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Kinetics and Mechanism of Oxidation of Lactic Acid by Dihydroxyditelluratoargentate(Ⅲ) in Alkaline Medium 被引量:1

Kinetics and Mechanism of Oxidation of Lactic Acid by Dihydroxyditelluratoargentate(Ⅲ) in Alkaline Medium
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摘要 The kinetics of the oxidation of lactic acid(Lac) by dihydroxyditelluratoargentate(Ⅲ)[abbreviated as DDA of Ag(Ⅲ)] anions was studied in an aqueous alkaline medium by conventional spectrophotometry in a temperature range of 25- 40 ℃ . The order of the redox reaction of lactic acid and DDA was found to be first order. The rates increased with the increase in and decreased with the increase in . No free radical was detected. In the view of this the dihydroxymonotelluratoargentate(Ⅲ) species(DMA) is assumed to be the active species. A plausible mechanism involving a two electron transfer is proposed, and the rate \{equation\} derived from the mechanism can be used to explain all the experimental results. The activation parameters(25 ℃) and the rate constants of the rate determining step along with the preequilibrium constants at different temperatures were evaluated. The kinetics of the oxidation of lactic acid(Lac) by dihydroxyditelluratoargentate(Ⅲ)[abbreviated as DDA of Ag(Ⅲ)] anions was studied in an aqueous alkaline medium by conventional spectrophotometry in a temperature range of 25- 40 ℃ . The order of the redox reaction of lactic acid and DDA was found to be first order. The rates increased with the increase in and decreased with the increase in . No free radical was detected. In the view of this the dihydroxymonotelluratoargentate(Ⅲ) species(DMA) is assumed to be the active species. A plausible mechanism involving a two electron transfer is proposed, and the rate \{equation\} derived from the mechanism can be used to explain all the experimental results. The activation parameters(25 ℃) and the rate constants of the rate determining step along with the preequilibrium constants at different temperatures were evaluated.
出处 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2003年第2期219-221,共3页 高等学校化学研究(英文版)
基金 Supported by the National Natural Science Foundation of Hebei Province(No.2 95 0 6 6 )
关键词 Dihydroxyditelluratoargentate(Ⅲ) Lactic acid Kinetics and mechanism Redox reaction Dihydroxyditelluratoargentate(Ⅲ) Lactic acid Kinetics and mechanism Redox reaction
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  • 1Kirschenbaum L. J. J.I norg[].Nucl Chem.1976
  • 2Feigl F.Spot Tests in Organic Analysis, Elsevier Publishing Co[].New York.1956
  • 3NIU W. J. ZHU Y. HU K. C. et al. International Journal of Chemical Kinetics . 1 996

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