Electrochemical and spectroscopic studies of neptunium(VI), -(V) and -(IV) in carbonate-bicarbonate buffers |
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Affiliation: | 1. Laboratoire d''Hydrologie et de Géochimie de Strasbourg, EOST, Université de Strasbourg, CNRS, 1 rue Blessig, 67084 Strasbourg, Cedex, France;2. Laboratoire de Biogéochimie des Ecosystèmes Forestiers, INRA, 54280, Champenoux, France |
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Abstract: | The behavior of neptunium(VI), -(V) and -(IV) in carbonate-bicarbonate buffers (1 M) has been examined electrochemically and spectroscopically. Np(VI) undergoes a one-electron quasi-reversible reduction to Np(V) at +0.22 V vs SSCE Np(V) is reduced irreversibly to Np(IV) at ca. −1.8 V. Although Np(V) is readily oxidized to Np(VI), no oxidation of Np(IV) was observed. Spectroscopic results indicate that the Np(VI)-(V) reaction involves one reactant and one product. The spectrum of Np(IV) in 1 M carbonate-bicarbonate has been quantitatively analyzed. Comparisons to results for uranium under similar conditions are presented. |
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