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Extraction of U(VI), Zr(IV) and Th(IV) from perchlorate media, by PC-88A

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Extraction of U(VI), Zr(IV) and Th(IV) has been investigated from perchlorate media using 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (PC-88A) dissolved in toluene. The extraction of U(VI), Zr(IV) and Th(IV) was found to be quantitative in the pH range 1.6 to 3.2, 2.0 to 4.7 and 2.3 to 3.8, respectively, with 3.0.10-3, 5.6.10-4 and 1.0.10-2M PC-88A dissolved in toluene. U(VI) was stripped with 4.0M HCl, Zr(IV) with 2.5M NaF and Th(IV) with 8.0M HCl from the metal loaded organic phase containing PC-88A dissolved in toluene. The probable extracted species have been ascertained by plotting log D vs. log [HR] as UO2R2 .2HR, ZrR4 .2HR and ThR4 .4HR, respectively. U(VI) was separated from Zr(IV) and Th(IV) and from other associated metals. This method was proved by the determination of U(VI) in some real samples.

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  1. Inorganic Chemistry Laboratory, Applied Chemistry Division, Department of Chemical Technology, University of Mumbai, Matunga. Mumbai, 400 019, India

    R. K. Singh & P. M. Dhadke

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  1. R. K. Singh
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  2. P. M. Dhadke
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Singh, R.K., Dhadke, P.M. Extraction of U(VI), Zr(IV) and Th(IV) from perchlorate media, by PC-88A. Journal of Radioanalytical and Nuclear Chemistry 254, 607–612 (2002). https://doi.org/10.1023/A:1021666827517

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