| 摘要: | 化學需氧量(chemical oxygen demand, COD)及生化需氧量(biochemical oxygen demand, BOD)皆為環境水體有機物污染及水質評估的重要參數，兩者的傳統分析方法存在許多缺點，然而電化學方法不僅有快速分析、環境友善及高靈敏度等優點，且可應用於現場監測及分析。本研究使用溶膠-凝膠法製備 TiO2/SWCNT (titanium dioxide/single walled carbon nanotubes)奈米複合材料，並用於修飾網版印刷電極(screen-printed electrode, SPE)。透過線性掃描伏安法(linear sweep voltammetry, LSV)分別對模擬水樣及實際水樣進行 BOD 及 COD 分析。單一化合物模擬水樣由鄰苯二甲酸氫鉀、水楊酸、4-硝基苯酚、甘氨酸、菸鹼酸及結晶紫配製，經 LSV 分析得到的峰值電流及峰面積皆與理論需氧量及 BOD5 呈現正相關。最後進行實際水樣分析，分別選用中大湖、百花川、桃園北區水資源回收中心及經濟部平鎮產業園區污水處理廠之廢水進行電化學分析，發現大部分的水樣中，LSV 、 BOD5 及 CODCr 具有相似的趨勢，且修飾電極經電化學活性面積校正後，可以很好地測定不同月份工業區之放流水。對於修飾電極的再現性分析，相對標準偏差為2.72%，證明所開發的電極具良好的再現性。;Chemical oxygen demand (COD) and biochemical oxygen demand (BOD) are crucial parameters for assessing organic pollutantion and water quality. Traditional methods for analyzing these parameters have several drawbacks. Electrochemical methods offer advantages such as rapid analysis, environmental friendliness, high sensitivity, and can be applied for on-site monitoring. In this study, TiO2/SWCNT (titanium dioxide/single-walled carbon nanotubes) nanocomposites were prepared using the sol-gel method and used to modify screen-printed electrodes (SPE). BOD and COD analyses were conducted on both synthetic and real water samples using linear sweep voltammetry (LSV). The synthetic water samples were prepared using potassium hydrogen phthalate, salicylic acid, 4-nitrophenol, glycine, nicotinic acid, and crystal violet. The peak current and peak area obtained from LSV analysis showed a positive correlation with the theoretical oxygen demand and BOD5. Finally, actual water samples, including samples from Zhongda Lake, Baihua River, North District Water Resource Center of Taoyuan, and the wastewater treatment plants of the Pingzhen Industrial Park, were subjected to electrochemical analysis. It was observed that, in most water samples, the relationship between of LSV and BOD5, as well as CODCr were similar. After electrochemical active surface area correction, the method developed in this work could determine BOD of the effluen from the wastewater treatment plant of Pingzhen industrial park. The reproducibility analysis of the modified electrode showed a relative standard deviation of 2.72%, demonstrating that the developed electrode has excellent reproducibility. |
