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The microplastics in the surface seawater at 23 fixed points in the southwestern waters of Jeju Island were analyzed to conduct a study on the distribution characteristics of microplastics. The abundance of microplastics was shown to be 0.17 ~ 1.37 (average 0.46) n/L, the materials were mainly PP and PE, and the shape of fragments was dominant in the 0.02–0.3 mm group in terms of sizes and shapes. Alkyd and polyester were dominant in the shape of fibers in the 1.0–5.0 mm group. The correlations between the abundance of microplastics, water temperatures, and salinity were compared and as a result, water temperatures, PE, and the 0.02–0.3 mm size group, and the shape of fragments showed negative correlations. Therefore, it is judged that the for PE, which are in the form of 0.02 ~ 0.3 mm fragments to flow into the study area through the Yellow Sea coastal current and the Korean coastal current that show tendencies of relatively low water temperatures. However, since salinity and PP and polyester showed positive correlations, it is judged the possibility for polyester, which are in the form of 1.0 ~ 5.0 mm fibers, to flow into the study area through the Taiwan warm current and Tsushima warm current. In conclusion, it could be judged that in the complex open waters where continental and oceanic waters intersect, the sources of inflow may be different depending on the components of microplastics.

This study determined the PAH contamination variations in the subtidal surface sediment with oil fingerprinting in the Wu Yi San oil spill in Yeosu, Korea, in January 2014. The ∑16 PAHs and ∑alkyl PAHs were investigated in surface sediment and seawater 1 month after the oil spill for 1 year at 3-month intervals in the accident (St. A-F) and adjacent areas (St. 1-20). The averaged ∑16 PAHs and ∑alkyl PAH concentration in the five samplings were 42.2–171.7 ng/g and 211.5–221.8 ng/g, respectively. Comparing the PAH levels in St.E and St.17 indicated a decreased tendency, from 357.9 to 31.1 ng/g dw. in ∑16 PAHs, and from 1900.9 to 211.5 ng/g dw. in ∑alkyl PAHs. The PAHs were not statically correlated between surface sediment and seawater (p > 0.05), implying that the fate of PAHs was rapidly dispersed toward adjacent coasts and beaches. Pyrogenic origin was predominant in 16 PAHs, and petrogenic origin in alkylated PAHs. Notably, C2-D/C2-P and C3-D/C3-P ratios in the accident area during the first sampling were similar to accident oil, but the similarity was not shown in other samplings. Only the C2-naphthalene (St.A), C1-phenanthrene (St.A and St.B), and C2-phenanthrene (the entire accident area points) concentrations were higher than the ERL SQG.