Selective extraction of thallium(III) in the presence of gallium(III), indium(III), bismuth(III) and antimony(III) by salting-out of an aqueous mixture of 2-propanol |
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Authors: | Nguyen Huu Chung Osamu Kato |
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Institution: | a Department of Chemistry, Faculty of Sciences and Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan b Analytical Research Center for Experimental Sciences, Saga University, 1 Honjo-machi, Saga 840-8502, Japan c Department of Agricultural Sciences, Faculty of Agriculture, Saga University, 1 Honjo-machi, Saga 840-8502, Japan |
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Abstract: | Thallium(III), in the presence of other triply charged ions such as gallium, indium, bismuth and antimony in aqueous solution, was quantitatively and selectively extracted into 2-propanol/water phase by addition of NaCl ranging from 2.5 to 4.0 mol dm−3. The extraction efficiencies of gallium, indium, bismuth and antimony were much lower than that of thallium(III). Thus a maximal selective separation of thallium(III) from these elements could be attained using a 2-propanol/water mixture. Thallium(III) was extracted as TlCl4− with Na+. The detailed extraction mechanism in the presence of chloride, water in the organic phase and counter ions is discussed. |
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Keywords: | Solvent extraction Separation of thallium Extraction Thallium(III) Salting-out |
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