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Adsorption Characteristics of Micropollutants on Microplastics by Focusing on Their Diameters in Water Environment
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This study examines the adsorption characteristics of micropollutants including perfluoroalkyl acids (PFAAs), polycyclic aromatic hydrocarbons (PAHs), and their halogenated derivatives onto microplastics of varying diameters in aquatic environments, finding that smaller particle sizes adsorb greater quantities per unit weight.
近年，水環境中のマイクロプラスチック（MPs）を輸送媒体とした微量有機汚染物質の水生生物への悪影響が問題視されている．本研究では水環境中におけるペルフルオロアルキル酸類（PFAAs）および多環芳香族炭化水素類（PAHs）とそのハロゲン化体類（X-PAHs）のMPsへの吸着特性の検討を主目的とした．特にMPsの粒径に着目し，1）MPs標準品を用いた吸着試験，2）2017年10~11月に琵琶湖・大阪湾における表層水中のMPsへの微量有機汚染物質の吸着量の存在実態の調査を行った．MPsの粒径が小さくなるにつれて，単位重量あたりのPFAAs, PAHs, X-PAHsの吸着量が多くなる傾向が示され，粒径数十μmのMPsでは浮遊物質より吸着量が多くなる可能性が示唆された．また，環境中の作用によりMPsが劣化し表面積が大きくなると，PFAAs, PAHsの吸着量がさらに増加することが予想された．
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Researchers analyzed microplastics collected from Lake Biwa and Osaka Bay in Japan for the presence of perfluorinated compounds (PFCs) and polycyclic aromatic hydrocarbons (PAHs), finding that smaller microplastic particles tended to carry higher concentrations of these toxic chemicals. The results suggest that hydrophobic adsorption drives contaminant uptake, raising concerns about microplastics acting as vectors for hazardous pollutants.
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Researchers studied how perfluoroalkyl substances (PFAS), a group of persistent industrial chemicals, bind to polyamide microplastics in water. They found that smaller microplastic particles absorbed dramatically more PFAS than larger ones, and that water chemistry conditions like pH and salinity influenced the process. The findings suggest microplastics can concentrate harmful chemicals and potentially increase human and wildlife exposure to PFAS in contaminated environments.
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Researchers investigated how two widely detected PFAS compounds, PFOS and PFOA, adsorb onto five common types of microplastics in aquatic environments. The study found that contaminant properties and water chemistry significantly influence adsorption behavior, confirming that microplastics can serve as carriers for PFAS transport in waterways.
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