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Synergistic modulation of Lead (II) bioavailability by polyethylene terephthalate microplastics and insights into assimilation kinetics in Canna indica
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Scientists found that tiny plastic particles (microplastics) in soil can make plants absorb up to 250% more lead, a toxic heavy metal that's harmful to humans. This happens because the plastic pieces act like a delivery system, carrying more lead into plants that we might eventually eat. This research suggests that areas with plastic pollution in the soil could pose greater health risks than previously thought, especially for crops grown in contaminated areas.
The proliferation of microplastics (MPs) in terrestrial ecosystems has introduced a novel variable into the biogeochemical cycling of heavy metals. This study elucidates the role of Polyethylene Terephthalate (PET) microplastics in modulating the bioavailability and assimilation kinetics of Lead(II) ions Pb2+ in Canna indica. Through a 35-day microcosm experiment, we investigated the interplay between PET dosage (0.5–2.5 g), initialPb2+concentration (5–45 mg/L), and soil pH (4.0–7.0). Our findings reveal a significant "vector effect," where PET amendment increased Pb uptake by up to 250% compared to MP-free controls. Assimilation was highest under acidic conditions (pH 4.0), reaching 4.529 mg g-1, suggesting that pH-mediated desorption from PET surfaces governs metal mobility. The uptake behavior conformed to the Freundlich isotherm (R2 > 0.98), indicating a multi-layer, heterogeneous sorption process, while pseudo-first-order kinetics highlighted a time-dependent saturation of plant tissues. These results underscore the potential for microplastics to exacerbate heavy metal bioaccumulation in phytoremediation-relevant species, necessitating a re-evaluation of soil safety standards in plastic-contaminated agricultural zones.
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Microplastics in Mediterranean Agricultural Soils: Effects on Soil Properties, Metal Accumulation in Plants, and Implications for Sustainable Agroecosystems
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Scientists found that tiny plastic particles in soil make it easier for toxic metals like lead and zinc to move into plants we might eat. Even small amounts of microplastics changed how metals behave in the soil, with some types of plastic causing up to 20% more metal absorption in plants. This matters because these contaminated plants could end up in our food supply, potentially increasing our exposure to harmful metals.
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Researchers grew lettuce in contaminated soil mixed with different types of microplastics, including fibers, glitter, and fragments from bags and bottles. They found that microplastics altered how heavy metals like lead, cadmium, and copper moved through the soil and into the plants, sometimes increasing uptake of toxic metals in roots while decreasing others in leaves. The results raise concerns about food safety in agricultural areas where both microplastic and heavy metal contamination overlap.
Impact of microplastics on bioaccumulation of heavy metals in rape (Brassica napus L.)
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Researchers found that microplastics influenced the bioaccumulation of copper and lead in rapeseed plants, with effects varying by microplastic concentration and heavy metal type, revealing how plastic pollution may alter contaminant uptake in crops.
Influence of polyethylene-microplastic on environmental behaviors of metals in soil
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Researchers investigated how polyethylene microplastics affect the adsorption, desorption, and bioavailability of heavy metals in soil. They found that adding microplastics altered how metals bind to soil particles and increased the mobility of certain metals like cadmium and lead. The study suggests that microplastic contamination in soils may change the environmental behavior of heavy metals, potentially increasing their availability to plants and soil organisms.
Exploring the interaction between microplastics and heavy metals: unveiling the impact of microplastics on lead sorption and desorption in soil
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Researchers conducted batch experiments to examine how high-density polyethylene microplastics affect the adsorption and desorption of lead in agricultural soil under different conditions, finding that equilibrium was reached within 120 minutes and that microplastics altered lead sorption kinetics. The presence of HDPE microplastics changed soil's capacity to retain or release lead, which has implications for heavy metal mobility and crop uptake in contaminated farmland.
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