中文摘要：本文首次采用循环伏安法和方波伏安法通过由银纳米颗粒制备的固体银汞合金电极评价伏安行为并检测禾草敌除草剂。为了达到对禾草敌除草剂检测最大的分析响应，本文对实验和仪器参数进行了评估，发现当介质为PH值=4的0.04mol/L伯瑞坦-罗宾森缓冲溶液时，对禾草敌除草剂检测分析响应最大。在这些条件下，禾草敌除草剂检测在E-p=-0.37V时达到还原峰值，在9.36-243.49μg/L的浓度范围内建立了解析曲线，检测限为2.34μg/L，测量过程中汞齐电极表现出良好的稳定性，且具有2.9%的重复性和5.4%的再现性。本文所开发的伏安法可在低于欧洲联盟和巴西规定的标准下方便地检测河水和大米样本中禾草敌除草剂，且精准度较好（所有样品的相对标准差均小于5%）。与高效液相色谱法相比，结果较满意。根据本文研究结果，银纳米固体汞齐电极具有较高的灵敏度和对河水和大米样本中禾草敌除草剂常规监测的特异性，可作为常用还原性农药检测的替代方法。
外文摘要：The evaluation of the voltammetric behaviour and the determination of herbicide molinate were performed for the first time over the surface of solid amalgam electrode fabricated with silver nanoparticles using cyclic voltammetry and square-wave voltammetry techniques. The experimental and instrumental parameters were evaluated to reach the maximum analytical response for molinate. It was achieved when a medium composed of 0.04molL(-1) Britton-Robinson buffer at the pH value of 4.0 was used. Under these conditions, molinate showed one pronounced reduction peak at E-p=-0.37V (vs. Ag/AgCl 3molL(-1)) that was characterised as an irreversible system. An analytical curve was constructed at the concentration range from 9.36 to 243.49 mu gL(-1) and a limit of detection of 2.34 mu gL(-1) was obtained. The amalgam electrode presented good stability during the measurements with relative standard deviation (RSD) values of 2.9% for the repeatability and 5.4% for the reproducibility. The voltammetric method developed here could be conveniently applied for the determination of molinate in river water and rice spiked samples at levels below those established on the legislations of European Union and Brazil with good accuracy (RSD of less than 5% for all samples). Comparison with HPLC technique was carried out and the results indicated satisfactory concordance. According to the results depicted here, the silver nanoparticles solid amalgam electrode showed itself highly sensitive and an interesting alternative for the routine analysis of molinate in water and food samples. Furthermore, it introduces an environmentally acceptable alternative to the mercury electrodes, most commonly used for determination of reducible pesticides.
 
外文关键词：Environmental monitoring, foodomics, pesticide determination, square-wave voltammetry, solid electrode
作者：de Jesus, Vanessa Oliveira; Jacques Barbosa, Antonio Marcos; Petroni, Jacqueline Marques; Lucca, Bruno Gabriel; Ferreira, Valdir Souza
作者单位：Univ Fed Espirito Santo, Dept Ciencias Nat, Sao Mateus, Brazil.
期刊名称：INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
期刊影响因子：1.208
出版年份：2017
出版刊次：5
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