Complexation of Np(V) with Silicate Ions |
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| Authors: | A B Yusov A M Fedoseev O V Isakova C H Delegard |
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| Affiliation: | (1) Institute of Physical Chemistry, Russian Academy of Sciences, Moscow, Russia;(2) Pacific Northwest National Laboratory, Richland, Washington, USA |
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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.__________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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