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Contamination knows no borders: Toxic organic compounds pollute plastics in the biodiversity hotspot of Revillagigedo Archipelago National Park, Mexico.
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Researchers found that plastic debris collected from remote, protected island beaches contained significant concentrations of toxic organic compounds including PCBs, PAHs, and pesticides. Even in locations far from direct human activity, floating plastics accumulate persistent pollutants that can be transferred to wildlife that ingest them. The study highlights that plastic pollution and chemical contamination are inseparable problems.
Plastic pollution is ubiquitous and not even remote protected islands are safe from it. Floating debris can adsorb toxic compounds that concentrate on their surface, being available to the animals that ingest them. For this reason, a baseline study of plastic pollution was conducted in the remote Revillagigedo Archipelago, in the Mexican Pacific Ocean. In 47 manta net samples an average of 4.8 plastics/1000m was found, 73% of the pieces being <5 mm. Polyethylene and polypropylene were the most common polymers found. The chemical analysis of organic pollutants revealed that organochlorine pesticides, polycyclic aromatic hydrocarbons and polychlorinated biphenyls are adsorbed on the plastics collected in the area. Filter feeding megafauna such as humpback whales, manta rays and whale sharks could ingest contaminated micro and macroplastics. Plastics were found also on the beach, where they are available to the ingestion by terrestrial animals, including endemic species endangered to extinction.
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Researchers characterized persistent organic pollutants (POPs) and polycyclic aromatic hydrocarbons (PAHs) adsorbed onto plastic fragments collected from a Colombian Caribbean beach. High concentrations of these toxic chemicals were found on weathered plastic surfaces, raising concerns about chemical transfer to organisms.
Organic pollutants in marine plastic debris from Canary Islands beaches
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Microplastic pellets and fragments collected from beaches across the Canary Islands were found to contain a wide range of organic pollutants including PCBs, PAHs, and organochlorine pesticides. The study highlights that beached microplastics in this Atlantic archipelago can be significant reservoirs of toxic organic contaminants with risks to marine organisms.
Quantification of PAHs, PCBs and Pesticides adsorbed by plastic waste in the Togolese marine environment
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Researchers analyzed plastic waste collected along the Togolese coast and found it contaminated with PAHs and PCBs, demonstrating that marine plastics act as vectors for toxic organic pollutants. This adsorption of harmful chemicals onto plastic surfaces poses risks to marine organisms and potentially to humans who consume seafood.
Organic contaminants and toxic elements in marine plastic debris, water and sediments in small freshwater lakes in a Norwegian coastal archipelago
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Researchers investigated freshwater lakes in a Norwegian coastal archipelago and found that nearby marine plastic debris was leaching harmful chemicals — including PFAS, bisphenol A, heavy metals, and cancer-linked PAHs — into the water and sediment at concerning levels. The study demonstrates that plastic pollution on coastlines can contaminate inland freshwater ecosystems far from the ocean.
Assessment of multiclass organic pollutants in microplastics from beaches of Tenerife (Canary Islands, Spain)
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Researchers analyzed polyethylene microplastics collected from three beaches in Tenerife, Spain over nine months to identify what organic pollutants were attached to them. They detected several concerning chemicals including triclosan, bisphenol A, and UV filter compounds like oxybenzone on the plastic surfaces. The findings highlight how microplastics can act as carriers for multiple classes of environmental pollutants, potentially increasing exposure risks.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.