Abstract This study describes the development of a simple and accurate methodology for carbamate pesticide formetanate (FMT) analysis in fruits based on the use of a boron-diamond doped electrode (BDDE) cathodically pretreated and on the forward component of the current of square-wave voltammetry (SWV). FMT exhibits a well-defined irreversible oxidation process, which reaction mechanism is diffusion-controlled, involves the participation of one electron and is influenced by the electrolyte pH. However, protonation does not participate in the rate-determining step in the redox process. The optimum experimental and voltammetric conditions were pH 7.0 (0.04 mol L−1 Britton-Robinson buffer), pulse potential frequency of 20 s−1, amplitude of the pulse of 25 mV, and height of the potential step of 3 mV. Under the optimum conditions, calibration curve was linear from 4.98 × 10−7 to 1.70 × 10−5 mol L−1 FMT with a limit of detection of 3.7 × 10−7 mol L−1. FMT sensing was performed in different fruits (mango and grape). Recoveries ranged from 95.2 ± 2.8 to 104.0 ± 3.5% for mango and 96.5 ± 2.5 to 105.2 ± 3.5% for grape proving the accuracy and precision of the electroanalytical methodology. The attained data validated the applicability of the developed approach for FMT quantification in fruits.

中文翻译：

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掺硼金刚石电极检测水果中甲酸农药

摘要 本研究描述了基于使用阴极预处理的硼-金刚石掺杂电极 (BDDE) 和方波电流的正向分量对水果中氨基甲酸酯农药甲酸酯 (FMT) 分析的简单而准确的方法的开发。伏安法 (SWV)。FMT 表现出明确定义的不可逆氧化过程，其反应机制受扩散控制，涉及一个电子的参与，并受电解质 pH 值的影响。然而，质子化不参与氧化还原过程中的速率决定步骤。最佳实验和伏安条件为 pH 7.0（0.04 mol L-1 Britton-Robinson 缓冲液），脉冲电位频率为 20 s-1，脉冲幅度为 25 mV，电位阶跃高度为 3 mV。在最佳条件下，校准曲线从 4.98 × 10-7 到 1.70 × 10-5 mol L-1 FMT 呈线性，检测限为 3.7 × 10-7 mol L-1。FMT 传感在不同的水果（芒果和葡萄）中进行。芒果的回收率为 95.2 ± 2.8 至 104.0 ± 3.5%，葡萄的回收率为 96.5 ± 2.5 至 105.2 ± 3.5%，证明了电分析方法的准确性和精密度。获得的数据验证了所开发的水果 FMT 定量方法的适用性。