Seasonal Differences and Grazing Pressure Alter the Fate of Gold Nanoparticles in a Microcosm Experiment,Environmental Science & Technology

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Seasonal Differences and Grazing Pressure Alter the Fate of Gold Nanoparticles in a Microcosm Experiment
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2023-09-05 , DOI: 10.1021/acs.est.3c01839
Christina M Bergemann _{1,

2,

3} , Astrid Avellan _{1,

4,

5} , Brittany G Perrotta _{1,

6,

7} , Emily S Bernhardt _{1,

2} , Marie Simonin _{1,

2,

8}

Affiliation

Gold nanoparticles (AuNPs) are used as models to track and predict NP fates and effects in ecosystems. Previous work found that aquatic macrophytes and their associated biofilm primarily drove the fate of AuNPs within aquatic ecosystems and that seasonality was an important abiotic factor in the fate of AuNPs. Therefore, the present work aims to study if grazers, by feeding on these interfaces, modify the AuNP fate and if this is altered by seasonal fluctuations. Microcosms were dosed with 44.8 μg/L of AuNP weekly for 4 weeks and maintained in environmental chambers simulating Spring and Fall light and temperature conditions. We discovered that seasonal changes and the presence of grazers significantly altered the fate of Au. Higher temperatures in the warmer season increased dissolved organic carbon (DOC) content in the water column, leading to stabilization of Au in the water column. Additionally, snail grazing on biofilm growing on the Egeria densa surface led to a transfer of Au from macrophytes to the organic matter above the sediments. These results demonstrate that climate and grazers significantly impacted the fate of Au from AuNPs, highlighting the role that grazers might have in a large and biologically more complex ecosystem.

中文翻译：

季节差异和放牧压力改变微观实验中金纳米颗粒的命运

金纳米粒子（AuNP）被用作模型来跟踪和预测纳米粒子在生态系统中的命运和影响。先前的研究发现，水生大型植物及其相关生物膜主要驱动水生生态系统中金纳米粒子的命运，而季节性是金纳米粒子命运的重要非生物因素。因此，目前的工作旨在研究食草动物是否通过以这些界面为食来改变 AuNP 的命运，以及这是否会因季节波动而改变。每周向微观世界施用 44.8 μg/L AuNP，持续 4 周，并维持在模拟春季和秋季光照和温度条件的环境室中。我们发现季节变化和食草动物的存在显着改变了金的命运。温暖季节的较高温度增加了水体中溶解有机碳 (DOC) 的含量，从而导致水体中金的稳定。此外，蜗牛在致密细叶藻表面生长的生物膜上吃草导致金从大型植物转移到沉积物上方的有机物中。这些结果表明，气候和食草动物显着影响了金纳米粒子中金的命运，突显了食草动物在大型且生物学上更复杂的生态系统中可能发挥的作用。

更新日期：2023-09-05

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