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Some remarks on the extraction of Pu(IV) and Th with tridodecylamine from nitric acid soil leach solutions and the possible existence of a univalent anionic Th-nitrate complex

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Abstract

The extraction of Pu(IV) and Th with tridodecylamine—xylene mixtures from about 6M nitric acid soil leach solutions was studied as a function of the chemical composition of the aqueous phase (iron and calcium concentration, acidity) and the amine concentration in the extractant. No correlation was found between the partition coefficients of Pu(IV) and Th and the composition parameters mentioned above at any of the amine concentrations examined. The slope, in a bilogarithmic plot, of the partition coefficients versus the amine concentrations was found to be close to 2 for Pu(IV) as well as Th in pure 6.5M nitric acid solution, thus indicating the presence of the complexes Pu(NO3) 2−6 and Th(NO3) 2−6 in the extract. When the pure nitric acid solution was replaced by soil leach solutions of similar molarity in HNO3, the slope remained 2 for Pu(IV), but changed to 1.5 for Th. A possible reason for this slope yielded by Th may be the coexistence of the complexes Th(NO3) 2−6 and Th(NO3) −5 in the extraction phase.

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  1. IAEA Laboratory Seibersdorf, A-2444, Seibersdorf, (Austria)

    J. C. Veselsky

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  1. J. C. Veselsky
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Veselsky, J.C. Some remarks on the extraction of Pu(IV) and Th with tridodecylamine from nitric acid soil leach solutions and the possible existence of a univalent anionic Th-nitrate complex. J. Radioanal. Chem. 46, 247–253 (1978). https://doi.org/10.1007/BF02519891

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  • DOI: https://doi.org/10.1007/BF02519891

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