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Abundance,spatial distribution,and physical characteristics of microplastics in stormwater detention ponds

Frontiers of Environmental Science & Engineering 2023年第10期17卷 75-87页

作者： Muhammad Masood Ashiq farhad jazaei Kati Bell Ahmed Shakir Ali Ali Alireza Bakhshaee Peyman Babakhani Department of Civil Engineering University of MemphisMemphisTN 38152USA Brown and Caldwell NashvilleTN 37228USA Earth Surface Science Institute School of Earth and EnvironmentUniversity of LeedsLeedsLS29JTUK

Despite extensive research on microplastics (MP) in marine environments, little is known about MP abundance and transport in terrestrial systems. There is, therefore, still little understanding of the main mechanisms driving the substantial transport of MP across different environmental compartments. Storm events can transport MP beyond boundaries, such as from the land to groundwater or the ocean, as has already been discovered for organic carbon transport. Urban stormwater detention ponds are suitable environments to study the impact of stormwater on the environmental fate and transport of MP. Herein, we investigate the longitudinal and vertical distribution of MP within two detention ponds with different physical characteristics. Soil samples were collected at various locations and from multiple depths (surface and subsurface layers) for measuring MP concentrations using fluorescence microscopy. Our findings show that MP are retained more near the inlet of the ponds, and MP of larger sizes were found more abundantly near inlets than outlets. We also found that MP mass and sizes decrease from surface soil to subsurface soil. In the pond, where vegetation (grass root network) was more considerable, MP were found more evenly distributed along the depth. In terms of shape, the fragments were the most abundant MP shape.

关键词： Microplastic Environmental transport Soil pollution Stormwater Detention ponds

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