| MWCNTs-IL-SPCE传感器检测茶叶中痕量铅研究 |
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| 引用本文： | 徐旭明,窦文超,赵广英.MWCNTs-IL-SPCE传感器检测茶叶中痕量铅研究[J].茶叶科学,2011,31(6):485-492. |
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| 作者姓名： | 徐旭明 窦文超 赵广英 |
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| 作者单位： | 浙江工商大学食品与生物工程学院;浙江省食品安全重点实验室,浙江杭州310035 |
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| 摘 要： | 研究构建了一种新型、高灵敏性和高选择性的电化学传感器,结合差分脉冲溶出伏安法快速检测茶叶样品中的痕量铅.采用超传导性粘结剂离子液体 1-丁基-3-甲基咪唑六氟磷酸盐(BMIM]PF6)和功能化的多壁碳纳米管(MWCNTs)修饰丝网印刷碳电极,提高了电极表面的导电性和信号转换.在含0.006 mol/L I-,pH4....
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| 关 键 词： | 多壁碳纳米管 离子液体 丝网印刷碳电极 茶叶 铅 |
Multi-walled Carbon Nanotubes-lonic Liquid Modified Screen-printed Carbon Electrodes for the Determination of Trace Lead in Tea |
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| XU Xu-ming,DOU Wen-chao,ZHAO Guang-ying.Multi-walled Carbon Nanotubes-lonic Liquid Modified Screen-printed Carbon Electrodes for the Determination of Trace Lead in Tea[J].Journal of Tea Science,2011,31(6):485-492. |
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| Authors: | XU Xu-ming DOU Wen-chao ZHAO Guang-ying |
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| Abstract: | A new,high sensitivity and selectivity electrochemical sensor for determination of trace lead in tea by differential pulse stripping voltammetry was investigated.For modification of the screen-printed carbon electrode,1-butyl-3-methylimidazolium hexafluorophosphate was applied as a super conductive binder and multi-walled carbon nanotubes were used after being functionalized.They improved the conductivity and signal transduction of electrode surface.In pH4.5 NaAc-HAc buffer containing 0.006 mol/L Iˉ,Pb2+ adsorbed onto the surface of MWCNTs-IL film coated SPCE at the deposition potential of-1.1 V.During the positive potential sweep,lead was oxidized,and a good stripping peak appeared at-0.30 V.Low concentration of Iˉ significantly enhanced the stripping peak current of lead.The liner relationship between stripping peak value and concentration of Pb2+ was in the range of 2～600 μg/L with the R value of 0.99926 and detection limit of 0.63 μg/L.No significant difference existed after the detection results were compared with ICP-MS method using t test.The high sensitivity and stability of this method demonstrated the application for a simple and economical determination of trace lead in tea. |
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| Keywords: | multi-walled carbon nanotubes ionic liquid screen-printed carbon electrode tea lead |
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