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Rapid Production of Micro- and Nanoplastics by Fragmentation of Expanded Polystyrene Exposed to Sunlight
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Researchers conducted a 24-month outdoor weathering experiment on expanded polystyrene and found it began fragmenting into micro- and nanoplastics within just one month of sunlight exposure. A single square centimeter of weathered EPS could produce approximately 67 million tiny particles. The study highlights that expanded polystyrene debris in the environment can rapidly become a massive source of secondary microplastic and nanoplastic pollution.
Expanded polystyrene (EPS) is a common plastic marine debris found in oceans worldwide. The unique "foamed" structure of EPS, which is composed of thin layers, is more vulnerable to fragmentation than bulk plastics. However, the production rate of micro- and nanoplastics by the fragmentation of EPS following sunlight exposure remains largely unknown. Here, we determined the fragmentation rate and weight loss of EPS in an outdoor weathering experiment that ran for 24 months. It took only 1 month for the weight of an EPS box to decline by 5% due to photodegradation, and approximately 6.7 × 107 micro- and nanoparticles/cm2 could be produced at a latitude of 34 °N. These results indicate that macro EPS debris can continually produce a massive number of particles within a relatively short exposure duration. The findings provide useful information to inform policymakers how rapidly to remove "likely fragmented" plastic litter from the environment.
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The fragmentation of nano- and microplastic particles from thermoplastics accelerated by simulated-sunlight-mediated photooxidation
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Researchers measured how quickly three common thermoplastics break down into micro- and nanoplastics under simulated sunlight exposure. Polystyrene fragmented fastest, in less than one year of equivalent real sunlight, followed by polypropylene in under two years and polyethylene in over three years. The findings help estimate how quickly plastic litter in the environment generates secondary microplastic pollution, which could inform cleanup timelines and priorities.
Swelling-Induced Fragmentation and Polymer Leakage of Nanoplastics in Seawater
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Researchers tracked polystyrene nanoplastics in seawater over 29 days under simulated sunlight and found that light accelerates aggregation, while also inducing swelling and fragmentation of particles and leaching of polymer components, complicating predictions of nanoplastic fate and risk in marine environments.
Nanofragmentation of Expanded Polystyrene Under Simulated Environmental Weathering (Thermooxidative Degradation and Hydrodynamic Turbulence)
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Researchers studied the combined effect of UV oxidation and mechanical abrasion on the fragmentation of expanded polystyrene under simulated marine weathering conditions. They found that oxidative degradation and mechanical stress together drive the breakdown of macroplastics into micro- and nanoscale particles in the ocean.
Simulated environmental weathering of expanded polystyrene foam and polypropylene under UV and wave agitation
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Researchers simulated environmental weathering of expanded polystyrene foam and polypropylene bags under UV light and wave action, finding that polystyrene degraded faster, showing cracking, discoloration, and fragmentation even without water. Polypropylene was more resistant but still broke down under combined UV and wave conditions, demonstrating how sunlight and water movement accelerate the formation of secondary microplastics from common plastic waste.
Analysis of ultraviolet and thermal degradations of four common microplastics and evidence of nanoparticle release
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Researchers studied how UV light and elevated temperature break down four common plastics and found that weathering releases nanoscale plastic particles. Polystyrene and polypropylene were particularly susceptible to UV degradation, generating significant numbers of nanoparticles. The findings confirm that environmental conditions actively fragment microplastics into even smaller, potentially more harmful nanoplastics.
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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.