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Visualization of fluorescent microplastics in soil column experiments in different depths
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Researchers used fluorescent microplastics in soil column experiments to visualize and track vertical transport of particles at different depths under controlled conditions. The study examined how precipitation events and soil structure influence downward translocation of microplastics in the soil profile.
Microplastics are ubiquitous in the terrestrial environment and have also been detected in soils. However, how microplastics are transported vertically in the soil is still a matter of research. Especially, the influence of precipitation, preferential pathways and bioturbation on the vertical translocation of microplastics is still unclear. One cause is the time-consuming microplastic analysis in soils that requires substantial sample pretreatment. Additionally, we are still lacking a standard protocol to quantify and qualify microplastic particles in environmental samples.Therefore, in this study, we present a method for irrigation experiments with soil column to study the vertical transport of microplastics. In the upper 2 cm of the column, fluorescent microplastics are added. We spike the irrigation water with deuterium oxide to trace the breakthrough of the water during the irrigation experiment. After the irrigation experiment, the soil column is frozen and subsequently cut in 2 cm slices and photographed under UV illumination. Then, we process the images by the software MP-VAT to analyse the distribution of the MP particles within the slices and within the soil column.
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Exploring the vertical transport of microplastics in subsurface environments: Lab-scale experiments and field evidence
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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.
Subsurface transport of microplastic particles in gravel columns: Impacts of different rain events and particle characteristics
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Researchers conducted column experiments using pre-stained microplastic particles of two density types in gravel sediment to investigate how different rainfall intensities and land-use scenarios influence the vertical transport and retention of microplastics in subsurface environments. The study found that both particle density and rainfall event characteristics significantly affected microplastic mobility through subsurface sediments, informing models of microplastic fate in soil-water systems.
An insight into laboratory column experiments for microplastic transport in soil
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This review synthesizes findings from laboratory column experiments on microplastic transport through soil, examining how particle size, shape, surface chemistry, and soil properties influence how far plastics migrate in the subsurface.
Size/shape-dependent migration of microplastics in agricultural soil under simulative and natural rainfall
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Researchers found that microplastic migration in agricultural soil under rainfall depends on particle size and shape, with smaller particles moving deeper and rainfall intensity significantly influencing vertical transport patterns in soil profiles.
Vertical transport of microplastic in agricultural soil in controlled irrigation plot experiments
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Researchers conducted field plot experiments in agricultural soil and found that microplastics migrate vertically with irrigation water, with smaller particles (53–63 µm) penetrating up to 6 cm deep and larger particles remaining near the surface, indicating that water infiltration is a key driver of subsurface plastic transport.
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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.