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Effects of solution chemistry and humic acid on the transport of polystyrene microplastics in manganese oxides coated sand
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Column experiments showed that polystyrene microplastics had significantly lower mobility through manganese oxide-coated sand than bare sand due to electrostatic attraction and surface roughness, with humic acid increasing transport and co-transport with cadmium reducing it.
Microplastics as the emerging persistent pollutants have attracted more attention in the terrestrial environments. In this study, the transport behavior of polystyrene microplastics (PSMPs) in manganese oxides coated sand (MOCS) was examined under different pH, ionic strength (IS), cationic type and humic acid (HA) conditions. Compared with the transport behavior of PSMPs in the bare sand, the mobility of PSMPs in MOCS was significantly lower and less affected by pH, IS and cation type, which can be attributed to the existence of attractive electrostatic force and rougher collector surfaces of MOCS. Specifically, the transport of PSMPs was inhibited when cotransport with Cd. Furthermore, the HA significantly increased the transport of PSMPs in the MOCS, and the mobility increased with the increase of HA concentration ranged from 0 to 10 mg L. The results can contribute to the further understanding of the migration mechanism and fate of microplastics in the soil system.
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Researchers investigated how graphene oxide nanoparticles and humic acid influence the transport of polystyrene microplastics through sand columns, comparing bare quartz sand with iron oxide-coated sand. They found that iron oxide-coated sand strongly retained microplastics regardless of other factors, while graphene oxide significantly promoted microplastic transport by increasing surface charge and creating steric barriers. The study suggests that the co-presence of nanomaterials and organic matter in the environment can significantly alter how microplastics move through soil and groundwater systems.
Co-transport of polystyrene microplastics and kaolinite colloids in goethite-coated quartz sand: Joint effects of heteropolymerization and surface charge modification
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Column experiments showed that kaolinite colloids enhanced polystyrene microplastic transport through quartz sand but had more complex effects in goethite-coated sand, where the promotion depended strongly on ionic strength conditions due to heteropolymerization and surface charge modification.
Transport of nanoplastics in porous media with ferrihydrite–humic acid coprecipitation: Effect of solution chemistry, nanoplastic size and aging degree
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Researchers investigated how ferrihydrite-humic acid coprecipitates in soil affect nanoplastic transport through sand columns, finding that the mineral-organic coating weakens iron oxide retention of polystyrene nanoplastics via steric hindrance and added negative charge, and that UV aging further enhances nanoplastic mobility by increasing surface hydrophilicity and electrostatic repulsion.
Combined Effects of Fe/Al Oxyhydroxide Coating and pH on Polystyrene Nanoplastic Transport in Saturated Sand Media
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Researchers found that soil pH and iron or aluminum mineral coatings on sand grains strongly control how far nanoplastics travel through the ground, with acidic, mineral-rich conditions trapping particles more effectively — findings that could help predict nanoplastic contamination of groundwater.
Impact of particle size and oxide phase on microplastic transport through iron oxide-coated sand
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Researchers studied how different types of iron oxide coatings on sand affect the movement of polystyrene microplastics through soil. They found that magnetite-coated sand retained the most microplastics, while goethite-coated sand retained the least, with results matching theoretical predictions. The findings suggest that naturally iron-rich soils could serve as effective barriers to prevent microplastic transport through groundwater systems.
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