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Interplay of microplastics and bioturbation on atrazine dynamics in aquaculture sediments
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Scientists studying tidal flat farms found that microplastics in the sediment can trap the weed-killer atrazine, and when this plastic has been weathered by the environment ("aged"), it traps even more of the chemical. The catch: this trapped pesticide builds up more heavily inside razor clams grown in these waters, meaning the seafood on your plate could carry higher levels of both the pesticide and its breakdown products. This matters because it shows plastic pollution isn't just an isolated problem—it can team up with other pollutants to increase contamination risks in the food we eat.
Tidal flats are increasingly polluted by pesticides and microplastics (MPs). Bioturbation by benthic organisms shapes sedimentary processes and contaminant fate, yet its combined effects with MPs on pollutants like atrazine (ATZ) remain unclear. This study investigated ATZ migration, transformation, and bioaccumulation in sediments simulating Sinonovacula constricta aquaculture under bioturbation and exposure to virgin or aged polystyrene MPs. Results showed that bioturbation facilitated vertical ATZ migration. MPs adsorbed ATZ, with aging enhancing adsorption, thereby suppressing ATZ release into overlying water and promoting sediment retention. Under combined exposure, MPs adsorption-inhibition outweighed bioturbation's transport promotion. ATZ mainly transformed to hydroxyatrazine, with enhanced degradation in surface layers under both influences. Notably, aged MPs significantly increased ATZ and metabolite accumulation in Sinonovacula constricta, indicating potential higher ecological risks. This study highlights the complex interplay between MPs and bioturbation in shaping herbicide fate in coastal sediments, providing insights for risk assessment and management of combined pollution in aquaculture ecosystems.
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New insights for microplastic degradation: Synergistic degradation mechanisms of microplastics and atrazine in sediments
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Researchers conducted a 90-day experiment to study how the pesticide atrazine interacts with different types of microplastics in sediments, finding that atrazine adsorption actually increased microplastic mass loss by up to 175 percent. Metagenomic analysis revealed that the combination fostered distinct microbial communities on the plastic surfaces that enhanced biodegradation. The study provides new insights suggesting that co-contamination of microplastics and pesticides may paradoxically accelerate microbial breakdown of both pollutants in sediments.
Interactions between microplastics from agricultural films and soil in regulating atrazine adsorption: A mechanistic and environmental relevance study.
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Lab tests mixed microplastics from weathered or new plastic farm films into soil to see how they affect the soil's ability to hold the pesticide atrazine. Weathered plastic particles, which had rougher surfaces and oxygen-containing chemical groups, bound atrazine more strongly than new plastic, with particle size, amount of plastic, and aging level all affecting the results.
Effects of microplastics on the environmental behaviors of the herbicide atrazine in soil: Dissipation, adsorption, and bioconcentration
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Researchers examined how the presence of microplastics in soil affects the behavior of the herbicide atrazine, including how quickly it breaks down and how much is absorbed by plants. They found that microplastics reduced the herbicide's half-life in soil, increased its adsorption to soil particles, and significantly boosted its uptake into plant tissues. The study suggests that microplastic contamination in agricultural soils could change how pesticides behave, potentially increasing crop contamination.
Behavior and mechanism of atrazine adsorption on pristine and aged microplastics in the aquatic environment: Kinetic and thermodynamic studies
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Researchers systematically explored how the pesticide atrazine adsorbs onto both pristine and aged microplastics in aquatic environments. The study found that aged microplastics had higher adsorption capacities than pristine ones, with the aging process and pH significantly affecting surface charge and adsorption behavior, suggesting that weathered microplastics may carry greater loads of chemical contaminants.
Interaction of nanoplastics and atrazine in a hydroponic system: Antagonistic phytotoxicity mediated by plant-microbe crosstalk and root endophytic bacteria restructuring
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Scientists studying plants grown in water contaminated with both tiny plastic particles and a common weed-killer (atrazine) made a surprising discovery: the plastic actually reduced some of the herbicide's toxic effects on the plants, rather than making things worse. This matters because it shows that pollutants don't simply add up to create bigger problems—they can interact in complex, sometimes unexpected ways, which is important as both microplastics and pesticide residues increasingly turn up together in our water and food systems. While this study focused on plant health, it's a reminder that assessing real-world environmental and food safety risks requires looking at how cont
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