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Sediment trapping: a method for monitoring microplastic litter influx in aquatic sediments
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Researchers reviewed how microplastics accumulate in aquatic sediments — particularly the ocean floor — finding that sediments act as a long-term sink where plastics alter microbial communities and harm bottom-dwelling organisms, meaning the ecological damage of plastic pollution extends far beyond what is visible at the water surface.
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This review synthesizes research on the sources and ecological effects of microplastics in sediments, tracing transport pathways from terrestrial runoff through freshwater systems to marine sediment sinks and documenting impacts on benthic organisms and ecosystem function. Sediments serve as long-term reservoirs of microplastic pollution, making sediment ecology a critical lens for understanding cumulative environmental burden and food chain exposure risks posed by plastic debris.
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This global review of freshwater sediment studies finds that human activities, stormwater runoff, water flow, and sediment grain size all shape where microplastics accumulate in rivers and lakes, but most data come from Asia with limited coverage elsewhere. Filling these geographic and temporal gaps is essential for understanding the long-term fate of microplastics in freshwater systems that supply drinking water worldwide.
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A low-cost sediment trap deployed in fluvial systems captured approximately 25% of introduced microplastics across varied particle types and flow rates, with capture efficiency varying significantly by particle size and shape. The results provide a baseline for designing affordable, scalable tools to monitor and potentially remediate microplastic pollution in rivers and creeks.
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