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Study of the electrochemical behavior and sensitive detection of pesticides using microelectrodes allied to square-wave voltammetry

机译：方波伏安法微电极研究农药的电化学行为和灵敏检测

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This work describes the application of gold and carbon fiber microelectrodes allied to square-wave voltammetry for the study of the electrochemical behavior of the organophosphorous insecticides (methyl parathion and dichlorvos) and bipyridilium herbicides (paraquat and diquat), and the development of the sensitive methodology for their analytical determinations in natural water samples. The microelectrodes were lab-made constructed and their electrochemical behavior was characterized by measuring the electrochemical response with a solution of potassium ferricyanide. The experimental and voltammetric conditions to obtain the best analytical signal, in terms of intensities and profile of the peak voltammetric, for four pesticides were optimized and the results were used to evaluate the type of the electrochemical redox process and to appraise the number of electrons covered in each reduction process that occurred for pesticides and also, to propose a possible redox mechanism for a reduction process of pesticides at microelectrodes. Analytical curves were constructed and presented the linear relationships between the peak currents and the concentration of pesticides, for this, the detection limits for pure water (laboratory samples) for four pesticides were calculated and presented values under 15 mu g L-1, lower than maximum limit for drinking water (100 mu g L-1) permitted by Brazilian Council for groundwater, indicating that the methodology could be employed to analyze those pesticides in natural water samples.
机译：这项工作描述了与方波伏安法相关的金和碳纤维微电极在研究有机磷杀虫剂（甲基对硫磷和敌敌畏）和联吡啶鎓除草剂（百草枯和敌草快）的电化学行为中的应用，以及灵敏方法的发展用于天然水样品中的分析测定。微电极是实验室制造的，其电化学行为通过用铁氰化钾溶液测量电化学响应来表征。在强度和峰伏安曲线方面，获得了最佳分析信号的实验和伏安条件，对四种农药进行了优化，并将结果用于评估电化学氧化还原过程的类型并评估了所覆盖的电子数在农药发生的每个还原过程中，还提出了一种可能的氧化还原机理，用于在微电极处还原农药。构造分析曲线并给出峰值电流与农药浓度之间的线性关系，为此，计算了四种农药的纯水（实验室样品）的检出限，并给出了在15μg L-1以下的值，低于巴西理事会对地下水的最大饮用水限量（100微克L-1），表明该方法可用于分析天然水样品中的那些农药。

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