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Reduction of hexavalent chromium by ascorbic acid in aqueous solutions
Xiang-Rong Xu1, Hua-Bin Li, Xiao-Yan Li
1Laboratory of Environmental Toxicology, Department of Ecology & Biodiversity, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, PR China.
Chemosphere
|October 19, 2004
Summary
Hexavalent chromium (Cr(VI)) contamination can be effectively remediated using vitamin C. This non-toxic, water-soluble compound efficiently reduces toxic Cr(VI) to less harmful Cr(III) in soils and groundwater across various conditions.
Area of Science:
- Environmental Science
- Green Chemistry
- Toxicology
Background:
- Hexavalent chromium (Cr(VI)) is a priority pollutant globally.
- Cr(VI) poses significant environmental and health risks due to its toxicity, mobility, and bioavailability.
- Reduction to trivalent chromium (Cr(III)) is environmentally favorable, yielding a less toxic and less mobile species.
Purpose of the Study:
- To investigate the efficacy of ascorbic acid (vitamin C) as a reductant for Cr(VI) remediation.
- To determine the optimal conditions for Cr(VI) reduction by vitamin C.
Main Methods:
- Studied the reduction of Cr(VI) using potassium dichromate as a model pollutant.
- Examined the effects of vitamin C concentration, pH, temperature, irradiation, and reaction time.
- Assessed the reduction process in both acidic and weakly alkaline solutions, under light and in darkness.
Main Results:
- Ascorbic acid effectively reduces Cr(VI) to Cr(III).
- Reduction occurs across a wide pH range, including weakly alkaline conditions.
- The process is effective both with and without light irradiation.
- Vitamin C's properties (non-toxic, water-soluble, soil-permeable) enhance its remediation potential.
Conclusions:
- Vitamin C is a viable, non-toxic agent for Cr(VI) remediation.
- Effective remediation of Cr(VI)-contaminated soils and groundwater is achievable using vitamin C.
- The remediation process is versatile, functioning under diverse environmental conditions (pH, light).