Abstract Simultaneous detection of ammonia and nitrate has significance in the application areas of environment and industry. Conventional methods include additional steps to separate ammonia and nitrate before detection. A more convenient method is required to detect ammonia and nitrate directly in their mixture. In this work, a modified electrode with electrodeposited Pt region and Ag region was prepared to simultaneously detect ammonia and nitrate for the first time. The Pt region and Ag region were designed to selectively determine ammonia and nitrate, respectively, free of interference with each other. A nonlinear correlation between ammonia oxidation current and ammonia bulk concentration and a linear correlation between nitrate reduction current and nitrate bulk concentration were found. The simultaneous detection limits of ammonia and nitrate were 3.946 μM and 0.134 mM, respectively. The modified electrode showed good long-term stability for the simultaneous detection of ammonia and nitrate with relative standard deviations of 7.10% and 3.93%, respectively. The modified electrode exhibited good anti-interference ability toward Na+, K+, Cl− and SO42−. This work demonstrated a simple and fast approach for detecting two components in solution.

中文翻译：

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使用具有两个区域的改进电极同时检测氨和硝酸盐

摘要 氨和硝酸盐的同时检测在环境和工业应用领域具有重要意义。常规方法包括在检测前分离氨和硝酸盐的额外步骤。需要一种更方便的方法来直接检测混合物中的氨和硝酸盐。在这项工作中，首次制备了具有电沉积 Pt 区域和 Ag 区域的修饰电极以同时检测氨和硝酸盐。Pt 区域和 Ag 区域分别用于选择性测定氨和硝酸盐，互不干扰。发现了氨氧化电流和氨体积浓度之间的非线性相关性以及硝酸盐还原电流和硝酸盐体积浓度之间的线性相关性。氨和硝酸盐的同时检测限分别为 3.946 μM 和 0.134 mM。修饰电极在同时检测氨和硝酸盐方面表现出良好的长期稳定性，相对标准偏差分别为 7.10% 和 3.93%。修饰电极对Na+、K+、Cl-和SO42-表现出良好的抗干扰能力。这项工作展示了一种简单快速的方法来检测溶液中的两个成分。