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Redox Behavior of Neptunium(V) in Tributyl Phosphate and N,N-Dihexyl Octanamide Extractants Dissolved in n-Dodecane

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Abstract

Spectrophotometric investigations have been carried out on the disproportionation of Np(V) to form Np(IV) and Np(VI) in 1.1 mol⋅L−1 solutions of tributyl phosphate (TBP) and in N,N-dihexyl octanamide (DHOA) in n-dodecane medium. The Np(V) was found to coordinate with Np(IV) in 1.1 mol⋅L−1 TBP solution in n-dodecane to form a mixed valence “cation–cation” complex by bonding through an axial oxo group on Np(V). By contrast, this interaction was less prominent in the case of 1.1 mol⋅L−1 DHOA solutions. The effect of 1-octanol, added as phase modifier, on the disproportionation behavior of Np(V) was also investigated. An attempt was made to calculate the disproportionation/reduction rate constants for Np(V) under the conditions of these studies. Absorbance measurements on the Np stripped from organic phases revealed the occurrence of Np(V) in the aqueous phase.

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Authors and Affiliations

  1. Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India

    P. N. Pathak, Neelam Kumari & D. R. Prabhu

  2. Department of Energy Science, Sungkyunkwan University, Suwon, 440746, Korea

    V. K. Manchanda

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  1. P. N. Pathak
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  2. Neelam Kumari
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  3. D. R. Prabhu
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  4. V. K. Manchanda
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Correspondence to P. N. Pathak.

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Pathak, P.N., Kumari, N., Prabhu, D.R. et al. Redox Behavior of Neptunium(V) in Tributyl Phosphate and N,N-Dihexyl Octanamide Extractants Dissolved in n-Dodecane. J Solution Chem 41, 410–421 (2012). https://doi.org/10.1007/s10953-012-9807-6

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