Extraction and complex formation of thorium(IV) with 3-hydroxy-2-methyl-1-(4-tolyl)-4-pyridone |
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| Affiliation: | 1. Earth and Life Institute, Soil Science, Université catholique de Louvain (UCLouvain), Croix du Sud 2, L7.05.10, 1348 Louvain-La-Neuve, Belgium;2. CNRS, CEREGE, Aix Marseille Université, IRD, INRAE, 13545 Aix-en-Provence Cedex 04, France;1. National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom;2. Chemistry Department, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom;1. Faculty of Veterinary Medicine, University of Belgrade, Bulevar Oslobođenja 18, 11000 Belgrade, Serbia;2. Science Institute of Veterinary Medicine of Serbia, Vojvode Toze 14, 11000 Belgrade, Serbia;1. Russian Institute of Radiology and Agroecology, Obninsk, Russia;2. Russian Institute of Agricultural Chemistry, Moscow, Russia;3. The Institute of Nuclear Physics, Almaty, Kazakhstan;1. Earth and Life Institute, Soil Science, Université catholique de Louvain (UCLouvain), Croix du Sud 2, L7.05.10, 1348 Louvain-La-Neuve, Belgium;2. CNRS, CEREGE, Aix Marseille Université, IRD, INRAE,13545 Aix-en-Provence Cedex 04, France |
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| Abstract: | The extraction of thorium(IV) from aqueous hydrochloric and nitric acid solution by 3-hydroxy-2-methyl-1-(4-tolyl)-4-pyridone (HY) dissolved in chloroform has been studied. Thorium(IV) is quantitatively extracted at pH > 3.8 from the hydrochloric acid solution containing an excess of chloride ions, and at pH > 2.5 from nitric acid solution containing an excess of nitrate ions. Extracted thorium can be quantitatively stripped with 1 M hydrochloric or nitric acid. The separation of protactinium from thorium is described. The mechanism of thorium extraction has been studied. The composition of the extractable thorium complexes depends on the HYTh concentration ratio and on the kind of mineral acid present in the aqueous phase. The solid complex ThCl3Y·HY was isolated and its composition verified by chemical analysis. |
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