Doctoral Program in Sciences of Natural Resources, Universidad de La Frontera, Temuco, Chile.
Departamento de Ingeniería Química, Universidad de La Frontera, Temuco, Chile; Centro de Excelencia en Investigación Biotecnológica Aplicada al Medio Ambiente (CIBAMA), Temuco, Chile; Laboratorio de Nanobiotecnología Ambiental, Universidad de La Frontera, Temuco, Chile.
J Hazard Mater. 2019 Jan 5;361:228-236. doi: 10.1016/j.jhazmat.2018.08.042. Epub 2018 Aug 16.
Copper nanoparticles (NCu) have been proposed as an antimicrobial agent in agriculture. Therefore, NCu may interact with numerous pollutants including pesticides. Little is known about the combined effects of NCu and pesticides in soil. This study aimed at assessing the impact of NCu combined with the herbicide atrazine (ATZ) on soil. We focused on assessing the adsorption and dissipation of ATZ in the presence of NCu and the changes in microbial community profiles. First, ATZ adsorption isotherms (described using the Freundlich equation) were evaluated. After that, soil samples were spiked with NCu (40-60 nm) at 0.05 and 0.15% w/w and ATZ (3 mg a.i kg) and incubated for 30 days. The results showed that ATZ adsorption is favored by the presence of NCu. On the other hand, NCu at 0.15% w/w caused a significant decrease in ATZ dissipation, increasing its half-life from 6 to 37 days. Microbial community profiles (bacteria, fungi and nitrifying bacteria) remained relatively stable throughout the evaluated period. Therefore, our findings suggest that NCu can increase the persistence of ATZ in soil, which may be mostly associated to physical-chemical interaction with soil particles more than a microbial impact.
铜纳米颗粒（NCu）已被提议作为农业中的一种抗菌剂。因此，NCu 可能与包括农药在内的许多污染物相互作用。目前对于 NCu 和农药在土壤中的联合效应知之甚少。本研究旨在评估 NCu 与除草剂莠去津（ATZ）联合对土壤的影响。我们专注于评估在 NCu 存在的情况下 ATZ 的吸附和消解以及微生物群落特征的变化。首先，评估了 ATZ 的吸附等温线（用 Freundlich 方程描述）。之后，将土壤样品用 0.05% 和 0.15% w/w 的 NCu（40-60nm）和 3mg a.i kg 的 ATZ 进行接种，并在 30 天内进行培养。结果表明，NCu 的存在有利于 ATZ 的吸附。另一方面，0.15% w/w 的 NCu 导致 ATZ 消解显著减少，使其半衰期从 6 天增加到 37 天。在整个评估期间，微生物群落特征（细菌、真菌和硝化细菌）相对稳定。因此，我们的研究结果表明，NCu 可以增加 ATZ 在土壤中的持久性，这主要可能与 NCu 与土壤颗粒的物理化学相互作用有关，而不是与微生物的影响有关。
