ADSORPTION CHARACTERISTICS OF PFCS AND PAHS ON MICROPLASTICS IN LAKE BIWA AND OSAKA BAY

Abstract

 Main objective of this study was to understand the adsorption characteristics of perfluorinated compounds (PFCs) and polycyclic aromatic hydrocarbons (PAHs) on microplastics in Lake Biwa and Osaka Bay. Microplastics (315 μm-5 mm) in surface water were collected and 15 types of PFCs, 16 types of PAHs and 4 types of harogenated PAHs were analyzed simultaneously. Target chemicals on microplastics were found at 49-218 ng/g-dry (Σ15 PFCs), 1,730-27,100 ng/g-dry (Σ16 PAHs) and 29-799 ng/g-dry (Σ4 harogenated PAHs), respectively. It was suggested that each compound was adsorbed on microplastics by hydrophobic effect, because target chemicals' contents ratio (chemical content on microplastics/that in dissolved phase of surface water) increased as their octanol/water partition coefficient (log Kow) increased. In addition, it was assumed that micoroplastics with smaller diameter tended to con-tain more PAHs.