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Novel electrochemical procedure for the determination of metamitron

机译：电化学测定米托米通的新方法

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In this paper, a chronopotentiometric method for the determination of herbicide metamitron (MTM) using a glassy carbon electrode (GCE) and a thin film mercury electrode (TFME) as working electrodes is presented. MTM provided a well-defined reductive peak in the Britton-Robinson buffer on both working electrodes. Instrumental and chemical factors such as pH of the buffer, initial potential and reduction current influencing MTM chronopotentiometric response were optimised with the Box-Behnken experimental design. Under the optimal combination of factors, the analytical signal was linear in the MTM concentration range of 0.8-30mg/L, with a detection limit of 68.53 mu g/L using a TFME, and in the concentration range of 1-30mg/L, with a detection limit of 92.91 mu g/L using a GCE. The precision of the method was estimated as a function of repeatability and reproducibility, with the value of relative standard deviation lower than 2.6%. The applicability of the method was verified by direct analysis of MTM in spiked water samples and commercial pesticide formulations. The obtained results were in good agreement with those obtained using liquid chromatography/tandem mass spectrometry (LC-MS/MS) method, or with those labelled by the manufacturer. By using chronopotentiometry, neither extraction nor preconcentration procedures are necessary, thus making this method simple, cost-effective and more feasible for analytical routine analysis.
机译：本文提出了一种计时电位法，使用玻璃碳电极（GCE）和薄膜汞电极（TFME）作为工作电极测定除草剂metmitron（MTM）。 MTM在两个工作电极上的Britton-Robinson缓冲液中均提供了明确定义的还原峰。通过Box-Behnken实验设计优化了仪器和化学因素，例如缓冲液的pH值，影响MTM计时电位响应的初始电势和还原电流。在最佳因素组合下，分析信号在MTM浓度范围为0.8-30mg / L，使用TFME的检测限为68.53μg / L和浓度范围为1-30mg / L时呈线性，使用GCE的检测限为92.91μg / L。估计方法的精确度是重复性和重现性的函数，相对标准偏差的值低于2.6％。通过直接分析加标水样品和商业农药制剂中的MTM，验证了该方法的适用性。所得结果与使用液相色谱/串联质谱法（LC-MS / MS）或制造商标记的结果高度吻合。通过使用计时电位法，不需要提取或预浓缩程序，因此使该方法简单，经济高效，并且对于分析常规分析更可行。

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