| Summary: | 碩士 === 南臺科技大學 === 化學工程與材枓工程系 === 107 === Nowadays sometimes preservatives are used in food industry. For example, hydrogen peroxide is one of the preservatives. Hydrogen peroxide has the effect of sterilization and preservation. Therefore, developing a sensor which can detect the amount of hydrogen peroxide rapidly is an important research subject. The Copper Hexacyanoferrate and Nano Silver Powder possess the effect of elevating the responding current of detecting hydrogen peroxide. They can be used with the carbon powder which possesses conductivity to make the carbon paste electrode. At 30 ℃ and 700 rpm stirring rate, a factorial design involving three factors[(A)operating potential (B)Copper Hexacyanoferrate : Nano Silver Powder (C)pH value of phosphate solution] and two levels was conducted to analyze the effect of operating parameters on the sensitivity and average responding current of detecting hydrogen peroxide. The results of analysis of variance showed that the main effects of operating potential (F=113.554, p value < 0.05), Copper Hexacyanoferrate : Nano Silver Powder (F=169.823, p value < 0.05) and pH value of phosphate solution(F=631.982, p value < 0.05) were significant on the sensitivity. The results of factorial design showed that the optimum operating conditions for this study were operating potential = -300 mV, Copper Hexacyanoferrate : Nano Silver Powder = 3 : 2, and the pH value of phosphate solution = 7.4. At 30℃, 700 rpm stirring rate, and the pH value of phosphate solution = 7.4, the carbon paste electrode was modified by Copper Hexacyanoferrate and Nano Silver Powder [ Copper Hexacyanoferrate：Carbon Powder：Carbon Paste：Nano Silver Powder = 3：7：10：2 ] to detect the sensitivity and average responding current of hydrogen peroxide. At the optimum operating conditions, the detection limit was 0.03 mM H2O2, the linear range was 0.03 ~ 2.0 mM H2O2, R2 = 0.9914 and the sensitivity was 299.50 μA / cm2．mM H2O2.
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