University of Kentucky, Department of Plant and Soil Sciences, Lexington, KY 40546, United States; Center for the Environmental Implications of Nanotechnology, Duke University, Durham, NC 27708, United States.
Environ Pollut. 2013 Nov;182:141-9. doi: 10.1016/j.envpol.2013.06.027. Epub 2013 Jul 31.
This study addressed the relative importance of particle coating, sewage sludge amendment, and aging on aggregation and dissolution of manufactured Ag nanoparticles (Ag MNPs) in soil pore water. Ag MNPs with citrate (CIT) or polyvinylpyrrolidone (PVP) coatings were incubated with soil or municipal sewage sludge which was then amended to soil (1% or 3% sludge (w/w)). Pore waters were extracted after 1 week and 2 and 6 months and analyzed for chemical speciation, aggregation state and dissolution. Ag MNP coating had profound effects on aggregation state and partitioning to pore water in the absence of sewage sludge, but pre-incubation with sewage sludge negated these effects. This suggests that Ag MNP coating does not need to be taken into account to understand fate of AgMNPs applied to soil through biosolids amendment. Aging of soil also had profound effects that depended on Ag MNP coating and sludge amendment.
本研究探讨了在土壤孔隙水中，颗粒涂层、污水污泥添加物和老化对制造的银纳米颗粒（AgNPs）聚集和溶解的相对重要性。用柠檬酸（CIT）或聚乙烯吡咯烷酮（PVP）涂层包裹的 AgNPs 与土壤或城市污水污泥孵育，然后将污泥添加到土壤中（1%或 3%污泥（w/w））。孵育 1 周、2 个月和 6 个月后提取孔隙水，并分析其化学形态、聚集状态和溶解情况。在没有污水污泥的情况下，AgNPs 涂层对聚集状态和向孔隙水的分配有深远影响，但与污水污泥预先孵育则消除了这些影响。这表明，在通过生物固体添加来理解 AgNPs 在土壤中应用的命运时，不需要考虑 AgNPs 的涂层。土壤老化也有深远的影响，这取决于 AgNPs 涂层和污泥的添加。
