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Microplastics as heavy metal vectors in the freshwater environment: Distribution, variations, sources and health risk
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Researchers reviewed how microplastics in freshwater act as sponges for heavy metals like lead and mercury, binding these toxic substances to their surfaces and potentially delivering a double dose of harm to aquatic life and the humans who depend on freshwater sources for drinking and food.
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This review examined how microplastics interact with heavy metals in aquatic environments, showing that temperature, pH, salinity, polymer type, and particle size modulate adsorption, desorption, and combined toxicity, with MPs acting as mobile heavy metal carriers throughout aquatic food webs. Understanding the synergistic toxicity of MPs and heavy metals is essential because their combined effects on aquatic organisms—and on humans consuming contaminated seafood—likely exceed the hazard of either pollutant alone.
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A study of urban river sediments in China found microplastic abundances averaging 4,388 items per kilogram of dry sediment, with a significant linear correlation between MP abundance and the ecological risk index of co-occurring heavy metals including cadmium, copper, and arsenic. The findings confirm that microplastics act as carriers concentrating heavy metals above ambient sediment levels, compounding their toxicological threat to aquatic wildlife and humans through food chain contamination.
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