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61,005 resultsShowing papers similar to Litter in Urban Areas May Contribute to Microplastics Pollution: Laboratory Study of the Photodegradation of Four Commonly Discarded Plastics
ClearPhotodegradation of macroplastics to microplastics : A laboratory study on common litter found in urban areas
A laboratory study used UV light to simulate how plastic litter found in urban environments degrades into microplastics over time. The results help explain the pathway from discarded plastic items to the small fragments now found across the environment, from soils to human tissues.
Plastic litter fate and contaminant transport within the urban environment, photodegradation, fragmentation, and heavy metal uptake from storm runoff
Researchers studied how plastic litter in urban environments degrades into microplastics through sun exposure and examined the capacity of these fragments to absorb heavy metals from stormwater runoff. The study found that photodegradation of polyethylene and PET creates microplastic fragments that can then pick up heavy metal contaminants from urban runoff, compounding their environmental impact.
Quantitative study of microplastic degradation in urban hydrosystems: Comparing in situ environmentally aged microplastics vs. artificially aged materials generated via accelerated photo-oxidation
Researchers compared how polyethylene microplastics degrade in real urban water environments versus under controlled laboratory UV exposure. They found that lab-aged plastics showed primarily physical and chemical changes from UV light, while microplastics collected from stormwater and sediments also showed signs of biological degradation and hydrolysis. The study demonstrates that artificial aging alone does not fully replicate the complex degradation processes microplastics undergo in actual urban water systems.
From macroplastics to microplastics: Role of water in the fragmentation of polyethylene
Laboratory photodegradation experiments compared how polyethylene plastic films fragment in water versus air under UV light, finding that the aquatic environment significantly influences the physical and chemical breakdown of plastic into microplastics. The study improves understanding of how water immersion changes the photodegradation pathways of floating and submerged plastic debris.
UV Irradiation of Polyethylene Terephthalate and Polypropylene and Detection of Formed Microplastic Particles Down to 1 μm
UV irradiation experiments showed that both polypropylene and PET plastics rapidly shed microplastic particles down to 1 micrometer in size when exposed to UV light in water, with recycled PET producing significantly more particles than virgin PET. This confirms that UV weathering — occurring continuously outdoors — is an active mechanism generating very small microplastics from everyday plastic products and packaging.
Laboratory-Simulated Photoirradiation Reveals Strong Resistance of Primary Macroplastics to Weathering
Laboratory weathering experiments showed that common plastic items (HDPE, LDPE, PP, PS, PC) retain their bulk structural integrity even after simulated UV and mechanical exposure equivalent to decades of coastal conditions, yet shed a thin surface layer rich in microplastic fragments. This means macroplastics in the ocean act as a persistent, long-term source of microplastic particles even when they appear physically intact.
Aging simulation of thin-film plastics in different environments to examine the formation of microplastic
Researchers aged polyethylene, polypropylene, and polystyrene thin films under land, freshwater, estuarine, and oceanic conditions, finding that UV radiation was the primary driver of surface degradation and microplastic formation, with degradation rates varying substantially by environmental medium.
Aging assessment of microplastics (LDPE, PET and uPVC) under urban environment stressors
Researchers aged LDPE, PET, and uPVC microplastics using ozone, UV-C, and solar radiation to simulate urban environmental stressors, finding that each aging agent produced distinct changes in surface morphology, chemical structure, and crystallinity that could alter particle behavior in the environment.
Combined Effects of UV Exposure Duration and Mechanical Abrasion on Microplastic Fragmentation by Polymer Type
Researchers studied how UV exposure duration and mechanical abrasion combine to fragment different plastic types under simulated beach conditions. They found that polypropylene was far more susceptible to fragmentation than polyethylene after UV weathering, while expanded polystyrene broke apart readily even without UV exposure. The experiments showed that a large fraction of fragmented particles were too small to recover, suggesting that significant amounts of nanoplastic are being generated on beaches.
Photo-induced degradation of single-use polyethylene terephthalate microplastics under laboratory and outdoor environmental conditions
Researchers tested how sunlight, water, and physical wear work together to break down PET microplastics, the type commonly found in plastic bottles and food packaging. Over 60 days, combined UV light and water exposure caused significant chemical degradation of the plastic surfaces. This matters because as microplastics break down in the environment, they release smaller fragments and potentially harmful chemicals that are easier for organisms to absorb.
Quantitative Analysis of Urban Microplastic Dissemination and Accumulation in Marine Ecosystems: Pathways, Processes, and Impacts
Researchers used water and sediment sampling across urban, riverine, and marine environments to quantify microplastic pathways from cities into marine ecosystems, finding the highest concentrations in urban areas linked to industrial activity and poor waste management. Polyethylene, polypropylene, and PET were the most common polymer types, with seasonal peaks in concentration tracking periods of high rainfall and urban runoff.
Microplastic emission characteristics of stormwater runoff in an urban area: Intra-event variability and influencing factors
Researchers investigated microplastic emission characteristics in urban stormwater runoff from industrial and residential catchments. Microplastics were detected in concentrations of 54 to 639 particles per liter, with polypropylene and polyethylene being the dominant polymers and fragments the most common shape, and concentrations were higher after longer dry periods.
Plastic fragmentation in the environment
This thesis investigates how larger plastic items fragment into microplastics in different environments—air, freshwater, and seawater—finding that plastic degrades fastest when exposed to air and sunlight, and much more slowly in water. The findings suggest that land-based plastic waste exposed to sunlight is a major source of microplastics that eventually enter the marine environment.
From Macro to Micro Plastics; Influence of Photo-oxidative Degradation
This study used simulated UV aging to investigate how photo-oxidative degradation of common plastics drives fragmentation from macro to micro scale, characterizing the surface property changes and structural breakdown that generate microplastic particles in the environment.
Characterization and comparison of microplastic occurrence in point and non-point pollution sources
Wastewater, stormwater runoff, and surface water samples from multiple catchment types were compared for microplastic content, with PET dominating in urban and non-point sources while rubber from tire wear dominated highway runoff, and particles smaller than 0.5 mm passing through both wastewater and stormwater treatment systems.
Linking UV aging of polymers and microplastics formation: An assessment employing various characterization techniques
Researchers examined the link between UV aging of plastic polymers and the generation of microplastics in marine environments, using environmental assessment tools to model the process. The study clarifies how photodegradation rates and polymer type influence the rate and quantity of microplastic formation.
Method for quantification of microplastic release from plastic-based materials during weathering
Researchers developed a method to quantify microplastic release from plastic-based materials during weathering, responding to the need for limits on how much MP a product can release over its lifetime. The method enabled standardized measurement of MP generation from photodegradation during product use and end-of-life mismanagement.
Microplastics Generation: Onset of Fragmentation of Polyethylene Films in Marine Environment Mesocosms
Researchers investigated how high-density polyethylene films from plastic bags fragment into microplastics under simulated beach and nearshore conditions over six months. The study found that natural sunlight exposure on sand or in seawater caused measurable degradation, providing evidence for how everyday plastic bags break down into microplastic particles in marine environments.
Pavement wear generates microplastics in stormwater runoff
Researchers conducted a two-year field study showing that pavement wear is a distinct and previously underappreciated source of microplastics in urban stormwater, separate from tire wear. They found that asphalt pavement was most susceptible to degradation in the field, while recycled rubber pavers released the most microplastics in lab testing. The study emphasizes the need to consider microplastic generation during pavement material selection and urban infrastructure planning.
Microplastics formation based on degradation characteristics of beached plastic bags
Laboratory weathering of plastic bags under UV and mechanical stress produced microplastic fragments of varied sizes and shapes, with degradation rate and fragment characteristics depending on the bag material and environmental conditions.
Degradation of polypropylene : proportion of microplastics formed and assessment of their density.
This study quantified microplastic formation during UV degradation of polypropylene and characterized the chemical changes in the polymer structure caused by photooxidation. UV exposure was shown to generate new particles and alter chemical composition in ways that may change microplastic toxicity and environmental behavior.
Macro-plastic weathering in a coastal environment: field experiment in Chesapeake Bay, Maryland
Field experiments in Chesapeake Bay tracked how macroplastic items of different polymer types weathered and fragmented over time in a coastal environment. The study found that UV exposure and wave action caused rapid surface degradation and fragmentation, with important implications for how quickly plastic pollution generates secondary microplastics in coastal zones.
Linking UV aging of polymers and microplastics formation: An assessment employing various characterization techniques
This study used environmental assessment tools to model how UV aging of plastic polymers drives microplastic formation in marine environments. The analysis identified polymer-specific degradation rates and environmental conditions that accelerate the conversion of plastic debris into microplastics.
Study of the litter in the urban environment as primary and secondary microplastics sources
Researchers studied urban litter as a source of both primary and secondary microplastics in cities across Khuzestan province, Iran, using environmental cleanliness indices. They found that the density of primary microplastic sources from littering was substantially higher than secondary sources, with an estimated 150 grams of primary microplastics released per year per city from litter alone. The study highlights the importance of improving urban waste management to control one of the most dispersed sources of microplastic pollution.