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Palygorskite Reducing Cd Accumulation in Lettuce (lactura Sativa L.) and Remediating Soil Contaminated with Both Cadmium and Microplastics
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Researchers found that microplastics in soil increase the uptake of toxic cadmium into lettuce plants, but adding palygorskite — a natural clay mineral — reduced cadmium availability in the soil and its accumulation in lettuce by up to 54%, offering a promising natural remedy for soils contaminated with both microplastics and heavy metals.
Microplastics (MPs) increase the available state of cadmium (Cd) in soil, which could seriously threaten the safe production of lettuce (Lactura sativa L.).Palygorskite (PAL) can potentially improve MPs-Cd co-contaminated soil, but the mechanism is unclear.PAL (2%, 4%) and MPs (0.1%, 1%) were mixed into soils with different levels of Cd pollution.After 30 days, the bioavailability of Cd and soil physical and chemical properties were determined.The dry weight of lettuce and the concentration of Cd in the shoot and root parts of lettuce were determined.The results showed that MPs hurt the growth of lettuce and increased the Cd accumulation in plant.The content of available Cd in soil was also increased.PAL could increase the lettuce biomass of the shoot and root part by 2.46%-40.64%and 2.75%-36.25%,respectively.Soil bioavailable Cd decreased by 14.15%-53.85%.Cd content in the shoot and root part of lettuce decreased by 6.12%-27.29%and 2.36%-44.90%,respectively.Regression path analysis (RPA) showed that PAL reduced the accumulation of Cd in plants and promoted the growth of lettuce by changing the properties of MPs-Cd co-contaminated soil.This study provides a new perspective for the remediation of MP-Cd co-contaminated soil with natural clay minerals.
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This study found that polyethylene microplastics in soil increased the amount of cadmium, a toxic heavy metal, that lettuce plants absorbed. The microplastics changed soil chemistry by lowering pH and increasing dissolved organic carbon, which made cadmium more available for plant uptake. This is concerning because it suggests that microplastics in agricultural soil could make crops more contaminated with heavy metals, increasing the health risks for people who eat them.
[Effects of Microplastics Coexisting in Vegetable Soil on the Change of Cadmium Bioavailability].
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Researchers investigated the effects of biodegradable microplastics co-occurring with cadmium in vegetable soil through a 60-day pot experiment with lettuce, examining how the combined contamination alters cadmium bioavailability and uptake relative to cadmium-only or microplastic-only conditions.
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Researchers studied how polyethylene microplastics interact with cadmium contamination in soil and its effects on lettuce growth. The study found that microplastics combined with cadmium significantly decreased soil quality and that microplastics can alter cadmium uptake in plants, suggesting that co-contamination of agricultural soils with both pollutants may pose compounded risks to food crop safety.
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Researchers studied the combined effects of polystyrene microplastics and cadmium contamination on soil properties and lettuce growth. The study found that the co-presence of microplastics and heavy metals altered soil physicochemical characteristics and affected plant physiological responses, indicating that compound contamination from microplastics and metals may pose greater risks to agricultural systems than either pollutant alone.
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Researchers studied how naturally aged microplastics in soil affect the uptake of arsenic and cadmium by lettuce. At low concentrations, microplastics actually reduced heavy metal absorption and helped plant growth, but at higher concentrations they increased the amount of toxic metals taken up by the lettuce. This means microplastic-contaminated farmland could lead to higher levels of heavy metals in salad greens and other vegetables that people eat.
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