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(42-02) Accumulation of polychlorinated biphenyls in fishes and frogs from wetlands in S.Korea. Jeong, Gi*,1, Kim, Hyun1, Kim, Young1, Lee, Sung1, Moon, Ji1, 1 Kumjeong-gu Jangjeon-dong San-30, Pusan, S.Korea ABSTRACT- There are two well-known wetlands in S.Korea named Woopo and Joonam. We collected Carassius auratus, Zacco platypus, Hemiculter eigenmanni, Opsariichthys bidens, Rana catesbeiana, and Rana nigromaculata from the above two wetlands and determined concentrations of individual 62 PCB congeners. These wetlands are located in the vicinity of the Nakdong River. Another site along this river, Namji, located between the wetlands along the river is selected to compare the distribution patterns of PCBs with those observed from the wetlands. Only muscles were separated, homogenized, freeze-dried, and then Soxhlet extracted before analysis. A GC/MSD system was applied for identification and quantification of PCBs. Fishes from wetland and river sites showed cleary different distribution patterns, whereas very similar patterns were observed from both wetlands. Frogs, however, showed much similar distribution patterns from all the three collecting sites. Tetra- to hepa-CBs occupied more than 75% of total PCBs except Carassius auratus in which lower chlorinated CBs occupied about 50% of total PCBs. Rana nigromaculata showed much higher levels of total PCBs but much smaller number of congeners than Rana catesbeiana. The highest level of total PCBs was observed in Opsariichthys bidens, 53.2 ng/g wet weight, and followed by Carassius auratus, maximum 6.03 ng/g; Hemiculter eigenmanni, 2.05 ng/g; Rana catesbeiana, 0.566 ng/g; Zacco platypus, 0.465 ng/g; and Rana nigromaculata, maximum 0.139 ng/g. All the species investigated showed higher PCB levels at Joonam compared with Woopo, however, lower concentration of PCBs were observed at both wetlands than those at Namji located along the Nakdong River. This observation may imply that the water quality at wetland is less dependent on the wastes discharged into river water. Key words: polychlorinated biphenyls, wetland, fish, frog |
