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Vertical transport of HDPE microplastics through sandy and silty soil
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Researchers ran lab experiments to measure how fast microplastics made of high-density polyethylene (HDPE) move downward through sandy and silty soils, finding that faster water flow pushed particles deeper. Under realistic field conditions, they estimated it could take 144 years for microplastics to reach groundwater through sandy soil and 356 years through silty soil — but that groundwater contamination is still a real long-term risk.
Microplastic pollution is an emerging concern and poses a potential risk to soil ecosystems and subsequently can lead to groundwater contamination. The sandy and silty soils are the major soil types covering more than 31 % of the land area globally. The vertical transport of microplastic in sandy and silty soil and further possible groundwater contamination is still unclear and not fully understood in the literature. The present study focuses on the movement of High-Density Polyethylene (HDPE) microplastics in quartz sand and silty soil using column experiments. Detailed flow through laboratory experiments are performed to understand the effect of varying the critical parameters in contaminant transport such as pore volumes (1PV,2PV,3PV,4PV,5PV,6PV,7PV,8PV,9PV,10PV) and flow rates (20,40,60,80,100,120 ml/min) on HDPE microplastic movement in sandy and silty soil separately. The maximum depth of microplastic transport in sandy soil was 20-22 cm for a flow rate of 120 ml/min, and 10-12 cm for 20 ml/min. In silty soil, the maximum depth of microplastic transport was 12-14 cm for 120 ml/min and 6-8 cm for 20 ml/min. The study also estimates the number of years required for microplastic contamination to reach groundwater under field conditions by considering the L/S ratio. The study estimated that it could take 144 years for microplastics to penetrate sandy soil and 356 years for silty soil, under the study conditions. The study highlights the significant threat posed by microplastics to groundwater contamination. The results suggest that soils may serve as both a sink for microplastics and a potential pathway for their entry into subsurface environments, such as underground habitats and water sources.
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Polyethylene and polypropylene microplastics of varying sizes were tracked through sand soil columns under repeated wet-dry cycles, finding that the smallest particles (21 μm PE) migrated deepest and that migration depth increased linearly with the number of wet-dry cycles. The study reveals that small microplastics can penetrate much deeper into soil profiles than larger particles, raising concern about groundwater contamination.
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Researchers investigated how microplastics move downward through soil using laboratory column experiments and field sampling of groundwater. They found that heavier rainfall, smaller particle size, and fiber-shaped microplastics all increased vertical transport through unsaturated soil. Field samples confirmed the presence of microplastics in both soil layers and groundwater, suggesting that surface plastic pollution can migrate into underground water supplies.
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Researchers studied how microplastics move vertically through sandy soil during cycles of wetting and drying, testing four common plastic types at various particle sizes. They found that smaller, more hydrophobic particles migrated deeper, and that frequent wet-dry cycles and the presence of dissolved organic matter accelerated downward movement. The findings suggest that microplastics in agricultural soils could potentially reach groundwater, posing risks to underground water quality.
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Scientists studying how tiny plastic particles move through soil found that older prediction models may have gotten it wrong—actual plastic pollution moves faster through unsaturated soil (the layer above groundwater) than previously thought, but ends up trapped in deeper saturated soil more than expected. This matters because it means microplastics could reach groundwater—a source of drinking water for many people—differently than scientists assumed, and this improved model can help better predict and manage that contamination risk.
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