Institute for Environmental Studies, Faculty of Science, Charles University, Benátská 2, Prague 2, Czech Republic; Institute of Microbiology of the Czech Academy of Sciences, Vídeňská 1083, Prague 4, Czech Republic.
Institute for Environmental Studies, Faculty of Science, Charles University, Benátská 2, Prague 2, Czech Republic.
Sci Total Environ. 2021 May 20;770:145254. doi: 10.1016/j.scitotenv.2021.145254. Epub 2021 Jan 21.
The interaction of microplastics (MPs) and common environmental organic pollutants has been a frequently discussed topic in recent years. Although the estimated contamination caused by MPs in terrestrial ecosystems is one order of magnitude higher than that in the oceans, experiments have been conducted solely in an aqueous matrix. Therefore, an experiment was carried out with two soils differing in their concentrations of polycyclic aromatic hydrocarbons (PAHs) and polyurethane foams used for scent fences along roads and crop fields. Two types of polyurethane foam (biodegradable and conventional in aged and unaged form) were exposed to soils containing PAHs that originated from historically contaminated localities. The exposure lasted 28 days, and a newly developed three-step procedure to separate MPs from soil was then applied. Biodegradable polyurethane MPs exhibited a strong tendency to accumulate PAHs after 7 days, and their concentrations significantly grew over time. In contrast, the sorption of PAHs on conventional polyurethane MPs was substantially lower (a maximum of 3.6 times higher concentration than that in the soil). Neither type of foam changed their sorption behaviors after the aging procedure. The results indicate that the flexibility of the polyurethane polymeric network could be the main driving factor for the sorption.
近年来，微塑料（MPs）与常见环境有机污染物的相互作用一直是一个热门话题。尽管陆地生态系统中 MPs 造成的污染估计比海洋中高一个数量级，但实验仅在水基中进行。因此，进行了一项实验，使用两种土壤，其多环芳烃（PAHs）浓度不同，以及用于道路和农田气味围栏的聚氨酯泡沫。两种类型的聚氨酯泡沫（生物降解型和传统型，老化和未老化形式）暴露于源自历史污染地点的含 PAHs 的土壤中。暴露持续 28 天，然后应用新开发的三步程序从土壤中分离 MPs。生物降解型聚氨酯 MPs 在 7 天后表现出强烈的积累 PAHs 的趋势，其浓度随时间显著增长。相比之下，PAHs 在传统型聚氨酯 MPs 上的吸附要低得多（最大浓度比土壤高 3.6 倍）。两种泡沫在老化程序后都没有改变其吸附行为。结果表明，聚氨酯聚合物网络的柔韧性可能是吸附的主要驱动因素。
