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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.
Microplastics (MPs) and heavy metals (HMs) have emerged as significant environmental pollutants due to their persistence and potential risks to ecosystems, biodiversity and human health. In terrestrial soil systems, the combined presence of MPs and HMs can alter soil chemistry, reduce agricultural productivity and disrupt microbial communities. Despite increasing research on MPs in soil, significant knowledge gaps remain regarding their long-term interactions with HMs and their cumulative effects on agricultural ecosystems. This review critically examines the fate, transport mechanisms and coupled effects of MPs and HMs in soil environments, with a particular focus on agricultural systems. The study comprehensively summarizes the existing literature to address the following key aspects: (i) the fate and behavior of MPs and HMs in agricultural soil systems, (ii) transport mechanisms affecting their mobility and bioavailability, (iii) the interactive effects of MPs and HMs on soil health and ecology, and (iv) potential remediation strategies to mitigate their effects. The analysis shows that MPs significantly alter the adsorption-desorption dynamics of HMs, often increasing their mobility and bioavailability. Quantitative results suggest that MPs can enhance the leaching of HMs by up to 30–50%, thereby increasing their potential uptake by plants. In contrast to previous reviews, this study highlights the lack of empirical data on the interactions between MPs and HMs under real field conditions and argues for advanced monitoring techniques and mechanistic studies. Furthermore, the study emphasizes the need for sustainable prevention strategies, including improved waste management practices and biodegradable alternatives to conventional plastics. By identifying critical research gaps, this study aims to guide future investigations to develop holistic strategies and sustainable remediation approaches to mitigate the risks posed by MPs and HM in terrestrial ecosystems.
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A comprehensive literature review found that soil microplastic research lags far behind aquatic studies despite annual MP discharge into farmland exceeding marine inputs, with synthetic textiles, tire wear, and urban dust as dominant sources entering soil via atmospheric deposition, sewage irrigation, and agricultural film use. The soil MP burden threatens food crop health, risks leaching into groundwater, and poses intergenerational health risks through nutrient disruption and potential plant-to-human transmission pathways.
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Researchers reviewed the emerging problem of microplastic pollution in soil, tracing contamination to agricultural practices, industrial activities, and atmospheric deposition, and examining downstream risks to ecosystem health and human well-being.
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Researchers surveyed the sources, ecological impacts, and remediation strategies for microplastic contamination in soil, revealing that agricultural practices, plastic mulch, sewage sludge application, and atmospheric deposition are primary pathways loading microplastics into terrestrial ecosystems. Soil microplastics threaten plant health, soil microbiome function, and food security while serving as a vector carrying toxic additives and pathogens up the food chain to humans.
Microplastics in Terrestrial Soils: Occurrence, Analysis, and Remediation
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Researchers reviewed how microplastics from synthetic polymers have spread throughout terrestrial soils globally, examining detection methods and emerging remediation strategies for a pollutant that now persists in farmlands and natural soils alike.
Microplastics as Emerging Contaminants: Unraveling Their Impact on Soil Health
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This review pulls together existing research showing how tiny plastic bits in soil mess with its structure, chemistry, and the microbes that keep it healthy, making it harder for plants to grow and absorb nutrients properly. This matters because these plastics can travel from soil into the crops we eat, and the damage to soil health could shrink crop yields over time, raising concerns about both food safety and food supply.
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