남해지역 대기 중 다이옥신류, PAHs 등 유해대기오염물질(HAPs)의 농도 분포 및 가스-입자상 분배 특성에 관한 연구

Abstract

This study was performed to investigate the concentration level, patterns, characteristic of gas-particle partitioning and scavenging effect by precipitation of PCDD/DFs, PCBs, PAHs and VOCs in the ambient air in southern Korea from January to April in 2010. The average concentration of PCDD/DFs isomers ranged from 1.11 to 1.46pg/m3, 2,3,7,8-substituted congeners of PCDD/DFs were from 0.46 to 0.62pg/m3. Total PCBs and DL-PCBs ranged from 291.29 to 369.48pg/m3, and from 0.01 to 0.30pg/m3, respectively. PAHs were varied from 16.81∼33.32ng/m3. VOCs compounds were from 39.77 to 57.82ng/L. These results were lower level than previous studies and the concentration of PCDD/DFs was also lower than the domestic standardization. The concentration levels and profile pattern of PCDD/DFs, PCBs, PAHs and VOCs were observed similarly with general ambient pattern from January to March that is non-precipitation period. The results of gas-particle partitioning concentrations showed that PCDD/DFs, PCBs isomers and PAHs compounds having low molecular weight are dominant for gas phase concentration. On the contrary, other isomers and compounds having high molecular weight are predominant for particle phase. The result from this study was applied to Junge-Pankow model. As a result from model analysis, 4 sampling sites in this study were similar with the properties of rural region. PCDD/DFs, PCBs, PAHs, VOCs and semi organic compounds in the ambient air exist on both gas phase and particle phase during non-precipitation period. Especially, low chlorinated isomers and molecular weight compounds are dominant in the gas phase. However, high chlorinated isomers and molecular weight compounds are predominant in the particle phase. In the case of rainfall, high chlorinated isomers and high molecular weight compounds tending to be absorbed into particles easily were washed out from the ambient air. According to this washout effect, result from this study showed that the ratio of gas phase in the ambient air is predominant after precipitation.