| 摘要: | 隨著工業的發展，人為活動產生的金屬比自然產生的金屬造成更多的環境污染。當銅進入水體後，其高生物累積性並且不容易被生物代謝的特性將造成嚴重的危害。過量的銅攝取可能導致一些疾病，包括威爾遜氏病，門克斯綜合症，阿爾茨海默氏病，神經退行性疾病，癌症等。因此開發快速、準確之Cu2+檢測技術成為一個重要議題。電化學伏安法技術能夠實現即時現地分析，相較於目前重金屬分析方法耗時長、樣品需要前處理、且無法即時反應水質狀況，其展現了操作簡單、快速且靈敏等特性受到廣泛關注。
本研究以冠醚為選擇性材料，開發12-Crown-4/氧化石墨烯/單壁奈米碳管修飾玻璃碳電極 (12-Crown-4/GO/SWCNT/GCE) 進行線性掃描陽極析出伏安法 (LSASV) 測定溶液中的Cu2+。以最佳化的參數及程序在0.1M醋酸鹽緩衝溶液 (pH 5)中以-1.2 V電壓施加120秒達到預濃縮效果，並在電位範圍-0.5 V~0.3 V以0.15 V s?1的掃描速率進行線性掃描。得到Cu2+的線性濃度範圍為50 μg L-1至1000 μg L-1， 相關係數為0.9989，具有良好的線性關係，偵測極限 (LOD) 為15.01 μg L-1。除此之外亦在地下水及都市汙水放流水中得到良好的回收率。
;With the development of industry, metals produced by human activities cause more environmental pollution than metals produced naturally. When copper enters the water system, its high bioaccumulation and hard to be metabolized by organisms will cause serious harm. Excessive copper ingestion may cause several diseases, including Wilson′s disease, Menkes syndrome, Alzheimer′s disease, neurodegenerative diseases, cancer, etc. Therefore, the development of simple and rapid Cu2+ detection technology has become an important issue. While traditional heavy metal analysis methods are usually time-consuming, need complicated pre-treatment, and cannot reflect the water quality immediately. Electrochemical voltammetry technology is valued due to its simplicity, rapid analysis, and sensitive. Also, electrochemical voltammetry can be performed on-site.
In this study, crown ether was used as a selective material to develop a 12-Crown-4/graphene oxide/single-wall carbon nanotube modified glassy carbon electrode (12-Crown-4/GO/SWCNT/GCE) to measures Cu2+ in solution by linear scanning anodic stripping voltammetry (LSASV). The optimal pre-concentration condition was -1.2 V in a 0.1 M acetate buffer solution (pH 5) for 120 seconds. The optimal LSV operation parameters were -0.5 V to 0.3 V at the scan rate 0.15 V s?1. The linear concentration range of Cu2+ is 50 μg L-1 to 1000 μg L-1, the correlation coefficient is 0.9985, which has a good linear relationship, and the limit of detection (LOD) is 15.01 μg L-1. In addition, modified electrode was successfully applied to the determination of copper in groundwater and MWTP effluent. |
