重金屬砷具有高毒性，若人體攝入無機砷，可能使罹患皮膚癌、肝癌、膀胱癌和肺癌的風險增加。傳統的水質採樣分析需要前處理和耗費時間，無法即刻反應水質異常，因此需要即時水質分析來有效掌握水處理成效，而伏安法可以快速地得到水質變化。本研究製備複合材料修飾電極，運用伏安法分析使獲得更好偵測砷的靈敏度以及低干擾性。 本研究旨在開發金-錳氧化物/單壁奈米碳管修飾電極(Au-MnOx/SWCNT/GCE)進行三價砷之伏安法分析，首先選定金和錳電沉積在單壁奈米碳管修飾電極上的電鍍程序，再選出最佳製備條件。探討製備的修飾電極進行偵測三價砷的分析性能，以及偵測三價砷時可能受其他重金屬離子干擾的影響。結果顯示，Au-MnOx/SWCNT修飾電極使用線性掃描伏安法偵測三價砷，呈現良好分析性能。本方法之定量極限為10 μg L-1，LOD為7.04 μg L-1，比砷放流水標準(0.5 mg L-1)和飲用水標準(0.01 mg L-1)還低。本研究開發的電極也不受到Cu(II)、Cr(VI)和Cd(II)之干擾。表示此修飾電極運用在水質監測上具有良好的潛力。 ;Arsenic is highly toxic and ingestion by humans may increase the risk of cancer. Traditional water quality analysis require pretreatment and time so it cannot give the results promptly. Therefore, In-situ monitoring is needed to effectively control the water treatment processes. However, the voltammetric method can quickly obtain the change of water quality. In this research, composite modified electrodes were prepared and voltammetric analysis was used to obtain a better detection of arsenic sensitivity and low interference. Au-MnOx/SWCNT modified electrode for arsenic voltammetric analysis is developed in this work. The electroplating procedure of gold and manganese electrodeposited on SWCNT/GCE was selected, then the optimal preparation conditions were selected. The analytical performance of the modified electrode for arsenic detection and the interference of other heavy metal ions in the detection of arsenic were investigated. As a result, Au-MnOx/SWCNT/GCE detects arsenic by LSV and exhibits good analytical performance. The quantification limit is 10 μg L-1 and the LOD is 7.04 μg L-1, which is lower than the effluent standard (0.5 mg L-1) and the drinking water standard (0.01 mg L-1). The electrode developed in this work is also free from the interference of Cu(II), Cr(VI), and Cd(II). In short, such electrode has good potentials in water quality monitoring.
