鉍(bismuth, Bi)由於擁有較汞更少的毒性以及對環境更具有友善之特性，近年來被考慮為取代汞電極作為電極材料之一。本研究利用電鍍的方式將鉍電鍍於單壁奈米碳管修飾電極上，並使用單壁奈米碳管修飾電極(SWCNT/GCE)以及鉍/單壁奈米碳管修飾電極(Bi/SWCNT/GCE)搭配線性掃描伏安法進行水中鉛(lead, Pb)之分析。透過參數選擇，最佳電解液為0.1 M醋酸緩衝溶液(ABS)，掃描範圍為 -0.8至0伏特，掃描速率為0.2 V/s，最低偵測極限為100 ppb。水中有許多與鉛共存的物質會造成鉛偵測的干擾，因此鄰苯二甲酸氫鉀(KHP)作為水中有機物，另外加入三價鉻、六價鉻與銅於電解液中，並對鉛偵測之干擾現象作探討。當KHP存在於水中，並不會影響Pb的峰電流值。而Cr3+和Cr6+則分別造成Pb的峰電流值下降或上升的情況。由於Cu與Pb競爭碳管上的活性位置會導致Pb的峰電流值下降。本研究使用EDTA降低Cu的干擾，發現EDTA不僅能夠去除Cu的干擾，且會與Pb進行螯合。推測EDTA可用於低Cu濃度的水樣中偵測Pb的存在。;Bi is less toxic than mercury, thus it has been considered as an environmental friendly alternative for mercury-based electrodes. The objective of this paper is to analyze Pb via linear sweep voltammetry (LSV) using single-walled carbon nanotubes (SWCNT/GCE) and bismuth nanoparticle/single-walled carbon nanotubes (Bi/SWNCT/GCE) composite modified glassy carbon electrodes. Bi could be deposited on SWCNT via electroplating. The proper scanning conditions of voltammetry, electrolytes is 0.1 M acetate buffer solution (ABS), scan potential range from -0.8 to 0 V, scan rate is 0.2 V/s, and the detection limit of Pb can achieve 100 ppb. Since there are usually various heavy metal ions and organic matter co-existed in wastewater, the interference, such as potassium hydrogen phthalate (KHP), Cr3+, Cr6+, and Cu2+ would be examined. KHP showed no effects on the Pb peak current. Cr3+ and Cr6+ would decrease and increase the peak current of Pb, respectively. Cu would decrease the Pb peak current for it might compete the active sites of carbon nanotubes. EDTA could be used to eliminate the interference of Cu, but it would also chelates with Pb. It was found that 0.001 mM EDTA can eliminate the interference of Cu, but peak current of Pb might be also decreased to 50%. Thus, EDTA could only be used at low Cu concentration to detect Pb.
