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The aging behaviors and release of microplastics: A review
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Microplastics’ Aging Processes in the Aquatic Environment: Aging Mechanisms, Altered Environmental Behaviors and Ecotoxicity
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This review details how physical, chemical, and biological aging processes transform microplastics in aquatic environments, altering their surface properties, pollutant adsorption capacity, and ability to leach plasticizers and flame retardants. Aged microplastics pose compounded risks to aquatic organisms and human health by acting as more potent carriers of toxic chemicals and penetrating biological tissues more readily than pristine particles.
Contaminant Release from Aged Microplastic
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Aged microplastics release a range of adsorbed contaminants, including heavy metals and persistent organic pollutants, as they weather and degrade in the environment. This contaminant release mechanism makes aged microplastics particularly hazardous vectors for chemical exposure in both wildlife and humans.
Contaminant Release from Aged Microplastic
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Aged microplastics in the environment accumulate and release contaminants through sorption and desorption processes, acting as both reservoirs and delayed-release vectors for pollutants. As plastics weather over time, their increasing surface area and altered chemistry enhance contaminant uptake and release, meaning older environmental microplastics pose escalating toxicological risks to wildlife and humans.
Effect of aging on the release of additives and the toxicity of microplastics
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Researchers found that environmental aging of PVC microplastics increases their toxicity to intestinal cells, with aged particles causing greater oxidative stress, reduced tight junction integrity, and elevated paracellular permeability compared to non-aged particles. Aging also depleted plasticizer additives like DEHP while generating the toxic metabolite MEHP, indicating that weathered microplastics pose greater gut health risks than fresh ones.
Stability of Microplastics: Detection of Potentially Harmful Compounds Produced by Microplastics During Accelerated Aging Studies
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Researchers investigate how microplastics change chemically during accelerated aging, detecting potentially harmful compounds released as plastics degrade, raising concerns about the additional toxicological risks posed by weathered microplastics beyond the particles themselves.
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