We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Vertical distribution and migration of microplastics in soils from Fars Province, Southwest Iran.
AI summary Read the abstract
Scientists digging deep into soil in Iran (down to nearly 5 feet) found tiny plastic bits, mostly plastic fibers, at every depth—not just near the surface where you'd expect. This suggests plastic pollution can travel downward through cracks and soil movement over time, raising concerns that it could eventually reach groundwater—the source of drinking water for many communities. While this study didn't directly test human health effects, it adds to growing evidence that microplastics are working their way deeper into our environment than previously thought.
Microplastics (MPs) in soils are becoming increasingly recognised as important terrestrial contaminants, yet their vertical distribution below the plough layer remains poorly understood. Here, we examined 76 genetic soil horizons from 27 profiles along four transects spanning managed and unmanaged land uses in Fars Province, southwest Iran, to depths of up to 140 cm. A total of 392 MPs were recovered from 71 of 76 samples, comprising 342 fibres (87.2%), 48 fragments or films and two spherules, with concentrations reaching about 320 particles kg-1 of dry soil. Raman analysis of 98 representative particles showed a dominance of polyamides, polyesters and polyolefins. MP abundance, size and polymer type were heterogeneous among sites and horizons, and only a few statistically significant relationships with soil properties were observed (notably inverse relationships with sand at Darab and silt at Sarvestan). MPs occurred throughout the profiles, including the deepest horizons, with no consistent size- or polymer-related fractionation with depth. These observations indicate sustained MP accumulation in soils and suggest that downward transport can occur under arid to semi-humid conditions through percolation, drying-cracking of the substrate and bioturbation. Because strong local point sources were not evident at most sites and fibres dominated the assemblage, atmospheric deposition is considered a major contributor at the soil surface, although additional source-specific data are needed to confirm this inference. The persistence and vertical mobility of MPs in Fars soils indicate potential risks to subterranean ecosystems and groundwater quality.
More Papers Like This
Graphical_Abstract.
AI summary Read the abstract
Scientists digging deep into soils in Iran (down to nearly 5 feet) found tiny plastic bits, mostly fibers likely from clothing and textiles, scattered throughout—not just near the surface. This suggests plastics can travel down through soil over time via water, cracks, and even worms and burrowing critters, raising concerns that microplastics could eventually reach groundwater, the source of much of our drinking water. While this study didn't directly test human health effects, it adds to growing evidence that plastic pollution is seeping deeper into the environment than previously thought, potentially affecting the water we drink and the ecosystems
Vertical distribution and migration of microplastics in soils from Fars Province, southwest Iran
AI summary Read the abstract
Researchers characterised microplastics in soil horizons down to 140 cm depth along four transects in Iran's Fars Province, covering managed and unmanaged land uses. Microplastic abundance and polymer types varied with depth and land use, with deeper horizons showing evidence of vertical migration through soil profile.
Vertical distribution and multi-source pathways of microplastics in agricultural soils: A study of typical irrigation areas in the upper Yellow River basin
AI summary Read the abstract
Researchers found that farmland soil in the upper Yellow River region contained significantly more microplastics than nearby forest or grassland, with plastics detected in all soil layers down to one meter deep. Flood-style irrigation pushed microplastics much deeper into the ground than drip irrigation, doubling contamination levels. This is concerning because microplastics migrating deep into agricultural soil could eventually reach groundwater that people depend on for drinking water.
Vertical distribution and post-depositional translocation of microplastics in a Rhine floodplain soil
AI summary Read the abstract
Researchers analyzed a 110-centimeter-deep soil profile from a German river floodplain and found microplastics at every depth, including in layers deposited before the 1950s, suggesting earthworms and plant roots transported particles downward over time. This vertical movement means small microplastics travel deeper into soils than previously thought and complicates using them as markers for recent human impact.
Investigation into the Vertical Migration of Microplastic in Agricultural Soil
AI summary Read the abstract
Researchers investigated how microplastic particles migrate vertically through agricultural soil profiles, finding that particle size, soil texture, and water flow influence how deeply plastics penetrate. This study highlights agricultural soils as both a sink and a potential pathway for microplastic transport to groundwater.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.