Abstract A new voltammetric method was developed for the simple, rapid and inexpensive determination of 8-hydroxyquinoline (8HQ) on a modified electrode obtained by the electrodeposition of 1-amino-2-naphthol-4-sulfonic acid (ANSA) on the surface of a glassy carbon (GC) electrode. The electrode interfacial properties were investigated by electrochemical impedance spectroscopy (EIS). The electrochemical response of the ANSA-GC electrode toward 8-hydroxyquinoline was investigated by the use of square wave voltammetry. The ANSA-GC modified electrode showed two linear plots with 8-hydroxyquinoline concentrations from 5 × 10−7 to 1.4 × 10−5 mol dm−3 (R2 of 0.9984) and from 1.4 × 10−5 to 4.25 × 10−4 mol dm−3 with a correlation coefficient R2 equal to 0.9967. The limit of detection was 1.6 × 10−7 mol dm−3. The ANSA-GC modified electrode also showed excellent stability and reproducibility for up to two weeks. The analytical application of the ANSA-GC modified electrode was investigated for the determination of 8-hydroxyquinoline in a blush cosmetic product. The results in good agreement to those obtained by spectrophotometry as a standard method.

中文翻译：

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1-氨基-2-萘酚-4-磺酸修饰玻碳电极电化学测定化妆品中8-羟基喹啉

摘要 开发了一种新的伏安法，用于在修饰电极上简单、快速且廉价地测定 8-羟基喹啉 (8HQ)，该修饰电极是通过在电极表面电沉积 1-氨基-2-萘酚-4-磺酸 (ANSA) 获得的。玻碳 (GC) 电极。通过电化学阻抗谱（EIS）研究电极界面特性。通过使用方波伏安法研究了 ANSA-GC 电极对 8-羟基喹啉的电化学响应。ANSA-GC 修饰电极显示两个线性图，8-羟基喹啉浓度从 5 × 10-7 到 1.4 × 10-5 mol dm - 3（R2 为 0.9984）和从 1.4 × 10-5 到 4.25 × 10-4 mol dm - 3 的相关系数 R2 等于 0.9967。检测限为 1.6 × 10−7 mol dm − 3。ANSA-GC 修饰电极在长达两周的时间内也表现出出色的稳定性和重现性。研究了 ANSA-GC 修饰电极的分析应用，用于测定腮红化妆品中的 8-羟基喹啉。结果与通过分光光度法作为标准方法获得的结果非常吻合。