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Effects of arsenic on the transport and attachment of microplastics in porous media
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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.
Understanding the impact of arsenic (As(III), inorganic pollutant widely present in natural environments) on microplastics (MPs, one type of emerging contaminants) mobility is essential to predict MPs fate and distribution in soil-groundwater systems, yet relevant research is lacking. This study explored the effects of As(III) copresent in suspensions (0.05, 0.5, and 5 mg/L) on MPs transport/attachment behaviors in porous media containing varied water contents (θ = 100 %, 90 %, and 60 %) under different ionic strengths (5, 10, and 50 mM NaCl) and flow rates (2, 4, and 8 m/day). Despite solution ionic strengths, flow rates, porous media water contents, sizes, and surface charges of MPs, with coexisting humic acid, and in actual water samples, As(III) of three concentrations increased MPs transport in quartz sand and natural sandy soil. The increased electrostatic repulsion between MPs and sand caused by the altered MPs surface charge via the adsorption of As(III) together with steric repulsion from As(III) in solution contributed to the promoted MPs mobility in porous media. The occupying attachment sites by As(III) partially contributed to the increased mobility of MPs with negative surface charge in porous media. Clearly, As(III) coexisting in suspensions would enhance MPs transport in porous media, increasing MPs environment risks.
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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.
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