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Hazardous Chemicals in Plastics in Marine Environments: International Pellet Watch
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Plastic pellets collected from beaches worldwide through the International Pellet Watch program contained high concentrations of persistent organic pollutants including PCBs and DDT derivatives sorbed from surrounding seawater, demonstrating that marine plastics act as global concentrators and transporters of hazardous chemicals. This chemical accumulation on microplastics raises concerns about toxin transfer to marine organisms that ingest plastic debris, and ultimately to humans through seafood consumption.
Marine plastic debris, including microplastics <5 mm, contain additives as well as hydrophobic chemicals sorbed from surrounding seawater. A volunteer-based global monitoring programme entitled International Pellet Watch (IPW) is utilizing the sorptive nature...
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Plastics and microplastics have achieved near-universal distribution in marine environments from surface waters to deep-sea sediments, persisting for decades while fragmenting into increasingly smaller and more biologically available particles. The growing concentration of microplastics in oceans represents a long-term threat to marine biodiversity and the food safety of seafood consumed globally.
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"This overview documents the surge in global plastic production and the resulting ubiquitous environmental contamination by plastics and microplastics across terrestrial, freshwater, and marine systems. Understanding the full scope of plastic pollution is foundational for assessing human health risks, as microplastics are now found in food, water, and air consumed daily by billions of people."
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Increasing plastic production, combined with inadequate end-of-life waste management, is driving a growing flux of plastic debris into the ocean through rivers, wind, and coastal sources, where it fragments into persistent microplastics carrying chemical additives and sorbed pollutants. Addressing this requires systemic changes across plastic production, use, and disposal to prevent continued contamination of marine ecosystems and the food chains they support.
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