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Microplastics-Mediated Behavior of Potentially Toxic Elements in Plant–Soil Systems: Adsorption, Bioavailability, and Phytotoxicity
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Microplastics in soil don't just sit there, this review of existing research shows they can either trap toxic metals (like cadmium and arsenic) or make them easier for crops to absorb, depending on conditions like soil type and plastic particle size. In some cases, this combo can shrink crop growth by up to 30%, which matters because these are the same toxic metals that can end up in the food we eat, potentially raising long-term health risks.
Microplastics (MPs) and potentially toxic elements (PTEs) increasingly co-occur in agricultural and peri-urban soils, yet their combined effects on adsorption, mobility, bioavailability, and phytotoxicity are highly context-dependent. This review synthesizes plant-soil evidence by focusing on the interacting roles of MP polymer type, particle size and shape, aging/weathering state, soil geochemistry, dissolved organic matter, and rhizosphere processes. Across the reported studies, MP-PTE interactions show several major directions of changes: MPs may reduce PTE lability by promoting adsorption, aggregation, or sequestration within coated surfaces and soil aggregates; conversely, they may increase PTE mobility and plant exposure when reversible binding, dissolved organic ligands, pH shifts, or particle transport deliver labile PTEs to root-active zones. Dose-dependent and biphasic responses are also common, with low MP additions sometimes attenuating stress while higher doses intensify toxicity. Quantitatively, available crop studies show that intensified co-exposure can reduce plant biomass by approximately 10.2-29.3%, depending on crop species, plant organ, MP type, dose, and PTE identity, whereas antagonistic or neutral responses are also reported under other exposure conditions. The strongest evidence currently exists for Cd and As, but this review also considers Pb, Cu, Zn, Ni, Cr, and Hg to represent chemically distinct cationic, metalloid, and redox-sensitive PTEs. Overall, MPs should not be treated only as passive contaminant carriers; they act as dynamic reactivity modifiers that can function as sinks, vectors, or indirect regulators of PTE bioavailability depending on soil and rhizosphere boundary conditions.
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Scientists found that tiny plastic particles in soil make it easier for toxic metals like lead and zinc to move into plants we might eat. Even small amounts of microplastics changed how metals behave in the soil, with some types of plastic causing up to 20% more metal absorption in plants. This matters because these contaminated plants could end up in our food supply, potentially increasing our exposure to harmful metals.
Impact of Co-Contaminants (Microplastics and Others) on Heavy Metal/Metalloid Toxicity and Accumulation in Plants
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This review examines how microplastics act as co-contaminants alongside heavy metals and metalloids in agricultural soils, influencing their toxicity and uptake by plants. Researchers found that the presence of microplastics can alter how metals like cadmium, arsenic, and lead accumulate in plant tissues, with implications for crop safety and agricultural productivity.
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This review examines how microplastics interact with heavy metals and organic pollutants in soil and what that means for plant growth. Researchers found that certain plastic types can increase the availability of toxic metals like cadmium while also affecting how organic chemicals behave in soil. The study suggests that the combined presence of microplastics and other pollutants in agricultural soils may create compounding risks to crop health and food safety.
Microplastics as Source or Sink of Potentially Toxic Elements: Dynamics in the Soil-Plant System
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This review paper summarizes research on how tiny plastic particles in soil can either trap or release toxic metals and chemicals. These microplastics can act like sponges that soak up harmful substances, making them less dangerous, or they can break down and release toxins that plants might absorb. This matters because these toxic substances could eventually end up in our food supply when crops grow in contaminated soil.
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