Ru(III)-EDTA catalyzed oxidation of ascorbic acid by hydrogen peroxide in aqueous solution |
| |
| Affiliation: | 1. Institute of Microelectronics, Hebei University of Technology, Tianjin 300130, China;2. China Mobile Group Design Institute Co., Ltd, Beijing Branch, Beijing 102600, China;1. School of Electronic Information Engineering, Hebei University of Technology, Tianjin 300130, PR China;2. Tianjin Key Laboratory of Electronic Materials and Devices, Tianjin 300130, PR China;3. Tianjin Institute of Metrology Supervision and Inspection, Tianjin 300130, PR China;1. Department of Materials Science and Engineering, The University of Arizona, Tucson, AZ 85719, United States;2. Department of Physics, The University of Arizona, Tucson, AZ 85719, United States;3. Department of Chemical and Environmental Engineering, The University of Arizona, Tucson, AZ 85719, United States;1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China;2. College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China;3. College of Resources and Environment, Southwest University, Chongqing 400715, China;4. Institute of Soil and Water Conservation, Chinese Academy of Sciences, Ministry of Water Resources, Yangling, Shaanxi 712100, China;1. College of Environmental Science and Engineering, Taiyuan University of Technology, 79 Yingze Street, Wanbailin District, Taiyuan 030024, China;2. Department of Chemistry, Bohai University, Jinzhou 121013, China;3. Shanxi Provincial People''s Hospital, Taiyuan 030012, China;4. School of Mechanical Engineering, University of Western Australia, 35 Stirling, Australia;1. School of Electronics and Information Engineering, Hebei University of Technology, Tianjin 300130, PR China;2. Tianjin Key Laboratory of Electronic Materials and Devices, Hebei University of Technology, Tianjin 300130, PR China;3. Institute of Polymer Science and Engineering, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300041, PR China;4. Hebei Key Laboratory of Functional Polymers, Hebei University of Technology, Tianjin 300041, PR China |
| |
| Abstract: | The kinetics of oxidation of ascorbic acid to dehydroascorbic acid by hydrogen peroxide catalyzed by ethylenediaminetetraacetatoruthenate(III) has been studied over the pH range 1.50 – 2.50, at 30°C and μ = 0.1 M KNO3. The reaction has a first-order dependence on ascorbic acid and Ru(III)-EDTA concentrations, an inverse first-order dependence on hydrogen ion concentration, and is independent of hydrogen peroxide concentration in the pH range studied. A mechanism has been proposed in which ascorbate anion forms a kinetic intermediate with the catalyst in a pre-equilibrium step. Ruthenium(III) is reduced to ruthenium(II) in a rate-determining step and is reoxidized with hydrogen peroxide back to the Ru(III) complex in a fast step. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
