Gas-particle partitioning and behavior of dioxin-like PCBs in the urban atmosphere of Gyeonggi-do, South Korea

作者：Kim Dong Gi; Choi Ki In; Lee Dong Hoon^*

来源：Atmospheric Research, 2011, 101(1-2): 386-395.

DOI：10.1016/j.atmosres.2011.03.010

• dl-PCBs
• Partitioning
• Particle bound fraction
• Junge-Pankow model
• K(OA)-based model

To evaluate their behavior and gas-particle partitioning, the concentrations of dioxin-like polychlorinated biphenyls (dl-PCBs) in both gas and particle phases in ambient air were measured at urban sites in Gyeonggi-do, South Korea. The predominance of gas-phase PCBs in the atmosphere was more significant during summer at all sites. In July, approximately 92% of the total toxic equivalent quantity (TEQ) was in the gaseous phase, whereas in January, approximately 96% of the total TEQ was in the particle phase. The dl-PCBs can be transported over long ranges and accumulate rapidly in plants at warm temperatures. Partial vapor pressures of dl-PCBs were well correlated with temperature and the steep slopes obtained from Clausius-Clapeyron plots indicated that the volatilization of dl-PCBs from surfaces in the local surroundings of the sampling sites dominated the atmospheric concentrations.
The gas-particle distribution was also examined through several different approaches such as the log K(P)-log P(L)(O), log K(P)-log K(OA), Junge-Pankow, and K(OA)-based models. The slopes obtained from regressing log K(P) versus log P(L)(O) (log K(P) versus log K(OA)) were smaller than - 1 (or 1). The particle-bound fraction (phi) and K(P) of the dl-PCB congeners were estimated using the Junge-Pankow and K(OA)-based models. Both models tended to overestimate the phi and K(P) values of the dl-PCB congeners compared to those obtained from field measurements. Nevertheless, the coefficients of determination (r(2)) between the experimental and modeled K(P) values were 0.74 to 0.84 and 0.76 to 0.84 for the Junge-Pankow and K(OA)-based models, respectively.

• 出版日期2011-7
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