RT Journal Article
T1 Mechanism of Mercury Electrooxidation in the Presence of Hydrogen Peroxide and Antioxidants
A1 Estévez Brito, Rafael
A1 Rodríguez Mellado, José Miguel
A1 Palma López, Alberto
A1 Ruiz Montoya, Mercedes
A1 Fernández Arteaga, Jesús
AB The oxidation process occurring on mercury electrodes in the presence of hydrogen peroxide has been analized in basic solutions by polarography and voltammetry in their linear scan and differential pulse modes. The process involves Hg(I) ion – in addition to Hg(II) ion – and hydroperoxide radicals, these last formed at trace levels. To demonstrate this radical generation radical scavengers (antioxidants), characterized with the DPPH• radical scavenging assay, were employed. The interaction of the radicals with the antioxidant originate the decrease in signal, but the antioxidant itself does not react with the hydrogen peroxide in the absence of Hg. In the absence of antioxidant, the process is two-electron, being the rate-determining step the second electron transfer; at high concentrations of antioxidant, the oxidation corresponds to a reversible one-electron transfer followed by a chemical reaction between the hydroperoxide radicals and the antioxidant. A reaction scheme is proposed for intermediate antioxidant concentrations.
PB The Electrochemical Society
SN 0013-4651
SN 1945-7111 (electrónico)
YR 2014
FD 2014-09-18
LK https://hdl.handle.net/10272/23350
UL https://hdl.handle.net/10272/23350
LA eng
NO Estévez Brito, R., Rodríguez Mellado, J. M., Palma, A., Montoya, M. R., & Arteaga, J. F. (2014). Mechanism of Mercury Electrooxidation in the Presence of Hydrogen Peroxide and Antioxidants. In Journal of The Electrochemical Society (Vol. 161, Issue 12, pp. H854–H859). The Electrochemical Society. https://doi.org/10.1149/2.1061412jes
DS Repositorio Institucional de la Universidad de Huelva
RD 31 may 2026