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The bioaccumulation and ecotoxicity of co-exposure of per(poly)fluoroalkyl substances and polystyrene microplastics to Eichhornia crassipes
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This study found that when microplastics and forever chemicals (PFAS) coexist in water, the microplastics increase how much PFAS accumulates in water hyacinth plants and worsen the toxic effects compared to PFAS exposure alone. The finding is relevant to human health because it shows microplastics can amplify the harmful effects of other pollutants already present in the environment.
Gen X and F-53B have been popularized as alternatives to PFOA and PFOS, respectively. These per(poly)fluoroalkyl substances pervasively coexist with microplastics (MPs) in aquatic environments. However, there are knowledge gaps regarding their potential eco-environmental risks. In this study, a typical free-floating macrophyte, Eichhornia crassipes (E. crassipes), was selected for hydroponic simulation of a single exposure to PFOA, PFOS, Gen X, and F-53B, and co-exposure with polystyrene (PS) microspheres. F-53B exhibited the highest bioaccumulation followed by Gen X, PFOA, and PFOS. In the presence of PS MPs, the bioavailabilities of the four PFASs shifted and the whole plant bioconcentration factors improved. All four PFASs induced severe lipid peroxidation, which was exacerbated by PS MPs. The highest integrated biomarker response (IBR) was observed for E. crassipes (IBR of shoot: 30.01, IBR of root: 22.79, and IBR of whole plant: 34.96) co-exposed to PS MPs and F-53B. The effect addition index (EAI) model revealed that PS MPs showed antagonistic toxicity with PFOA and PFOS (EAI < 0) and synergistic toxicity with Gen X and F-53B (EAI > 0). These results are helpful to compare the eco-environmental impacts of legacy and alternative PFASs for renewal process of PFAS consumption and provide toxicological, botanical, and ecoengineering insights under co-contamination with MPs.
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This study examined how mixtures of different microplastic types interact with PFAS (forever chemicals) and found that more diverse microplastic mixtures increased the absorption and toxicity of PFAS in aquatic plants. The complexity of real-world microplastic pollution, where multiple plastic types coexist, appears to make forever chemical contamination worse. This finding is important because most lab studies test single plastic types, potentially underestimating the actual environmental risk.
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Scientists studied how microplastics and "forever chemicals" (PFAS) together affect water hyacinth plants used to clean up polluted water, finding that the mix of plastic types disrupts the helpful bacteria and fungi living on plant roots, which in turn affects how well the plants remove pollutants from water. This matters because floating plants like these are used in real-world water treatment systems, and understanding how combined plastic and PFAS pollution weakens their cleanup power could help us design better, more effective ways to filter contaminants out of drinking water sources.
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Researchers studied how the combined presence of microplastics and PFAS chemicals affects the bacterial communities living on water hyacinth roots. They found that these pollutants significantly altered the composition and diversity of root-associated bacteria, with different plastic types and chemical combinations producing distinct microbial shifts. The findings suggest that co-contamination by microplastics and PFAS could disrupt the beneficial microbial communities that aquatic plants depend on for healthy growth.
Microplastics as carriers of per- and polyfluoroalkyl substances (PFAS) in aquatic environment: interactions and ecotoxicological effects
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Researchers reviewed how microplastics serve as carriers for per- and polyfluoroalkyl substances (PFAS), sometimes called forever chemicals, in aquatic environments. The study found that PFAS can attach to microplastic surfaces and accumulate in organisms through the food chain, potentially amplifying the toxic effects of both pollutants. The findings suggest that the combined presence of microplastics and PFAS poses a greater environmental and health risk than either pollutant alone.
Microplastic co-exposure increases PFAS bioaccumulation without universally amplifying toxicity in aquatic organisms: A multi-endpoint meta-analysis
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Scientists found that microplastics and "forever chemicals" (PFAS) often build up together in water animals, with microplastics helping PFAS accumulate more in their bodies. But this didn't always mean worse health effects: some issues like nerve damage and digestion problems got worse, while others like reproduction and hormone effects didn't change, showing that risk depends on the specific chemical and situation, not one blanket rule.
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