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Size-dependent promotion effect of carbon materials on pak choi growth and suppression on di-(2-ethylhexyl) phthalate accumulation
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Scientists found that adding tiny carbon particles (similar to charcoal) to farmland soil contaminated with DEHP—a common plastic chemical linked to hormone disruption—helped pak choi (a leafy vegetable) grow much bigger while cutting the amount of this chemical absorbed into its edible leaves by 65%. This matters because it offers a simple, low-cost way to grow safer vegetables on soil affected by plastic pollution, potentially reducing our dietary exposure to harmful plastic-related chemicals without disturbing the soil's natural microbial health.
• Size-dependent effect of carbon materials on pak choi growth and DEHP accumulation • The micron-sized carbon material at 500 mg kg⁻¹ significantly enhanced pak choi growth • The micron-sized carbon material markedly suppressed DEHP uptake by pak choi • Micro-nano carbon materials did not induce significant shifts in soil microbial community The safe and efficient utilization of phthalate-contaminated farmland soils has emerged as a critical scientific and technological challenge, particularly in regions with high plastic consumption. Carbon-based materials, owing to their favorable structural and physicochemical properties, have shown promising potential for soil remediation. However, the influence of particle size and application rate of carbon materials on the migration and transformation behavior of phthalates in the soil-plant system remains poorly understood. This study investigated the regulatory effects of micro-nano carbon materials with varying particle sizes and application rates on the growth of pak choi ( Brassica rapa var. chinensis ) and its uptake and accumulation of di-(2-ethylhexyl) phthalate (DEHP). The dissipation of DEHP in soil and associated changes in microbial community structure was also explored. The results demonstrate that the impact of micro/nano carbon materials on both soil DEHP dissipation and plant uptake were highly dependent on particle size and concentration. Application of micron-sized carbon material at 500 mg kg⁻¹ significantly suppressed DEHP dissipation in soil, while simultaneously enhancing plant height, root fresh weight, and shoot fresh weight of pak choi by 0.68, 5.6, and 4.9-fold, respectively. Furthermore, the micron-sized carbon material markedly suppressed DEHP uptake by the shoots of pak choi, reducing DEHP content in shoots by 65%, thereby effectively mitigating the associated dietary health risks. Notably, the addition of micro-nano carbon materials did not induce significant shifts in soil microbial community structure. This study provides a feasible technical strategy and theoretical foundation for the safe utilization of phthalate-contaminated farmland using micro-nano carbon materials.
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Researchers compared the effects of conventional polyethylene and biodegradable polylactic acid microplastics on pakchoi (a leafy vegetable) and found that both types harmed plant growth and disrupted soil bacteria. Adding biochar to the soil helped reduce these negative effects, suggesting it could be a practical way to protect crops from microplastic contamination in agricultural settings.
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Scientists tested how tiny plastic particles (microplastics) in soil affect radish growth, and found the results depend heavily on both the type of plastic and the type of soil. Surprisingly, one common plastic (polystyrene, used in foam packaging) actually boosted plant growth in rich, dark soil by improving soil structure, while other plastics (like PVC and the plastic used in pipes and bottles) had no effect at all. This matters because it shows microplastic pollution isn't uniformly harmful to crops, but it also means these plastics are being absorbed into soil systems in complex ways we don't fully understand yet
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Researchers found that "biodegradable" plastic particles in soil can actually harm cucumber seedlings by disrupting soil nutrients — with one type (called PCL) causing the most damage. This matters because it suggests that switching to biodegradable plastics isn't automatically a safe fix for plastic pollution, and it raises questions about how microplastics in farm soil could affect the food crops we eat.
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