Voltammetry of maleic acid in aqueous and mixed environments.

Autor: Kvaratskheliya, R., Kvaratskheliya, E.
Zdroj: Russian Journal of Electrochemistry; Aug2000, Vol. 36 Issue 8, p909-912, 4p
Abstrakt: The electrochemical behavior of maleic acid is studied on rotating disk electrodes and stationary electrodes of individual Cu, Cd, Pt, and Ta metals, Cu and Cd amalgams, and Cd alloys with Sn, Cu, In, Pb, Ni, and Ag in aqueous solutions and water mixtures with acetone, acetonitrile, ethanol, dimethylformamide, and pyridine. Basic kinetic parameters for the maleic acid reduction to succinic acid are determined. Depending on the solution composition, all three forms of maleic acid (nondissociated acid, monoanion, dianion) may undergo reduction. The difference between diffusion coefficients and kinetic reduction parameters of the acid and monoanion is insignificant and that of the monoanion and dianion is noticeable. This is due to an intramolecular hydrogen bond in the monoanion, which decreases the negative charge on its anion center. The effect the electrode nature and the mixed-media composition have on the maleic acid reduction kinetics is discussed [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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