Extraction thermodynamics of Th(IV) in various aqueous organic systems |
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| Authors: | F.H. El-Sweify A.A. Abdel-Fattah S.M. Ali |
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| Affiliation: | Nuclear Chemistry Department, Radioisotopes Prod. Division, Hot Lab. Centre, Atomic Energy Authority, P.O. No. 13759, Cairo, Egypt |
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| Abstract: | Thermodynamic studies on solvent extraction of Th(IV) have been carried out using TBP and HDEHP as extractants in toluene from aqueous bromide and iodide media containing Arsenazo-III as a colouring reagent. This reagent was used for the spectrophotometric determination of Th(IV). The study was carried out at T = {(283, 298, 313) ± 1} K to evaluate lg Kex as well as the thermodynamic functions ΔG°, ΔH°, and ΔS° of the extraction reactions. The extracted species and the overall extraction mechanisms are postulated. |
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