This study reports the electrochemical monitoring and sensing of diphenylamine (DPA), an anti-scald agent on a modified pencil graphite electrode (PGE). DPA is also a potentially toxic environmental pollutant. A polymer of tyrosine synthesized by electrochemical process was utilized for the determination of DPA in real samples. The electrodes were characterized using IR, SEM, EDAX, AFM and EIS analyses. As far as we know, this is first time reporting the utilization of modified PGE via green approach for the monitoring of DPA. A dynamic linear range of 1.00-117.11 µM with a lower detection limit (LOD) of 0.7050 µM was showed by this sensor for the electrochemical quantification of DPA. The electrochemical oxidation of DPA on the modified sensor followed a mixed adsorption -diffusion controlled kinetics. The sensor also showed good anti-interference property for the determination of DPA in real samples. Furthermore, the developed sensor was applied for the selective sensing of DPA from real apple extracts with good recovery. The real sample analysis was validated with standard spectrophotometric method.

中文翻译：

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使用改良铅笔石墨电极测定二苯胺的一次性伏安传感器。

本研究报告了二苯胺 (DPA)（一种改性铅笔石墨电极 (PGE) 上的防烫剂）的电化学监测和传感。DPA 也是一种潜在的有毒环境污染物。采用电化学法合成的酪氨酸聚合物用于实际样品中 DPA 的测定。使用 IR、SEM、EDAX、AFM 和 EIS 分析对电极进行表征。据我们所知，这是首次报道通过绿色方法利用改性PGE来监测DPA。该传感器对 DPA 进行电化学定量，显示动态线性范围为 1.00-117.11 µM，检测下限 (LOD) 为 0.7050 µM。DPA 在改进的传感器上的电化学氧化遵循混合吸附-扩散控制动力学。该传感器在实际样品中DPA的测定中也表现出良好的抗干扰性能。此外，所开发的传感器用于从真正的苹果提取物中选择性检测 DPA，回收率良好。使用标准分光光度法验证了实际样品分析。