基于石墨烯修饰的分子印迹膜丝网印刷电极快速测定烟草中苯霜灵农药残留
王春琼1,李籽萱2,李苓1,张燕1,彭丽娟1,陈丹1,曾彦波3
1.云南省烟草质量监督检测站,昆明 650106; 2.云南大学化学科学与工程学院,昆明 650091; 3.红云红河集团会泽卷烟厂,云南会泽 654200
Determination of benalaxyl in tobacco based on graphene modified molecular inprinting membrane screen printing electrode
王春琼1,李籽萱2,李苓1,张燕1,彭丽娟1,陈丹1,曾彦波3
1. Yunnan Tobacco Quality Supervision and Test Station, Kunming 650106, china; 2. School of Chemical Science and Technology, Yunnan University, Kunming 650091, China; 3. Huize Cigarette Factory of Hongyunhonghe Tobacco Group Co., Ltd., Huize 654200, China
摘要:建立了一种基于石墨烯修饰的分子印迹膜丝网印刷电极快速检测烟草样品中苯霜灵的电化学分析法。利用石墨烯的信号放大作用,结合分子印迹技术,以丙烯酰胺为功能单体,苯霜灵(Ben)为模板分子,在石墨烯修饰的丝网印刷电极表面,通过紫外引发聚合形成能识别苯霜灵分子的印迹敏感膜,采用循环伏安法、差分脉冲伏安法研究了印迹膜的结构、性能和分子印迹效应。该传感器对Ben的检测浓度范围为7.0×10-9~6.8×10-4 mol/L,Ben的检出限为2.1×10-9 mol/L,测定结果的相对标准偏差不大于3.21%(n=5),加标回收率为101.7%~110.4%。该方法可用于烟草中苯霜灵的测定。
Abstract:A screen printing electrode was fabricated for rapid determination of benalaxyl (Ben) in tobacco based on graphene modified molecular inprinting membrane screen printing electrode. The sensor was prepared by ultraviolet polymerization on the surface of graphene modified screen printing electrode with Ben as template. The structure, properties and molecular imprinting effect of the imprinted membrane were studied by CV and DPV. The sensor was used to determine benalaxyl whose linear range was 7.0×10-9-6.8×10-4 mol/L with the detection limit of 2.1×10-9 mol/L. The relative standard deviations of the detection data were not more than 3.21% (n=5), and the recoveries of benalaxyl were 101.7%-110.4%. The method can be applied to the determination of benalaxyl in different tobacco samples.
关键词:苯霜灵;丝网印刷电极;分子印迹膜;石墨烯;农药
Keywords:benalaxyl; screen printing electrode; molecularly imprinted membrane; graphene; pesticide
基金:云南省烟草专卖局科技资助项目(2017YN33)
本文引用格式:
王春琼,李籽萱,李苓,等.基于石墨烯修饰的分子印迹膜丝网印刷电极快速测定烟草中苯霜灵农药残留[J].化学分析计量,2019,28(1):43-47.
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