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年度	107	專案性質	實驗性質
專案類別	研究專案	研究主題	調查
申請機構	國立中央大學	申請系所	環境工程研究所
專案主持人	秦靜如	職等/職稱	副教授
專案中文名稱	運用伏安法現場快篩地下水中砷之技術開發
中文關鍵字	奈米碳管, 線性伏安法, 奈米金顆粒
專案英文名稱	Development of votlammetric analysis for in-situ and rapid determination of As
英文關鍵字	Carbon nanotubes, linear scanning voltammetry, gold nanoparticles
執行金額	920,000元
執行期間	2018/1/10 至 2018/11/30
計畫中文摘要	重金屬線上即時監測設備雖已發展有相當長的時間，但由於重金屬離子本身特性及偵測方法的問題而尚無快速且靈敏的檢測技術。相對於放流水等及他地表水，地下水重金屬濃度低，且調查場址除工廠等地區，更有許多是為野外與田間，調查場域寬廣，需要低分析極限但便於攜帶的現地快篩設備，以利於在現場能快速的污染流布有初步認知。本計畫最主要目的為以本研究群過去開發之伏安分析技術為基礎，開發水質快速分析技術，應用於現場水質分析，改良現有As(III)之Au/SWCNT/GCE伏安分析電極，降低對As(III)偵測極限與提高選擇性與靈敏度，並且進一步利用同一類型電極進行As(VI)的分析。本研究成功製備Au-MnOx/SWCNT/GCE電極，利用線性伏安法對As(III)進行分析，所能分析之最低濃度為10 ppb，LOD 為7.04 ppb。在As(V)的分析方面，則以Au/SWCNT/GCE進行方波析出伏安法，可以得到As(V)的反應電流，現階段的分析最低濃度為0.25 ppm。對Cu、Cd、Pb，以及對As(III)的干擾分析，結果顯示除了Pb之外，對偵測As(III)的電流干擾在5%上下，對快篩分析已足夠。地下水水樣的實測發現，在未污染的地下水中，本研究所開發的電極有良好的穩定性，電流與As濃度的關係與在以DI水配製的水樣中相近，表示水中基質對於分析的干擾可以忽略。但在地下水中添加重金屬干擾離子模擬受污染水體的分析發現，可能由於相對濃度較高以及干擾離子的記憶效應，使得對As的分析出現明顯的影響。但由於地下水中As多以As(III)呈現，也因此本研究所開發的電極與分析方法，仍可做為快速篩測地下水中是否有As污染的工具。
計畫英文摘要	Various on-line or in-situ monitoring technologies for heavy metal in water have been developed for years, however, there are still no reliable instruments for rapid and accurate determination of heavy metal ions due to their complicated speciation and reactions. Compared to surface waters, concentrations of heavy metal are very low in groundwater. Also, the contaminated sites may locate in rural area and the amount of samples is large. Therefore, technologies with rapid, low detection limit, and simple usage are necessary for in-situ determination of heavy metal ions in groundwaters. The objective of this work is to enhance the performance of the existing voltammetry technique so that it can be used for the detection of arsenic in groundwater. By modifying the exiting Au/SWCNT/GCE electrode developed from our previous works and by incorporating different voltammetric techniques. Au-MnOx/SWCNT/GCE has been successfully prepared for the As(III) detection via linear scanning voltammetry. The lowest analysis of As(III) was 10 ppb, and the limit of detection (LOD) was 7.04 ppb. For the detection of As(V), square-wave stripping voltammetry with Au/SWCNT/GCE was applied. The lowest analysis of As(V) was 0.25 ppm. The interferences of Cu, Cd, Pb, and Cr were also examined. It was found that, except for Pb, the errors introduced by the presence of those heavy metal ions are around 5%. Analysis for groundwater showed that the fabricated electrodes are stable and the detections of different water samples are similar. This suggests that the influcnes of background ions in groundwater on the detection of As can be neglected. However, when interfernces ions were added into groundwater to examine the performance of the electrodes fabricated in this study, it is found that the interferences become impotant, especially for As(V). This might be because the memory effects of the interferences. But still, according to the errors and detection limits, the Au-MnOx/SWCNT/GCE developed in this work should still be a good tool for rapid and on-site determination of As(III).