Assessing the interactions of metal nanoparticles in soil and sediment matrices – a quantitative analytical multi-technique approach†,Environmental Science: Nano

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Assessing the interactions of metal nanoparticles in soil and sediment matrices – a quantitative analytical multi-technique approach†
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2017-12-19 00:00:00 , DOI: 10.1039/c7en00868f
Hind El Hadri ₁ , Stacey M Louie ₁ , Vincent A Hackley ₁

Affiliation

The impact and behavior of engineered nanomaterials (ENMs) entering the environment is an important issue due to their growing use in consumer and agricultural products. Their mobility and fate in the environment are heavily impacted by their interactions with natural particle components of saturated sediments and soils. In this study, functionalized gold nanoparticles (AuNPs – used as model ENMs) were spiked into complex solid-containing media (standard soils and estuarine sediment in moderately hard water). AuNPs were characterized in the colloidal extract (<1 μm) following centrifugal separation of the non-colloidal phase, using different analytical techniques including asymmetric-flow field-flow fractionation and single particle inductively coupled plasma mass spectrometry. Attachment of functionalized AuNPs to the soil particles did not significantly depend on their concentration or surface coating (citrate, bPEI, PVP, PEG). Similarly, UV degradation of coatings did not substantially alter their recovery. Conversely, the presence of natural organic matter (NOM) is a key factor in their adhesion to matrix particles, by decreasing the predicted influence of native surface chemistry and functional coatings. A kinetic experiment performed over 48 h showed that attachment to soil colloids is rapid and that hetero-aggregation is dominant. These results suggest that transport of ENMs away from the point of discharge (or entry) could be limited in soils and sediments, but additional experiments under more realistic and dynamic field conditions would be necessary to confirm this more generally. Transport properties may also differ substantially in matrices where NOM is largely absent or otherwise sequestered or when dissolution of ENMs is an important factor.

中文翻译：

评估土壤和沉积物基质中金属纳米颗粒的相互作用——一种定量分析多技术方法†

由于工程纳米材料 (ENM) 在消费品和农产品中的使用不断增加，进入环境中的工程纳米材料 (ENM) 的影响和行为是一个重要问题。它们在环境中的流动性和命运受到它们与饱和沉积物和土壤的天然颗粒成分相互作用的严重影响。在这项研究中，功能化金纳米颗粒（AuNP – 用作模型 ENM）被掺入复杂的含固体介质（标准土壤和中等硬水中的河口沉积物）中。使用不同的分析技术，包括非对称流场流分级和单颗粒电感耦合等离子体质谱法，对非胶体相离心分离后的胶体提取物（<1 μm）中的金纳米粒子进行了表征。功能化金纳米颗粒与土壤颗粒的附着并不显着依赖于它们的浓度或表面涂层（柠檬酸盐、bPEI、PVP、PEG）。同样，涂层的紫外线降解并没有显着改变其恢复能力。相反，天然有机物（NOM）的存在是其粘附到基质颗粒的关键因素，可以减少天然表面化学和功能涂层的预期影响。超过 48 小时进行的动力学实验表明，其对土壤胶体的附着速度很快，并且异质聚集占主导地位。这些结果表明，ENM 远离排放点（或进入点）的运输在土壤和沉积物中可能受到限制，但需要在更现实和动态的现场条件下进行更多实验来更普遍地证实这一点。在 NOM 基本上不存在或以其他方式隔离的基质中，或者当 ENM 的溶解是一个重要因素时，传输特性也可能有很大差异。

更新日期：2017-12-19

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