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Behavior of Np(VII, VI, V) in silicate solutions

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Abstract

Properties of Np(VII, VI, V) in silicate solutions were studied spectrophotometrically. In noncomplexing media, the Np(VII) cation transforms into the anionic species at pH 5.5–7.5. In the presence of carbonate ions, this rearrangement occurs at pH 10–11.5, and in silicate solutions, at pH 10.5–12.0. These data show that Np(VII) cation forms complexes with carbonate and silicate ions, the latter being stronger. From the competitive reactions of Np(VI) complex formation with carbonate and silicate ions, the stability of NpO2SiO3 complex was estimated (log β = 16.5) using the known stability constant of NpO2(CO3) 4−3 . Complexation of Np(V) with SiO 2−3 ions was not detected by the methods used.

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Authors and Affiliations

  1. Institute of Physical Chemistry, Russian Academy of Sciences, Moscow, Russia

    V. P. Shilov, A. M. Fedoseev & A. B. Yusov

  2. Pacific Northwest National Laboratory, Richland, Washington, USA

    C. H. Delegard

Authors
  1. V. P. Shilov
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  2. A. M. Fedoseev
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  3. A. B. Yusov
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  4. C. H. Delegard
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Translated from Radiokhimiya, Vol. 46, No. 6, 2004, pp. 527–530.

Original Russian Text Copyright © 2004 by Shilov, Fedoseev, Yusov, Delegard.

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Shilov, V.P., Fedoseev, A.M., Yusov, A.B. et al. Behavior of Np(VII, VI, V) in silicate solutions. Radiochemistry 46, 574–577 (2004). https://doi.org/10.1007/s11137-005-0030-9

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  • DOI: https://doi.org/10.1007/s11137-005-0030-9

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