Table of Contents
Research Letters in Inorganic Chemistry
Volume 2008, Article ID 314045, 4 pages
Research Letter

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

College of Chemistry and Environmental Science, Hebei University, Baoding 071002, Hebei Province, China

Received 22 September 2008; Accepted 23 November 2008

Academic Editor: Rabindranath Mukherjee

Copyright © 2008 Jinhuan Shan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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 ( [ L a c ] 0 [ C r ( V I ) ] 0 ) , the observed rate constant ( 𝑘 o b s ) 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.