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Typical Microplastics in Field and Facility Agriculture Dynamically Affect Available Cd in Different Soil Types Through Physicochemical Dynamics of Carbon, Iron and Microbes

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Typical microplastics in field and facility agriculture dynamically affect available cadmium in different soil types through physicochemical dynamics of carbon, iron and microbes

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Researchers found that polyurethane and polypropylene microplastics dynamically affect cadmium availability in different soil types through changes in soil carbon chemistry, iron mineral forms, and microbial community composition, with effects varying between field and greenhouse agricultural conditions.

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Plastic mulch used in farming can break down into microplastics that stay in the soil, and this study found that these tiny plastic bits can make copper and phosphorus, common soil nutrients and contaminants, more likely to wash away instead of staying put. This matters because looser, more mobile copper and phosphorus can end up leaching into groundwater or nearby streams, potentially polluting the water we drink and use, especially in farmland already exposed to plastic mulch and these chemicals.

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Researchers found that microplastics in agricultural soil — both conventional and biodegradable types — reduce the soil's ability to bind cadmium, a toxic heavy metal, largely by altering organic matter that controls metal mobility. This suggests microplastic contamination could increase cadmium availability in farmland, raising potential food safety concerns.

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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.

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