An electrochemical sensor based on silver nanoparticles (AgNPs) was developed by immobilizing dissolved organic matter (DOM) to interact with AgNPs on a glassy carbon electrode (GC), forming a DOM/AgNP/GC composite. AgNPs have been fabricated and characterized using ultraviolet–visible spectroscopy, fluorescence spectroscopy, and transmission electron microscopy. The immobilization efficiency and stability of the DOM/AgNP/GC composite have been optimized through studying the effects of electrode material type, immobilization technique, sticking duration, supporting electrolyte, and pH using square wave anodic stripping voltammetry. The detection of atrazine (Atz), a common herbicide, in aqueous systems has a great significance because of its toxicity to humans and other animals. The DOM/AgNP/GC composite has been used for Atz assessment under the optimized conditions based on the aggregated and nonaggregated AgNPs. The sensor linear range is between 20 and 220 μg/L for both aggregated and nonaggregated AgNP-based sensors. Atz could also be detected on the basis of its electrochemical oxidation at DOM/AgNP/GC with a linear range of 10–140 μg/L. Both sensors have been employed for the assessment of Atz in natural water with acceptable recovery values.

中文翻译：

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水溶性有机物封端的银纳米颗粒在水体系中对r去津的电化学聚集传感

通过将溶解的有机物（DOM）固定在玻璃碳电极（GC）上与AgNPs相互作用，开发了一种基于银纳米颗粒（AgNPs）的电化学传感器，形成了DOM / AgNP / GC复合材料。已经使用紫外可见光谱，荧光光谱和透射电子显微镜对AgNPs进行了制备和表征。通过使用方波阳极溶出伏安法研究电极材料类型，固定技术，粘附时间，支持电解质和pH的影响，优化了DOM / AgNP / GC复合材料的固定效率和稳定性。在水系统中检测常见的除草剂at去津（Atz）具有重要意义，因为它对人类和其他动物具有毒性。DOM / AgNP / GC复合物已在基于聚集和非聚集AgNP的优化条件下用于Atz评估。对于基于聚集和非聚集的基于AgNP的传感器，传感器的线性范围在20到220μg/ L之间。还可以基于DOM / AgNP / GC上的电化学氧化检测到Atz，线性范围为10–140μg/ L。两种传感器均已被用于评估天然水中Atz的回收率值。