Effects of exposure of polyethylene microplastics to air, water and soil on their adsorption behaviors for copper and tetracycline

Simultaneous adsorption of Pb2+ and tetracycline onto pristine and aged polypropylene microplastics

Polyethylene Microplastics Modulate the Copper Adsorption–desorption Processes in Agricultural Soils

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Batch adsorption experiments showed that adding 1% polyethylene microplastics to two agricultural soils modestly increased copper adsorption capacity while altering desorption behavior in soil-type-dependent ways. This matters because microplastic accumulation in farmland can disrupt heavy metal cycling, potentially increasing bioavailability of toxic metals like copper in crops and the humans and animals that consume them.

Effects of biofilm modification on polyethylene microplastics-associated sulfamethazine adsorption

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A 28-day study found that biofilm colonization on polyethylene microplastics increased their adsorption of the antibiotic sulfamethazine by 2–2.6-fold, driven by hydrogen bonding, electrostatic, and CH/π interactions. This demonstrates that microplastics in aquatic environments become more dangerous over time as biofilms form on their surfaces, amplifying their ability to accumulate and transport harmful pollutants through ecosystems.

Study on Copper Desorption Behavior from Microplastic Particles in Different Media

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"Researchers studied how copper (Cu(II)) desorbs from polystyrene microplastics in three different media—pure water, artificial seawater, and simulated gastric fluid—finding that desorption was fastest in gastric fluid, meaning microplastics release more heavy metal contamination once ingested. This reveals that microplastics acting as Trojan horse carriers for heavy metals pose a heightened risk inside the digestive systems of warm-blooded animals, including humans."

Adsorption of Tylosin and Tetracycline onto Microplastics: Behavior and Effects of Adsorbents and Salinity

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Batch adsorption experiments showed that polyethylene, polystyrene, and PVC microplastics can adsorb the antibiotics tylosin and tetracycline, with PVC showing the highest adsorption capacity and salinity enhancing tylosin uptake through a salting-out effect. This confirms that environmental microplastics act as mobile carriers for antibiotic pollutants, potentially spreading antimicrobial resistance to new ecosystems and amplifying the health risks of plastic pollution.