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Unlocking the microplastics amplification effect: How biochar counters heavy metal risks by driving speciation shifts and reversing soil property degradation
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Microplastics in soil make toxic heavy metals like lead and cadmium more available to plants, meaning crops grown in contaminated soil could absorb more of these harmful substances into food. Adding biochar—a charcoal-like material made from wood chips or straw—to soil helped reverse this problem by improving soil health and locking lead into safer forms, cutting its uptake in lettuce by about a quarter. This matters because it points to an affordable way to reduce heavy metal contamination in food crops grown in polluted soil, though the treatment worked less well against cadmium, so it's not a complete fix.
Microplastics and heavy metal co-contamination exacerbate risks to soil-plant ecosystem, yet remediation mechanisms remain unclear. This study demonstrated polystyrene microplastics reduce soil pH and soil organic (SOM), while increasing redox potential and zeta potential, suppressing urease, alkaline phosphatase, and sucrase activity, causing declines in soil total nitrogen, available phosphorus and potassium, inhibiting lettuce growth and increasing Pb and Cd significantly. Applying wood chip and straw biochar reversed soil pH to alkaline condition, enhanced reductivity, increased SOM by 47.68-50.46%, restored enzyme activity by 73.35-242.76%, improved nutrient availability, and significantly reduced Pb and Cd accumulation. Key mechanisms first revealed involve biochar synchronously correcting microplastic-induced soil acidification, organic matter loss, and dispersion through synergistic pH, SOM, and zeta potential adjustments. Biochar alleviated ecological hazards through dual pathways whereby increased SOM activated soil enzymes and phosphorus availability, promoted chlorophyll synthesis, and increased biomass by 23.46-29.23%; while it mitigated plant antioxidant enzyme increases, reduced malondialdehyde and free proline, alleviated membrane damage. Biochar facilitated Pb(II) conversion from exchangeable to organic-bound and residual fractions by enhancing two key factors: pH and SOM, achieving up to 89.04%, thereby reduced stem and leaf Pb accumulation by 25.38-29.45%, yet failed to fully offset Cd activation by microplastics. Wood chip biochar outperformed straw biochar in Pb immobilization and oxidative stress mitigation; both offered limited Cd remediation. This study elucidates the mechanisms by which organic matter hubs and pH govern the regulation of heavy metal speciation, providing a theoretical bases for the targeted remediation of co-contaminated soils.
More Papers Like This
Biochar Offsets Microplastic-Induced Cadmium Mobilization and Plant Accumulation in Contaminated Soils
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This greenhouse study found that microplastics in soil can increase how much cadmium (a toxic heavy metal) is absorbed by crops. Adding biochar to the soil helped counteract this effect, reducing cadmium uptake by plants — a promising finding for protecting food safety in contaminated farmland.
Contrasting responses of soil-microbial-plant systems to co-application of biochar and microplastics with/without additives in acidic versus slightly alkaline heavy metal-affected soils
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Farmland contaminated with both microplastics and heavy metals (like cadmium and lead) is a growing concern, since these toxins can build up in crops we eat. This study found that adding biochar—a charcoal-like soil additive—helped plants grow better and absorb fewer heavy metals in acidic soil, but didn't work as well (and sometimes backfired) in slightly alkaline soil. This matters because it shows that soil cleanup strategies need to be tailored to soil type, rather than assuming one fix works everywhere, which could affect how safe and nutritious our food crops are.
Impact of Microplastics on the Immobilization of Cd in Soil by Biochar
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Biochar is often used to lock toxic cadmium in place in farm soil so it doesn't end up in our food, but this study found that microplastics in the soil can interfere with that process, making cadmium more available for crops to absorb. The effect was worse with higher levels of microplastics, larger plastic particles, and certain plastic types (like polypropylene), suggesting that plastic pollution could be quietly undermining efforts to keep toxic metals out of our food supply.
Micron-engineered biochar mitigates antimony and microplastics toxicity by reshaping soil microbiome and plant transcriptomic responses
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Antimony and microplastic pollution in soil can harm crops and let toxic metals build up in the food we eat. This study found that adding a special engineered charcoal (biochar) to contaminated soil helped rice plants grow better, boosted helpful soil bacteria, and cut the amount of antimony taken up by the plants by nearly a third—meaning less toxic buildup in our food. This suggests biochar could be a simple, affordable tool for making crops safer and more resilient in polluted soils.
Effects of microplastics in soil on the regulation of cadmium bioavailability by biochar
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Researchers investigated how biochar amendments affect cadmium bioavailability in soils co-contaminated with microplastics, finding that the presence of microplastics altered cadmium mobility and complicated biochar's remediation effectiveness in ways that depend on the specific MP type present.
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