Zhao Zixuan, Zhao Xuan, Shan Jiajia, Wang Xue
School of Ocean Science and Technology, Dalian University of Technology, Panjin 124221, China.
School of Ocean Science and Technology, Dalian University of Technology, Panjin 124221, China.
Sci Total Environ. 2024 Jan 10;907:168013. doi: 10.1016/j.scitotenv.2023.168013. Epub 2023 Oct 21.
Despite the threats posed by nanoplastics to the environment and human health, little was known about the occurrence, formation, migration, and environmental impacts of nanoplastics due to the lack of quantitative and sensitive detection techniques. In this work, an electrochemical strategy for the detection of nanoplastics based on Ag labeling was proposed. Positively charged silver ions were attached to negatively charged polystyrene nanoplastics (PSNPs), and then the silver ions on the surface of PSNPs were reduced to Ag by sodium borohydride. Subsequently, the concentration of PSNPs was determined by identifying the signal of Ag by differential pulse voltammetry. The method showed different sensitivity for PSNPs of different sizes (100, 367, 500 nm). For tap water samples, the reason for the change in Ag electrochemical signal was discussed. The sensitivity of the method to PSNPs in tap water was investigated. The feasibility of the method for environmental water samples was verified using spiked lake water and spiked seawater, and satisfactory recoveries (93-112 %) were obtained for PSNPs of different sizes and concentrations. This study provided a sensitive, low-cost, and simple method without complex instrumentation, which was important for the determination of PSNPs in environmental water samples.
尽管纳米塑料对环境和人类健康构成威胁，但由于缺乏定量和灵敏的检测技术，人们对纳米塑料的存在、形成、迁移及环境影响知之甚少。在这项工作中，提出了一种基于银标记检测纳米塑料的电化学策略。带正电荷的银离子附着在带负电荷的聚苯乙烯纳米塑料（PSNPs）上，然后用硼氢化钠将PSNPs表面的银离子还原为银。随后，通过差分脉冲伏安法识别银的信号来测定PSNPs的浓度。该方法对不同尺寸（100、367、500 nm）的PSNPs表现出不同的灵敏度。针对自来水样品，讨论了银电化学信号变化的原因。研究了该方法对自来水中PSNPs的灵敏度。使用加标湖水和加标海水验证了该方法对环境水样的可行性，不同尺寸和浓度的PSNPs获得了令人满意的回收率（93-112%）。本研究提供了一种无需复杂仪器的灵敏、低成本且简单的方法，这对于环境水样中PSNPs的测定具有重要意义。
