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Microplastics and Potentially Toxic Elements: Potential Human Exposure Pathways through Agricultural Lands and Policy Based Countermeasures
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This review examines how microplastics interact with potentially toxic elements in agricultural soils and the resulting human exposure pathways. Researchers found that microplastics can adsorb heavy metals and other contaminants, enhancing their transport through soil and into crops. The study outlines policy-based countermeasures needed to address the combined risks of microplastic and heavy metal contamination in food production systems.
Microplastics (MPs) have been identified as an emerging soil pollutant and a global environmental concern. Scientists have recently paid attention to the contamination of soil by MPs as their detrimental impacts on soil systems are largely unknown. MPs are considered to be vectors for other soil contaminants, such as potentially toxic elements (PTEs) and organic contaminants. PTEs are persistent contaminants and are often released into soils in large quantities. MPs adsorb PTEs, mainly via electrostatic attraction and surface complexation, and increase their mobility in soils. These complexes can be easily absorbed by plants; hence, the accumulation of PTEs in plants can be enhanced in both microplastic and PTE contaminated soils. Furthermore, there is a high risk of food chains contamination by PTEs due to crops grown in both microplastic and PTE-contaminated soils. Consequently, countermeasures including policy- and governance-based approaches that target circular economy as well as reduce, reuse, recycle (3R) applications are being discussed around the world to minimize the environmental contamination of MPs.
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This review summarizes how microplastics and heavy metals interact in soil, where microplastics can absorb and carry toxic metals through the food chain and into the human body. Aging and weathering of microplastics changes their surface properties, making them better at picking up heavy metals, which raises concerns about combined exposure through contaminated crops and water.
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This review examines how microplastics contaminate agricultural soil through plastic mulch, irrigation water, and fertilizers, then alter soil chemistry, harm beneficial microorganisms, and reduce crop productivity. The authors highlight that microplastics can accumulate in crops and enter the human food chain, posing risks to food safety and human health, particularly through daily food and water consumption.
Microplastics and potentially toxic elements: A review of interactions, fate and bioavailability in the environment
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This review summarizes how microplastics interact with toxic metals in the environment, finding that microplastics absorb and transport metals through soil and water via processes like electrostatic attraction and surface bonding. When organisms consume microplastics carrying toxic metals, they can experience greater harm than from either pollutant alone. This combined threat is relevant to human health because contaminated microplastics in the food chain could deliver concentrated doses of toxic metals to people through food and water.
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