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Weathering increases the acute toxicity of plastic pellets leachates to sea-urchin larvae—a case study with environmental samples
Summary
Researchers tested whether weathered plastic pellets collected at increasing distances from a production facility are more toxic to sea urchin larvae than fresher pellets. They found that pellets collected farther from the source, which had undergone more environmental weathering, were significantly more toxic to developing larvae. The study suggests that as plastic pellets age in the environment, they may become increasingly harmful to marine life.
Microplastics, particles under 5 mm, pervade aquatic environments, notably in Tarragona's coastal region (NE Iberian Peninsula), hosting a major plastic production complex. To investigate weathering and yellowness impact on plastic pellets toxicity, sea-urchin embryo tests were conducted with pellets from three locations-near the source and at increasing distances. Strikingly, distant samples showed toxicity to invertebrate early stages, contrasting with innocuous results near the production site. Follow-up experiments highlighted the significance of weathering and yellowing in elevated pellet toxicity, with more weathered and colored pellets exhibiting toxicity. This research underscores the overlooked realm of plastic leachate impact on marine organisms while proposes that prolonged exposure of plastic pellets in the environment may lead to toxicity. Despite shedding light on potential chemical sorption as a toxicity source, further investigations are imperative to comprehend weathering, yellowing, and chemical accumulation in plastic particles.
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