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Polymer-specific transfer and retention of microplastics at the river–sediment–groundwater interface
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Researchers investigated how different polymer types of microplastics move through the sediment-water interface at bank filtration sites in northeastern Germany. They found that microplastic transport and retention varied significantly depending on the polymer type, with some plastics penetrating more readily into groundwater than others. The study provides evidence that river bank filtration does not fully prevent microplastic contamination of groundwater resources.
Microplastic particles (MPs) are ubiquitous across aquatic compartments, yet their transport and retention dynamics in surface water-groundwater systems remain poorly understood. This study investigates polymer-specific microplastic fate across the sediment-water interface at two bank filtration sites in northeastern Germany, both characterized by sandy riverbeds and permanently losing hydraulic conditions. Using harmonized sampling and analytical methods, MPs ≥32 µm were quantified in surface waters, sediment cores, and adjacent groundwater from October 2022 to March 2024. MP concentrations in surface waters were significantly reduced by over 84 % in adjacent groundwater, indicating high MP removal efficiency during bank filtration. Spatial heterogeneity in riverbed MP concentrations reflects hydraulic stress regimes, with ship-induced currents resuspending particles, preventing deposition in navigation canals, and enhancing accumulation in river banks. Non-metric multidimensional scaling confirmed significantly distinct polymer composition patterns across environmental compartments. While polyethylene and polypropylene dominated surface waters, negatively buoyant polymers such as polyethylene terephthalate and polyvinyl chloride were enriched in riverbeds and groundwater. Polyamide, although present in surface and groundwater samples, was absent from sediments, suggesting high subsurface mobility. Median MP sizes remained relatively constant across compartments, indicating that local hydrodynamics and polymer properties govern transport more than size alone. These findings emphasize the role of both removal along the subsurface flow path and lateral river hydrodynamics in MP distribution. Overall, this study provides robust field-based evidence of polymer-specific MP retention and transport at the surface water-groundwater interface, with implications for drinking water protection and freshwater ecosystem health.
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Researchers assessed microplastic occurrence and spatial distribution across surface water, riverbed sediments, and groundwater at two German lowland river sites -- the Teltow Canal and the Havel -- under bank filtration conditions, collecting monthly surface water and quarterly groundwater samples over one year alongside sediment freeze cores to 100 cm depth, analyzed by near-infrared spectroscopy.
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Researchers tested river water, groundwater and a drinking water well near Germany's Leine River to see how microplastics move through riverbank filtration, a natural water treatment method. River water had the most microplastics, mostly tiny fibers made of PET plastic, while the extraction well had far fewer, though small fibers could still pass through the filtering soil.
Polymer-specific transfer and retention of microplastics at the river–sediment–groundwater interface
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Scientists studied how tiny plastic particles move from rivers into underground water that could become drinking water. They found that different types of plastics behave differently - some float and stay in rivers, while heavier plastics like those from bottles and pipes sink into riverbeds and can travel into groundwater supplies. This research is important because it helps us understand how microplastics might contaminate the underground water sources we rely on for drinking water.
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Researchers studied how microplastics move through the hyporheic zone, the region where river water mixes with groundwater beneath the streambed. They found that denser plastic particles sank through sediment pores toward groundwater, while lighter plastics rose to the surface, and both behaved differently from dissolved substances. These findings raise concerns that microplastics may be contaminating groundwater systems through processes that are not well captured by current water quality models.
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