微塑料
雨水
地表径流
环境科学
城市径流
碎片
水生生态系统
污染
海湾
水文学(农业)
环境化学
生态学
海洋学
地质学
生物
化学
岩土工程
作者
Larissa M. Werbowski,Alicia N. Gilbreath,Keenan Munno,Zhengui Xia,Jelena Grbić,Tina Wu,Rebecca Sutton,Margaret D. Sedlak,Ashok D. Deshpande,Chelsea M. Rochman
出处
期刊:ACS ES&T water
[American Chemical Society]
日期:2021-05-05
卷期号:1 (6): 1420-1428
被引量:115
标识
DOI:10.1021/acsestwater.1c00017
摘要
Stormwater runoff has been suggested to be a significant pathway of microplastics to aquatic habitats; yet, few studies have quantified microplastics in stormwater. Here, we quantify and characterize urban stormwater runoff from 12 watersheds surrounding San Francisco Bay for anthropogenic debris, including microplastics. Depth-integrated samples were collected during wet weather events. All stormwater runoff contained anthropogenic microparticles, including microplastics, with concentrations ranging from 1.1 to 24.6 particles/L. These concentrations are much higher than those in wastewater treatment plant effluent, suggesting urban stormwater runoff is a major source of anthropogenic debris, including microplastics, to aquatic habitats. Fibers and black rubbery fragments (potentially tire and road wear particles) were the most frequently occurring morphologies, comprising ∼85% of all particles across all samples. This suggests that mitigation strategies for stormwater should be prioritized. As a case study, we sampled stormwater from the inlet and outlet of a rain garden during three storm events to measure how effectively rain gardens capture microplastics and prevent it from contaminating aquatic ecosystems. We found that the rain garden successfully removed 96% of anthropogenic debris on average and 100% of black rubbery fragments, suggesting rain gardens should be further explored as a mitigation strategy for microplastic pollution.
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