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標題Title: The Effect of the pH of Phosphate Buffer Solution on the Detection of Hydrogen Peroxide for the Carbon Paste Electrode Modified with Ruthenium Hexacyanoferrate
作者Authors: 連崇閔,廖國翔 ..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 Buffer Solution, Ruthenium Hexacyanoferrate, Carbon Powders, Carbon Paste Electrode, Glucose, Biosensor
摘要Abstract: Developing a hydrogen peroxide sensor which can detect hydrogen peroxide rapidly and conveniently is an important research subject. A study was conducted to use the ruthenium hexacyanoferrate(Ⅱ) to modify carbon paste electrode which was used as the working electrode to detect the responding current of reduction of hydrogen peroxide in the phosphate buffer solution and the sensitivity of detection of hydrogen peroxide was determined from the responding current .The results showed that the responding current for the carbon paste electrode modified with ruthenium hexacyanoferrate(Ⅱ) was elevated significantly. At 30℃, -200 mV operating potential, 600 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 solutions 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 -200 mV operating potential, 600 rpm stirring rate and in 0.05 M PBS buffer solution ( pH = 7.4 ) , when the carbon paste electrode was modified with ruthenium hexacyanoferrate(Ⅱ) [ruthenium hexacyanoferrate(Ⅱ) : carbon powders : carbon paste = 0.3:0.7:1 ( weight ratio )] , the detection limit was 0.02 mM H2O2 , the linear range was 0.02~2.7 mM H2O2 , R2 = 0.9996 and the sensitivity was 661.8 µA/cm2.mM H2O2 .



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