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Complexation of Np(V) with Silicate Ions

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Abstract

It was shown that Np(V) forms complexes with anions of orthosilicic acid and other silicate ions at pH higher than 8–8.5. At pH < 9.5, the reaction is mainly described by the equation NpO +2 + OSi(OH) −3 ⇄ NpO2OSi(OH)3; the stability constant of the NpO2OSi(OH)3 complex is equal to log β1 = 2.1 ± 0.3. Thus, interaction is weak and hardly significant under real conditions. Carbonate ions in equilibrium with air at pH > 8.5 are the substantially stronger ligands for NpO +2 , and in their presence it is impossible to reveal Np(V) complexation with silicate ions.

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Authors and Affiliations

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

    A. B. Yusov, A. M. Fedoseev & O. V. Isakova

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

    C. H. Delegard

Authors
  1. A. B. Yusov
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  2. A. M. Fedoseev
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  3. O. V. Isakova
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  4. C. H. Delegard
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__________

Translated from Radiokhimiya, Vol. 47, No. 1, 2005, pp. 39–43.

Original Russian Text Copyright © 2005 by Yusov, Fedoseev, Isakova, Delegard.

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Yusov, A.B., Fedoseev, A.M., Isakova, O.V. et al. Complexation of Np(V) with Silicate Ions. Radiochemistry 47, 39–44 (2005). https://doi.org/10.1007/s11137-005-0044-3

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  • DOI: https://doi.org/10.1007/s11137-005-0044-3

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