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Physicochemical properties of environmental media can affect the adsorption of arsenic (As) by microplastics
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Researchers found that microplastics in farmland soil can absorb arsenic, a known carcinogen, and that the amount absorbed depends on soil properties like organic matter content and nutrient levels. This is the first study to examine microplastic-arsenic interactions in natural soil conditions across 12 Chinese provinces. The findings are important for human health because microplastics carrying arsenic in agricultural soil could increase the transfer of this toxic element into food crops.
Microplastics are emerging pollutants that can adsorb heavy metals and threaten human health through food chain. Recently, there has been increasing interest in understanding the adsorption behavior of heavy metals by microplastics in farmland soil. In particular, arsenic (As), as a carcinogen, has the potential to be adsorbed by soil microplastics. However, the mechanisms and controlling factors of As adsorption by microplastics in farmland soil under natural conditions are still unknown. Here, microplastics and As were respectively added to farmland soils with different physicochemical properties from twelve provinces of China for adsorption experiment. We performed surface analysis of microplastics, quantified As accumulation through quasi-first-order kinetic equation and developed regression models to screen the factors controlling As adsorption. The results showed that the adsorption of As by soil microplastics was a chemical process accompanied by the loss of electrons from oxygen-containing functional groups. Soil cation exchange capacity (CEC) was the main factor controlling the adsorption rate, while soil organic matter (SOM), total nitrogen (TN) and CEC mainly influenced the equilibrium adsorption capacity. This is the first report on microplastic-As adsorption in natural soil, which allows deeper insights into risk assessment, prediction and control of microplastic-As pollution in agricultural soil.
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Researchers studied how arsenic, a common groundwater contaminant, affects the movement of microplastics through soil. They found that arsenic in water generally reduced how far microplastics traveled by promoting their attachment to soil particles, though this effect depended on arsenic concentration, water flow speed, and soil moisture levels. The findings help predict how microplastics and heavy metals may interact and spread together in underground water systems.
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Researchers found that both biodegradable PLA and non-biodegradable polyethylene mulching film microplastics alter arsenic transport in agricultural soil, with photo-aging changing their adsorption capacity and potentially affecting arsenic mobility and ecological risk.
Contrasting roles of soil aggregates in decoupling solid-phase available As from water-phase risk under microplastic disturbance
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Scientists found that microplastics in soil can make arsenic look "safer" by locking it into soil particles, even while actually pushing more arsenic into water that drains through the ground. This matters because standard soil tests might miss real contamination risks, meaning farmland exposed to microplastic pollution could be leaking more arsenic into water supplies than current safety checks would suggest.
Effects of Microplastics on the Transport of Soil Dissolved Organic Matter in the Loess Plateau of China
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This study examined how polypropylene microplastics affect the movement of dissolved organic matter through agricultural soil in China and found that microplastics can adsorb soil nutrients like phosphorus and ammonium. While this retention might seem beneficial, it alters the natural nutrient cycling that crops depend on. The findings suggest that microplastic accumulation in farmland could gradually change soil chemistry in ways that affect food production.
Mechanistic insight into interactive effect of microplastics and arsenic on growth of rice (Oryza sativa L.) and soil health indicators
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Researchers tested how different types of microplastics interact with arsenic contamination in rice paddy soil, finding that biodegradable PLA microplastics actually increased arsenic uptake by rice plants by up to 39%. In contrast, conventional polyethylene microplastics slightly reduced arsenic absorption. This is an important finding because as agriculture shifts toward biodegradable plastics, they may inadvertently increase the transfer of toxic heavy metals from soil into food crops.
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