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Microplastics and tyre wear particles infiltration in the soil of a roadside biofiltration swale
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Researchers investigated the infiltration of microplastics and tyre wear particles into soil along a roadside biofiltration swale, assessing the extent to which these particles migrate from the road surface into subsurface soils under real-world conditions.
International audience
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Stock and vertical distribution of microplastics and tire and road wear particles into the soils of a high-traffic roadside biofiltration swale
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Researchers quantified microplastics and tire and road wear particles in soil profiles of a highway-adjacent biofiltration swale in France, sampling at multiple depths. TRWP concentrations were highest near the road surface and declined with depth and distance, but particles were detected down to 30 cm, indicating that these roadside green infrastructure features accumulate and partially retain traffic-derived microplastics.
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Researchers investigated the role of bioswale green infrastructure in capturing tyre wear particle microplastics from road runoff, presenting data from bioswales constructed in 2010 and quantifying their effectiveness as sinks for tyre-derived microplastic pollution.
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Researchers assessed the impregnation levels and spatial gradient of tire and road wear particle (TRWP) contamination in surface soils adjacent to a major road, investigating how proximity to the road surface affects the degree of microplastic loading in roadside soil profiles. The results showed significant TRWP concentrations in soils closest to the road, with contamination gradients extending laterally into adjacent land, confirming roadside soils as durable repositories of tyre-derived microplastics.
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Researchers detected microplastics in soil samples collected from roadside areas, finding plastic particles at multiple locations and noting that road traffic generates microplastics through tire wear and pavement abrasion. Roads and their immediate surroundings are significant terrestrial sources and repositories of microplastics that can be transported by wind and runoff.
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Researchers examined the longitudinal and vertical distribution of tire wear particles (TWPs) within an urban bioswale — a type of sustainable urban drainage system — to assess how effectively this infrastructure captures and retains road runoff-derived microplastics. The study found that TWPs were distributed throughout the bioswale profile, demonstrating both retention capacity and potential for subsurface accumulation of these chemically complex road-derived microplastics.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.