Abstract

A method is developed for immobilizing a binary gold–palladium (Au–Pd) system on the surface of a glassy carbon (GC) electrode coated with reduced graphene oxide (rGO). Using rGO as a matrix for the inclusion of the Au–Pd binary system significantly enhanced its catalytic activity for the electrooxidation of tetracycline. This improvement is attributed to an increased dispersity of the deposit and the formation of metal nanoparticles in the nanometer range, with an average particle size of 50 nm. The optimal conditions for immobilizing the Au–Pd binary system were identified to maximize the electrocatalytic effect. The feasibility of the amperometric detection of tetracycline on the GC electrode modified with the Au–Pd and rGO composite was demonstrated under flow-injection analysis conditions. The proposed method exhibits high sensitivity (with a detection limit of 5 nM), rapidity, and high throughput (60 samples/h). The developed flow-injection amperometric method for tetracycline determination was successfully applied to analyze flower honey samples from different regions of the Volga area.

中文翻译：

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使用经金、钯和还原氧化石墨烯改性的电极对蜂蜜中的四环素进行流动式安培检测

 抽象

开发了一种将二元金-钯 （Au-Pd） 系统固定在涂有还原氧化石墨烯 （rGO） 的玻碳 （GC） 电极表面的方法。使用 rGO 作为包含 Au-Pd 二元系统的基质显着增强了其对四环素电氧化的催化活性。这种改进归因于沉积物分散性的增加和纳米范围内金属纳米颗粒的形成，平均粒径为 50 nm。确定了固定 Au-Pd 二元系统的最佳条件，以最大限度地提高电催化效果。在流式注射分析条件下，证明了在用 Au-Pd 和 rGO 复合材料修饰的 GC 电极上对四环素进行安培检测的可行性。所提出的方法具有高灵敏度（检测限为 5 nM）、快速和高通量（60 个样品/小时）。开发的用于四环素测定的流动注射安培法已成功应用于分析来自伏尔加河地区不同地区的花蜜样品。