Ascorbic acid has been considered as a strong antioxidant indicating a potential reductant for the source of electrons. In this study, the hexavalent chromium [Cr(VI)] reduction rate in the presence of ascorbic acid was examined. Different amount of ascorbic acid was introduced to 25mg/L of Cr(VI) solution, and the concentration of Cr(VI) was monitored as a function of time. The amount of Cr(VI) in the solution was determined directly using an Aquamate 8000 UV-Vis spectrophotometer at 352.0 nm. Most experiments were performed at room temperature without pH control. To study the pH effects on the Cr(VI) reduction rate by ascorbic acid, either 0.01M 2-[4-(2-hydroxyethyl)piperazin-1-yl]ethanesulfonic acid (HEPES) buffer or 0.0025M hydrochloric acid (HCl) solution was used. It was observed that the hexavalent chromium was reduced in the presence of ascorbic acid following pseudo first order reaction. The initial concentration of the introduced ascorbic acid and the solution pH are the major factors controlling the Cr(VI) reduction rate.

Reduction rate of the hexavalent chromium in the presence of ascorbic acid: Kinetic study

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.