Abstract To precisely determine uranium in aqueous solution, we combined the synthesis of gold nanoparticles (AuNPs) with stripping voltammetry to develop a new electrochemical detection method with high sensitivity toward uranyl ions on account of its enrichment by deposition and determination by stripping. The uranyl was reduced and deposited on the surface of the electrode followed up with a stripping process catalyzed by AuNPs to determine the concentration of uranyl ions. The experimental parameters, such as pH, deposition potential and time were optimized. Under optimal conditions, the stripping voltammetry response of the modified electrode to uranyl shows a linear relationship with the concentration from 2.4 μg L−1 to 48 μg L−1 and 48 μg L−1 to 480 μg L−1, respectively. The AuNPs based electrode could be used to determine the concentration of uranyl ion in a few minutes with a detection limit of 0.3 μg L−1. The reproducibility and reliability of the electrode were also evaluated with good results. Finally, the proposed procedure was successfully applied to the determination of uranyl ions in natural water. This method is potentially applicable for the on-site environmental analysis.

中文翻译：

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基于金纳米粒子的电化学传感器用于灵敏检测天然水中的铀酰

摘要 为了精确测定水溶液中的铀，我们将金纳米粒子（AuNPs）的合成与溶出伏安法相结合，开发了一种新的电化学检测方法，对铀离子具有高灵敏度，因为它通过沉积富集和溶出测定。铀酰被还原并沉积在电极表面，随后进行由 AuNPs 催化的剥离过程，以确定铀酰离子的浓度。对pH、沉积电位和时间等实验参数进行了优化。在最佳条件下，修饰电极对铀酰的溶出伏安响应分别与 2.4 μg L-1 至 48 μg L-1 和 48 μg L-1 至 480 μg L-1 的浓度呈线性关系。基于 AuNPs 的电极可用于在几分钟内测定铀酰离子的浓度，检测限为 0.3 μg L-1。电极的再现性和可靠性也得到了很好的评价。最后，所提出的程序成功地应用于测定天然水中的铀酰离子。该方法可能适用于现场环境分析。