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Polyethylene and Polypropylene Microplastics Reduce Chemisorption of Cadmium in Soil and Increase its Bioaccessibility
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Polypropylene microplastics alter the cadmium adsorption capacity on different soil solid fractions
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Researchers found that polypropylene microplastics reduce soil's ability to bind the toxic heavy metal cadmium, with the effect varying by soil composition and microplastic aging — suggesting that microplastic contamination could indirectly increase the risk of heavy metals leaching into groundwater.
Enhanced Adsorption of Cadmium onto Microplastics Derived from Polyethylene Mulching Film by Weathering
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Weathered polyethylene microplastics from agricultural mulch film showed more than four times greater adsorption capacity for cadmium ions compared to pristine particles, driven by increased surface roughness and oxygen-containing functional groups that develop during environmental aging. Because weathered microplastics are far more common in real environments than pristine particles, this finding significantly elevates the estimated risk of microplastics acting as vectors for heavy metal transport in contaminated soils and water.
Relevance of dissolved organic matter components on the adsorption behaviors of cadmium onto non-biodegradable and biodegradable microplastics in an agricultural soil
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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.
A potential threat from biodegradable microplastics: mechanism of cadmium adsorption and desorption in the simulated gastrointestinal environment
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Laboratory experiments found that biodegradable polylactic acid (PLA) microplastics adsorb significant amounts of cadmium, and simulated gastrointestinal digestion dramatically increased cadmium bioaccessibility — 19% released in the gastric phase and 62% in the intestinal phase — far exceeding conventional PP and PA microplastics. This indicates that biodegradable plastics marketed as environmentally safer alternatives may pose heightened risks as heavy metal vectors in the human gut, challenging assumptions about their safety.
Effect of Microplastics on the Adsorption and Desorption Properties of Cadmium in Soil
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Polyethylene and polypropylene microplastics were found to reduce soil's capacity to adsorb cadmium, a toxic heavy metal, raising concerns that microplastic contamination in farmland soils could increase the mobility and risk of heavy metal pollutants.
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