Abstract：
Silver nanoparticles (AgNPs) are among the most produced nanomaterials in the world and are incorporated into several products due to their biocide and physicochemical properties. Since freshwater bodies are AgNPs main final sink, several consequences for biota are expected to occur. With the hypothesis that AgNPs can interact with environmental factors, we analyzed their ecotoxicity in combination with humic acids and algae. In addition to the specific AgNPs behavior in the media, we analyzed the mortality, growth, and phototactic behavior of Chydorus eurynotus (Cladocera) as response variables. While algae promoted Ag+ release, humic acids reduced it by adsorption, and their combination resulted in an intermediated Ag+ release. AgNPs affected C. eurynotus survival and growth, but algae and humic acids reduced AgNPs lethality, especially when combined. The humic acids mitigated AgNP effects in C. eurynotus growth, and both factors improved its phototactic behavior. It is essential to deepen the study of the isolated and combined influences of environmental factors on the ecotoxicity of nanoparticles to achieve accurate predictions under realistic exposure scenarios.
摘要：
银纳米颗粒(AgNPs)是世界上生产最多的纳米材料之一,并且由于它们的杀生物剂和物理化学性质而被掺入到几种产品中。由于淡水水体是AgNPs的主要最终水槽，预计会对生物群产生若干后果。假设AgNPs可以与环境因素相互作用，我们结合腐殖酸和藻类分析了它们的生态毒性。除了媒体中特定的AgNPs行为之外，我们分析了死亡率，增长,和作为响应变量的Chydoruseurynotus（Cladocera）的趋光行为。虽然藻类促进Ag+释放，腐殖酸通过吸附还原它，它们的组合导致了中间的Ag释放。AgNPs影响C.eurynotus的存活和生长，但是藻类和腐殖酸降低了AgNPs的致死性,尤其是结合起来的时候。腐殖酸减轻了AgNP对C.eurynotus生长的影响，这两个因素都改善了它的趋光行为。必须深化环境因素对纳米粒子生态毒性的孤立和综合影响研究，以实现在现实暴露情景下的准确预测。
