银纳米粒子在天然水生有机物存在下的溶解和命运

C. Watanabe, R. F. Domingos, M. Benedetti, A. H. Rosa
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引用次数: 0

摘要

尽管人们对纳米颗粒(NP)的兴趣和使用日益增加,但由于大多数相关研究没有考虑到天然涂层对NP的影响,因此对使用NP的环境后果知之甚少。本研究的目的是提高我们对NP在水生系统中的命运的认识。研究了在天然水体中与环境相关的组分(腐殖质和细胞外聚合物)存在的情况下,柠檬酸盐和聚乙二醇覆盖的银NP (AgNP)分散在生态毒理学基质中的命运。AgNP与天然有机物之间的相互作用通过超离心和电泳迁移率测量来评估AgNP的溶解。腐殖质和胞外聚合物质均降低了溶出速率。天然有机物(腐殖质和细胞外聚合物质)为培养基稳定NP提供了条件。溶解速率取决于涂层类型(柠檬酸盐或聚乙二醇)、溶解有机碳浓度和颗粒浓度。藻类和水蚤的存在影响了AgNP的转化,证明了考虑环境相关基质的研究价值。该结果提高了我们对影响AgNP生物利用度的因素的理解,从而提高了我们评估AgNP毒性的能力。使用相同策略的其他NP研究将提高我们对纳米材料在环境和生物群中的命运的理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dissolution and fate of silver nanoparticles in the presence of natural aquatic organic matter
Despite increasing interest in and use of nanoparticles (NP), the environmental consequences of using NP are poorly understood because most relevant studies have not taken the effects of natural coatings on NP into consideration. The aim of this study was to improve our understanding of the fates of NP in aquatic systems. The fates of silver NP (AgNP) capped with citrate and polyethylene glycol dispersed in ecotoxicological matrices in the presence of environmentally relevant components of natural water (humic substances and extracellular polymeric substances) were investigated. Interactions between AgNP and natural organic matter were evaluated by ultracentrifugation and electrophoretic mobility measurements to assess AgNP dissolution. Humic substances and extracellular polymeric substances both decreased the dissolution rate. The natural organic matter (humic substances and extracellular polymeric substances) provided conditions in which the medium stabilized the NP. The dissolution rate depended on the coating type (citrate or polyethylene glycol), dissolved organic carbon concentration, and particle concentration. The presence of algae and Daphnia affected AgNP conversion, demonstrating the value of research that takes environmentally relevant matrices into consideration. The results improve our understanding of the factors that affect the bioavailabilities of AgNP and therefore improve our ability to evaluate AgNP toxicity. Studies of other NP using the same strategy will improve our understanding of the fates of nanomaterials in the environment and biota.
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CiteScore
1.70
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