A RAPID ELECTROCHEMICAL MONITORING PLATFORM FOR SENSITIVE DETERMINATION OF THIAMETHOXAM BASED ON beta-CYCLODEXTRIN-GRAPHENE COMPOSITE

文献类型： 外文期刊

第一作者： Zhai, Xingchen

作者： Zhai, Xingchen;Yang, Xin;Wang, Jing;Zhai, Xingchen;Zhang, Hua;Zhang, Min;Yang, Xin;Gu, Cheng;Zhao, Haitian;Wang, Zhenyu;Dong, Aijun;Wang, Jing;Zhou, Guopeng

作者机构：

关键词： Thiamethoxam;Electrochemical sensor;beta-cyclodextrin-graphene composite;Brown rice;Determination

期刊名称：ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY （ 影响因子：3.742； 五年影响因子：3.866 ）

ISSN： 0730-7268

年卷期： 2017 年 36 卷 8 期

页码：

收录情况： SCI

摘要： A rapid monitoring platform for sensitive voltammetric detection of thiamethoxam residues is reported in the present study. A beta-cyclodextrin-reduced graphene oxide composite was used as a reinforcing material in electrochemical determination of thiamethoxam. Compared with bare glassy carbon electrodes, the reduction peak currents of thiamethoxam at reduced graphene oxide/glassy carbon electrode and beta-cyclodextrin-reduced graphene oxide/glassy carbon electrode were increased by 70- and 124-fold, respectively. The experimental conditions influencing voltammetric determination of thiamethoxam, such as the amount of beta-cyclodextrin-reduced graphene oxide, solution pH, temperature, and accumulation time, were optimized. The reduction mechanism and binding affinity of this material is also discussed. Under optimal conditions, the reduction peak currents increased linearly between 0.5 mu M and 16 mu M concentration of thiamethoxam. The limit of detection was 0.27 mu M on the basis of a signal-to-noise ratio of 3. When the proposed method was applied to brown rice in a recovery test, the recoveries were between 92.20% and 113.75%. The results were in good concordance with the high-performance liquid chromatography method. The proposed method therefore provides a promising and effective platform for sensitive and rapid determination of thiamethoxam. (C) 2017 SETAC

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