In this study, electrochemically reduced graphene oxide (ERGO) was used for the preparation of a screen‐printed modified electrode and applied for the voltammetric determination of fenamiphos (FNP) in tomato samples. Graphene oxide (GO) used for sensor construction was prepared according to an improved Hummers method and characterized by XRD, TEM, and FTIR, which confirmed the nanomaterial obtention. The ERGO formation was carried out from the electrodeposition by cyclic voltammetry, at 50 mV s⁻¹ in the potential range of 0.0 to −1.5 V, during 50 cycles. ERGO‐SPE was used in the evaluation of the voltammetric behavior of FNP. The ERGO‐SPE proposed presented excellent electrochemical performance towards FNP oxidation, promoting an enhance on the anodic peak current and a decrease of peak potential. Under optimized conditions, it was possible to construct an analytical curve, using square wave voltammetry, with a linear region of 0.25 to 25.0 μM, with calculated limits of detection and quantification of 0.067 and 0.22 μM. From this, it was possible to analyze FNP in fortified tomato samples at three concentration levels, which showed recoveries values varying between 82 and 102 %. The ERGO‐SPE device proved useful in determining FNP, where the effect of the electrodeposition of the GO promoted a significant increase in the employability of the printed electrode.

中文翻译：

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电化学还原的氧化石墨烯作为丝网印刷电极改性剂，用于苯那磷的测定

在这项研究中，电化学还原氧化石墨烯（ERGO）用于制备丝网印刷的修饰电极，并用于伏安法测定番茄样品中的苯甲磷（FNP）。根据改进的Hummers方法制备用于传感器构造的氧化石墨烯（GO），并通过XRD，TEM和FTIR对其进行表征，证实了纳米材料的存在。由电沉积通过循环伏安法在50 mV s ^-1下进行ERGO的形成在50个周期内的电压范围为0.0至-1.5V。ERGO-SPE用于评估FNP的伏安行为。提出的ERGO-SPE对FNP氧化具有优异的电化学性能，促进了阳极峰值电流的增强和峰值电位的降低。在优化的条件下，可以使用方波伏安法绘制线性范围为0.25至25.0μM，计算的检出限和定量限为0.067和0.22μM的分析曲线。据此，可以分析三种浓度水平的强化番茄样品中的FNP，其回收率介于82％和102％之间。事实证明，ERGO-SPE设备可用于确定FNP，