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標題Title: The Effect of Operating Potential on the Sensitivity of Detection of Hydrogen Peroxide for the Carbon Paste Electrode Modified with Chromium Hexacyanoferrate
作者Authors: 林庭立,胡真熏 ..等
上傳單位Department: 化學工程與材料工程系
上傳時間Date: 2011-5-29
上傳者Author: 林庭立
審核單位Department: 化學工程與材料工程系
審核老師Teacher: 林浩
檔案類型Categories: 論文Thesis
關鍵詞Keyword: Chromium Hexacyanoferrate, Carbon Paste Electrode, Operating Potential, Sensitivity, Hydrogen Peroxide
摘要Abstract: Because the Chromium Hexacyanoferrate possesses the excellent catalytic characteristic, it can be used with the graphite carbon powders and carbon paste to make the carbon paste electrode to elevate the sensitivity of responding current of hydrogen peroxide. The responding current of hydrogen peroxide can be detected in phosphate buffer solution (PBS) and then the concentration of hydrogen peroxide can be determined. The glucose and oxygen can be catalyzed by the glucose oxidase and the glucose is oxidized to gluconic acid and the oxygen is reduced to hydrogen peroxide. Therefore, as the concentration of hydrogen peroxide can be determined the concentration of the glucose can also be determined. A study was conducted to use the Coprecipitation method to prepare the Chromium Hexacyanoferrate . The Chromium Hexacyanoferrate was used to modify the carbon paste electrode [ Chromium Hexacyanoferrate : graphite carbon powders = 3 : 7(weight ratio)] to elevate the sensitivity of responding current of detection of hydrogen peroxide. The CV ( Cyclic Voltammetry ) diagrams were plotted for the carbon paste electrode modified with Chromium Hexacyanoferrate ( Chromium Hexacyanoferrate : graphite carbon powders : carbon paste = 0.3 : 0.7 : 1) and the unmodified carbon paste electrode. The results showed that the responding current for the carbon paste electrode modified with Chromium Hexacyanoferrate was elevated significantly. At 30℃, 700rpm stirring rate and in 0.05 M phosphate buffer solution (pH=7.4), the TB (Time Base) graphs for the carbon paste electrode at different operating potentials were plotted to evaluate the effect of the operating potential on the responding current of detection of hydrogen peroxide. At the optimum operating conditions -200mV operating potential, 700 rpm stirring rate and in 0.05M PBS buffer solution ( pH = 7.4 ) , the detection limit was 0.02 mM H2O2 , the linear range was 0.02~2.8 mM H2O2 , R2 = 0.9999 and the sensitivity was 242.57µA/cm2.mM H2O2.


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