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UV exposure to PET microplastics increases their downward mobility in stormwater biofilters undergoing freeze–thaw cycles
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Researchers found that UV weathering of PET microplastics increases their downward mobility in stormwater biofilters undergoing freeze-thaw cycles, as UV exposure creates polar surface groups that decrease hydrophilicity and enhance particle transport.
An increase in microplastic weathering under UV lights decreases their surface hydrophilicity by the formation of polar groups and increases their mobility in the stormwater biofilter under freeze–thaw cycles.
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Researchers discovered that freeze-thaw cycles move deposited microplastics deeper into stormwater biofilter soil than simple drying-and-wetting cycles, because expanding ice crystals break up the soil and release trapped particles. This finding suggests that in cold climates, microplastics filtered from stormwater could migrate further underground than previously estimated.
Transport of microplastics in stormwater treatment systems under freeze-thaw cycles: Critical role of plastic density
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Researchers found that freeze-thaw cycles transport microplastics downward through stormwater treatment system substrates, with plastic density being a critical factor determining how far MPs migrate. Dense PET microplastics penetrated deepest, raising concern that treatment systems in cold climates may inadvertently channel MPs toward groundwater during winter thaw cycles.
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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.