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The presence of microplastics (MPs) reduces the toxicity of cadmium (Cd) to Cirrhinus mrigala larva
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Low-density polyethylene microplastics partially alleviate the ecotoxicological effects induced by cadmium exposure on the earthworm Eisenia fetida
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A controlled soil experiment found that low-density polyethylene microplastics combined with cadmium did not worsen cadmium toxicity to earthworms and actually alleviated cadmium-induced DNA damage in coelomocytes, while LDPE alone had minimal effects on earthworm survival or reproduction. This counterintuitive finding suggests microplastic-metal interactions in soil are complex and not always additive, complicating risk assessments for contaminated agricultural soils.
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Researchers examined how polyethylene microplastics absorb and release cadmium, a toxic heavy metal, in freshwater conditions, finding that acidic environments can cause near-complete release of cadmium back into the water. This raises concern that microplastics carrying heavy metals could deliver those toxins to aquatic organisms through their digestive systems.
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Twenty-one-day exposures of zebrafish to PET microplastics—alone and combined with the heavy metal cadmium—caused oxidative protein damage and disrupted energy metabolism, with the mixture producing worse effects than either pollutant alone. This synergistic toxicity is significant because fish in real-world waterways encounter microplastics and heavy metals together, making combined-exposure studies critical for assessing actual ecological and food-safety risks.
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Researchers found that combined exposure to cadmium and microplastics in killifish caused oxidative stress and spinal deformities, though the two pollutants did not show clear synergistic interaction, likely because microplastics reduced cadmium bioavailability.
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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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