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-1) 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.

中文翻译：

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土壤中铜纳米颗粒和at去津的综合污染：对农药消散和微生物群落特征的影响。

铜纳米颗粒（NCu）已被提议作为农业中的抗菌剂。因此，NCu可能与包括农药在内的多种污染物发生相互作用。关于NCu和农药在土壤中的综合作用知之甚少。这项研究旨在评估NCu与除草剂at去津（ATZ）结合对土壤的影响。我们专注于评估存在NCu时ATZ的吸附和耗散以及微生物群落特征的变化。首先，评估了ATZ吸附等温线（使用Freundlich方程描述）。之后，将土壤样品掺入0.05％和0.15％w / w的NCu（40-60 nm）和ATZ（3 mg ai kg-1），孵育30天。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耗散显着降低，半衰期从6天增加到37天。在整个评估期间，微生物群落概况（细菌，真菌和硝化细菌）保持相对稳定。因此，我们的发现表明NCu可以增加ATZ在土壤中的持久性，这可能与微生物与土壤颗粒的物理化学相互作用有关，而与微生物的影响更大。