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Assessing the efficacy and ecological impact of a plastic-dissolving agent on microplastic removal and soil microbial communities
Summary
Scientists tested a chemical product designed to dissolve microplastics in soil, finding it removed up to 81% of certain plastic particles (like polystyrene and PVC) but caused unintended side effects, disrupting soil bacteria and fungi and altering greenhouse gas emissions. This suggests the product could be useful for quick cleanup in heavily polluted areas, but isn't a perfect fix—it may trade one environmental problem (plastic pollution) for another (soil ecosystem damage), so more research is needed before widespread use.
Microplastics (MPs) accumulation in soils, especially at tourist attractions, poses an ecological threat. Remediation technologies are often costly, slow, or disruptive. This study evaluated a commercial plastic-dissolving agent (DA) for the removal of MPs and its impact on soil health. In a 60-day incubation with soil from Yuelu Mountain, we tested conventional (PS, PVC) and biodegradable (PLA) MPs with/without DA, measuring greenhouse gas emissions, soil properties, enzymes, and microbial communities. DA removed 12–81% of MPs depending on polymer type. MPs alone increased CO 2 (16–129%) and N 2 O (315–421%). DA suppressed CO 2 and N 2 O emissions (19–99%) by inhibiting nitrification and labile C mineralization, while activating CH 4 oxidation. DA increased Pseudomonadota (13–26%) and Ascomycota (1–40%), simplified co-occurrence networks, and shifted community assembly towards stochasticity. DA reversed the negative impact of PS but reduced multifunctionality with PLA. DA can effectively remove conventional MPs but at the cost of ecological toxicity. Therefore, DA could be used for emergency removal of PS/PVC in severely contaminated hotspots.