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Stability constants of Np(V) complexes with fluoride and sulfate at variable temperatures

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Summary

A solvent extraction method was used to determine the stability constants of Np(V) complexes with fluoride and sulfate in 1.0M NaClO4 from 25 to 60 °C. The distribution ratio of Np(V) between the organic and aqueous phases was found to decrease as the concentrations of fluoride and sulfate were increased. Stability constants of the 1 : 1 Np(V)-fluoride complexes and the 1 : 1 Np(V)-sulfate and 1 : 2 Np(V)-sulfate complexes, dominant in the aqueous phase under the experimental conditions, were calculated from the effect of [F-] and [SO42-] on the distribution ratio. The enthalpy and entropy of complexation were calculated from the stability constants at different temperatures by using the Van't Hoff equation.

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Authors and Affiliations

  1. Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA

    Y. Xia

  2. Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA

    J. I. Friese

  3. Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA

    D. A. Moore

  4. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA

    L. Rao

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  1. Y. Xia
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  2. J. I. Friese
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  3. D. A. Moore
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  4. L. Rao
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Xia, Y., Friese, J., Moore, D. et al. Stability constants of Np(V) complexes with fluoride and sulfate at variable temperatures. J Radioanal Nucl Chem 268, 445–451 (2006). https://doi.org/10.1007/s10967-006-0189-3

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  • DOI: https://doi.org/10.1007/s10967-006-0189-3

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