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基于铜纳米线修饰的玻碳电极对有机磷农药残留的电化学溶出伏安分析

Electrochemical Stripping voltammetric analysis of organophosphate pesticides based on Copper Nanowires modified electrode

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【作者】 包静侯长军李琼杨眉霍丹群

【Author】 Jing Bao;Changjun Hou;Qiong Li;Mei Yang;Danqun Huo;Key Laboratory of Biorheology Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University;

【机构】 重庆大学生物工程学院生物流变科学与技术教育部重点实验室

【摘要】 农药残留及其带来的食品、环境安全问题一直是社会广泛关注的热点。在这里,我们报告一个简单、快速、灵敏、选择性非酶电化学有机磷农药(OPs)传感器,由铜纳米线(CuNWs)修饰玻璃碳电极(GCE)表面,并采用溶出伏安法对其表面吸附的硝基芳香化合物进行快速、灵敏的分析检测(采用农药模型:甲基对硫磷)。通过循环伏安法(CV)、紫外光谱(UV)和方波伏安法(SWV)研究了该传感器对甲基对硫磷(MP)的相关电化学行为和作用机制。所制备的CuNWs可以大量的吸附硝基芳香化合物到所制备的传感器表面,对MP进行分析检测后发现MP发生电氧化还原反应后出现了一个不可逆的还原峰(Epc,-0.56 V)和一对可逆的氧化还原峰(Epa,-0.433 V,Epc,-0.332 V)。在优化的实验操作条件下,所制备的Nafion/CuNWs/GCE传感器成功实现了对甲基对硫磷(MP)从0.1ppm到5 ppm宽的动态范围检测,并得到了较高灵敏度(471.1μA·cm-2·ppb-1)和较低检测极限(LOD)(49.4 ppb)。此外,在干扰性实验结果表明,该传感器对类似含有硝基、苯环的常规化合物及其他常见杀虫剂、无机离子和糖等有较强的的抗干扰能力,并且进一步在实际大蒜液体样品的中进行检测也有可观的结果。因此,所制备的Nafion/CuNWs/GCE传感器将有利于探索金属纳米材料的应用非酶电化学传感器的开发,为类似于MP这样具有硝基和苯环的有机磷农药的检测提供了电化学传感器开发的理论依据和研究基础。

【Abstract】 We report a simple, rapid, sensitive and selective non-enzymatic electrochemical organophosphate pesticides(OPs) sensor, which is fabricated by copper nanowires(CuNWs) modified glassy carbon electrode.The prepared CuNWs can significantly promote the enrichment of nitroaromatic OPs onto the surface of the fabricated sensor and realizes their stripping voltammetric detection of nitroaromatic OPs(model: methyl parathion).The electrochemical properties of the as-prepared sensor for detecting MP were evaluated by cyclic voltammetric(CV) and square wave voltammetric(SWV).Under the optimized operational conditions, the as-prepared sensor for MP realized a good sensitivity of 471.1 μA·cm-2·ppb-1 within a highly linear range from 0.1 to 5 ppm and a low limit of detection(LOD) of 49.4 ppb.Moreover, interference from other common pesticides, inorganic ions and sugars was nearly negligible.Its further application for detection of MP in liquid garlic samples and acceptable stability were also demonstrated.Thus, the developed Nafion/CuNWs/GCE sensor would be beneficial to explore the application of metal nanomaterials in non-enzymatic electrochemical OPs sensors.

  • 【会议录名称】 第十三届全国电分析化学学术会议会议论文摘要集
  • 【会议名称】第十三届全国电分析化学学术会议
  • 【会议时间】2017-04-14
  • 【会议地点】中国江西南昌
  • 【分类号】O657.1;TQ450.263
  • 【主办单位】中国化学会、国家自然科学基金委、中国仪器仪表学会
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