Abstract An electrochemical sensor based on Nafion-multi-walled carbon nanotubes aerogel/gold nanoparticles modified graphene screen-printed electrode (Gr-SPE) for simultaneous electrochemical measurement of hydroquinone (HQ), catechol (CC) and resorcinol (RC) in citrate/phosphate buffer solution (CPBS, pH = 6.0) was introduced. The dihydroxybenzene (DHB) isomers could well separate from each other at the scan rate of 50 mV/s and the separations of the oxidation peak potentials of HQ-CC and for CC-RC were over more than 110 mV and 381 mV, respectively. Square wave voltammetry (SWV) was employed for the measurement of three DHB isomers in their ternary mixture. The linear response for HQ, CC and RC were 0.2-75 μM, 0.2–50 μM and 0.2–125 μM, respectively. The calculated detection limits were 0.014 μM, 0.017 μM and 0.05 μM (S/N = 3), respectively. The as-prepared sensing platform was applied to detect DHB isomers in real water samples (tap water, mineral water). The calculated recoveries were 96–100% for HQ, 95–100% for CC and 95–99% for RC, respectively.

中文翻译：

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多壁碳纳米管气凝胶/金纳米粒子改性石墨烯丝网印刷电极同时电化学传感二羟基苯异构体

摘要 一种基于 Nafion-多壁碳纳米管气凝胶/金纳米颗粒修饰的石墨烯丝网印刷电极 (Gr-SPE) 的电化学传感器，用于同时电化学测量柠檬酸盐中的氢醌 (HQ)、邻苯二酚 (CC) 和间苯二酚 (RC)。引入磷酸盐缓冲溶液（CPBS，pH = 6.0）。二羟基苯 (DHB) 异构体在 50 mV/s 的扫描速率下可以很好地相互分离，HQ-CC 和 CC-RC 的氧化峰电位的分离分别超过 110 mV 和 381 mV。方波伏安法 (SWV) 用于测量三元混合物中的三种 DHB 异构体。HQ、CC 和 RC 的线性响应分别为 0.2-75 μM、0.2-50 μM 和 0.2-125 μM。计算出的检测限分别为 0.014 μM、0.017 μM 和 0.05 μM (S/N = 3)。所制备的传感平台用于检测实际水样（自来水、矿泉水）中的 DHB 异构体。HQ 的计算回收率分别为 96-100%、CC 的 95-100% 和 RC 的 95-99%。