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Adsorption Characteristics of Pfcs and Pahs on Microplastics in Lake Biwa and Osaka Bay
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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.
本研究では，琵琶湖・大阪湾におけるマイクロプラスチックへのペルフルオロ化合物類（PFCs）および多環芳香族炭化水素類（PAHs）の吸着特性を検討することを主目的とした．表層水中の粒径315 μm～5 mmのマイクロプラスチックを対象としてPFCs 15種，PAHs 16種および塩素化PAHs 4種の同時分析を行った．マイクロプラスチック中の含有量は，Σ15 PFCsが49～218 ng/g-dry，Σ16 PAHsが 1,730～27,100 ng/g-dry，Σ4塩素化PAHsが29～799 ng/g-dryであった．PFCsおよびPAHsの各物質におけるマイクロプラスチックと溶存態の濃度比は，オクタノール/水分配係数（Log Kow）が大きくなるにつれて，増加傾向であり，疎水性吸着である可能性が示唆された．さらに，マイクロプラスチックの単位重量あたりのPAHs含有量は，粒径が小さくなるにつれて，増加する傾向が推察された．
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