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- W2950201400 abstract "Voltammetry of U(VI) at graphite electrodes in aqueous media containing magnesium chloride electrolyte consists of two chemically reversible major processes within the pH range 2.4 to 6.6. The dominant process at low pH is observed in the potential region of about 0 to [minus]0.3 V (vs. SCE) under conditions of cyclic voltammetry and is assigned to the reaction UO[sub 2][sup 2+](aq) + e[sup [minus]] [yields] UO[sub 2][sup +] (adsorbed). This process is progressively replaced by another response over the potential range [minus]0.6 to [minus]0.8 V (vs. SCE) as the pH is increased and UO[sub 2][sup 2+] is hydrolyzed to [(UO[sub 2])[sub x](OH)[sub y]][sup (2x[minus]y)+]. The second process is also a U(VI)/U(V) process represented by the equation [(UO[sub 2])[sub x](OH)[sub y]][sup (2x[minus]y)+] + e[sup [minus]] [leftrightarrow] [(UO[sub 2])[sub x](OH)[sub y]][sup (2x[minus]y[minus]1)+]. Interestingly, many of the characteristics of the second process are closely related to reduction of solid uranium oxide compounds, such as U[sub 3]O[sub 8], [alpha]-UO[sub 3], and [gamma]-UO[sub 3], mechanically attached to graphite electrodes, where diffusion of inserted magnesium ions from the electrolyte, rather than diffusion of solution soluble U(VI) complexes, provides the mass-transport mechanism. The fact that similar reversible U(VI)/U(V) reduction potential and voltammetric characteristics are observed for solidmore » oxides and hydrolyzed forms of UO[sub 2][sup 2+] suggests that common features of the electron transfer process occur in all of the basic forms of U(VI). Voltammetric reduction of U(VI) compounds at graphite electrodes in magnesium chloride electrolyte seems to be inherently simpler than reported at other electrodes in that it is dominated by chemically reversible U(VI)/U(V) electron transfer processes.« less" @default.
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- W2950201400 date "2010-08-19" @default.
- W2950201400 modified "2023-09-23" @default.
- W2950201400 title "ChemInform Abstract: Cyclic Voltammetry of the Uranyl Ion in Magnesium Chloride Electrolyte at a Graphite Electrode in Weakly Acidic and Neutral Solutions." @default.
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- W2950201400 doi "https://doi.org/10.1002/chin.199420018" @default.
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