous phase and also the hydrolysis process. |
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