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Critical role of dissolved and particulate phosphorus in controlling the fate of polystyrene nanoplastics in porous media
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Researchers showed that positively charged polystyrene nanoplastics aggregate in the presence of plant root exudates and soil leachate while negatively charged nanoplastics remain stable and mobile, driven by organic acid adsorption onto nanoparticle surfaces. Understanding nanoplastic charge-dependent behavior in soil-root systems is crucial for assessing how nanoplastics are taken up by crops and may enter the human food supply.
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Laboratory column experiments showed that iron oxyhydroxide surface charge in porous media is a primary control on nanoplastic mobility, with positively charged surfaces trapping negatively charged polystyrene nanoparticles and negatively charged surfaces allowing free transport. Understanding these transport mechanisms in aquifers and sediments is essential for predicting how long nanoplastics persist and where they accumulate in groundwater environments.
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