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Complexation of neptunium(V) with fluoride in aqueous solutions at elevated temperatures

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Abstract

Complexation of neptunium(V) with fluoride in aqueous solutions at elevated temperatures was studied by spectrophotometry and microcalorimetry. Two successive complexes, NpO2F(aq) and NpO2F −2 , were identified by spectrophotometry in the temperature range of 10–70°C. Thermodynamic parameters, including the equilibrium constants and enthalpy of complexation between Np(V) and fluoride at 10–70°C were determined. Results show that the complexation of Np(V) with fluoride is endothermic and that the complexation is enhanced by the increase in temperature — a two-fold increase in the stability constants of NpO2F(aq) and more than five-fold increase in the stability constants of NpO2F −2 as the temperature is increased from 10 to 70°C.

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Authors and Affiliations

  1. Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA

    G. Tian & L. Rao

  2. Pacific Northwest National Laboratory, Richland, WA, 99352, USA

    Y. Xia & J. I. Friese

Authors
  1. G. Tian
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  2. L. Rao
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  3. Y. Xia
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  4. J. I. Friese
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Correspondence to L. Rao.

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Tian, G., Rao, L., Xia, Y. et al. Complexation of neptunium(V) with fluoride in aqueous solutions at elevated temperatures. J Therm Anal Calorim 95, 415–419 (2009). https://doi.org/10.1007/s10973-008-9248-z

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  • DOI: https://doi.org/10.1007/s10973-008-9248-z

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