Kinetics and Mechanism of Oxidation of Lactic Acid by Dihydroxyditelluratoargentate(Ⅲ)in Alkaline Medium |
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作者姓名: | SHANJin-huan WANGLi LIUBao-sheng SHENShi-gang |
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作者单位: | CollegeofChemistryandEnvironmentScience,HebeiUniversity,Baoding071002,P.R.China |
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基金项目: | Supported by the National Natural Science Foundation of Hebei Province(No.2 95 0 6 6 ) |
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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 OH^-]and decreased with the increase in tellurate].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 experimenttal results.The activation parameters(25℃)and the rate constants of the rate-determining step along with the preequilibrium constants at different temperatures were evaluated.
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关 键 词: | 动力学 乳酸 氧化 碱性介质 分光光度法 银配合物 |
收稿时间: | 2001-07-21 |
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