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標題Title: The pH on the Sensitivity of Detection of Hydrogen Peroxide for the Small Electrode Modified with Meldola’s Blue
作者Authors: 連崇閔,羅濟玟 ..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: 連崇閔
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: 專題報告Project Report
關鍵詞Keyword: pH of Phosphate Solution , Meldola's Blue , Small Electrode , Sensitivity , Hydrogen Peroxide
摘要Abstract: A study was conducted to use the Meldola’s Blue to modify the small electrode. Because the Meldola’s Blue possesses the excellent catalytic characteristic, it can be used with the graphite carbon powders which possesses the excellent conductivity to make the carbon paste electrode and to elevate the responding current of hydrogen peroxide. The responding current of hydrogen peroxide is detected in the phosphate buffer solution(PBS) and then the concentration of the hydrogen peroxide can be obtained and consequently, the concentration of the glucose can be determined. At 30℃, -300 mV operating potential, 500 rpm stirring rate and in 0.05 M phosphate buffer solution (PBS), the TB (Time Base) graphs for the carbon paste electrode at different pH of buffer solution were plotted to evaluate the effect of pH of buffer solution on the responding current of detection of hydrogen peroxide. At the optimum operating conditions -300 mV operating potential, 500 rpm stirring rate and in 0.05 M PBS buffer solution ( pH = 7.4 ) , when the carbon paste electrode was modified with Meldola’s Blue [Meldola’s Blue : carbon powders : carbon paste = 2 :15 :15 ( weight ratio )] , the detection limit was 0.02 mM H2O2 , the linear range was 0.02~1.4 mM H2O2 , R2 = 0.9994 , the sensitivity was 159.39 µA/cm2.mM H2O2, and the average responding current was 2.54µA.






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