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Kinetic and Mechanistic Study of the Reduction of Chromium(VI) by Lactic Acid

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Author(s): Jinhuan Shan | Fang Wang | Changying Song | Heye Wang

Journal: Research Letters in Inorganic Chemistry
ISSN 1687-6806

Volume: 2008;
Date: 2008;
Original page

ABSTRACT
The kinetics and mechanism of the reduction of chromium(VI) by lactic acid (Lac) in aqueous acidic medium was studied with spectrophotometry in a temperature range of 298.15 K~313.15 K. Under the conditions of the pseudo-first order ([Lac]0≫[Cr(VI)]0), the observed rate constant (kobs) increased with the increase in [Lac] and [H+]. There is no salt effect. Based on the experimental results, a probable reaction mechanism of oxidation was proposed. The rate equation derived from the mechanism could explain all the experimental phenomena. Activation parameters along with rate constant of the rate-determining step have been evaluated.
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