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Systematic review of microplastics and heavy metals co-contamination on soils: The triple-chain effects of soil properties, crop responses, and biological communities
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Researchers reviewed how co-contamination of agricultural soils with microplastics and heavy metals interacts synergistically to exacerbate nutrient deficiencies, increase reactive oxygen species, and stunt plant growth, proposing a three-chain soil-crop-biota framework to reconcile contradictory findings and guide remediation strategies.
Microplastics (MP), due to high specific surface area and chemical activity, can serve as carriers for heavy metals (HM), influencing their speciation, mobility, and toxicity in soil. In recent years, the interaction between MP and HM has become a research hotspot in agricultural soil pollution. Yet, the full ecological consequences of this co-contamination remain poorly defined. This review offers an in-depth analysis of how the co-occurrence of MP and HM affects the health of agricultural soils. We begin by exploring changes to key physicochemical properties, and examining biological repercussions. The dual stressors of MP and HM have been shown to interact synergistically, exacerbating nutrient deficiencies in plants, increasing the generation of reactive oxygen species, and stunting growth, which together undermine both yield and produce quality. By embedding the evidence into a three-chain framework (soil-crop-biota), this review reconciles contradictory outcomes (synergistic vs. antagonistic) and translates mechanisms into indicators and governance options.
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Researchers examined how micro- and nanoplastics interact with heavy metals in soil, finding that plastics can alter metal mobility, bioavailability, and toxicity through adsorption and chemical reactions, raising concern that plastic pollution may worsen the risk posed by existing heavy metal contamination in agricultural and urban soils.
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Researchers reviewed a decade of studies on microplastic contamination in soil and found that microplastics alter soil chemistry and biology in complex ways depending on plastic type and concentration, with impacts expected to worsen as global plastic production continues to rise.
Navigating The Hidden Crisis: Microplastics And Heavy Metals in Soil- Transport, Impact, and Remediation
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Tiny plastic bits in soil don't just sit there, this review of existing research shows they can team up with toxic heavy metals already in the ground, making those metals up to 30-50% more likely to leach out and get absorbed by crops. That matters because it means the food grown in contaminated soil could carry more heavy metal contamination than previously thought, though scientists still need more real-world data to fully understand the risk to people who eat those crops.
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