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Release of Additives and Non-Intentionally Added Substances from Microplastics Under Environmentally Relevant Conditions
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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.
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.
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.
Sorption of Potentially Toxic Elements to Microplastics
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Researchers reviewed how microplastics can adsorb toxic heavy metals from their surrounding environment, effectively acting as vehicles that concentrate and transport harmful elements. This sorption behavior increases the potential risk microplastics pose to organisms that ingest them, including humans.
Sorption of Potentially Toxic Elements to Microplastics
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Microplastics readily sorb potentially toxic elements including heavy metals and metalloids from surrounding water, acting as concentrated carriers of these hazardous substances through aquatic food webs. This sorption capacity amplifies the toxicological risk of microplastic ingestion for organisms, including humans who consume contaminated seafood.
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