Abstract：In order to study the gas-particle partitioning of polychlorinated biphenyls (PCBs) in ambient air of Xi’an City, China, both gas and particle phases samples were collected using an active air sampler on a weekly base during spring in 2012. The results showed that the total concentration (gas plus particle phases) of PCBs ranged from 62.05 to 454.18 pg/m3, with much higher concentration in gas phase than that in particle phase. The steep slope (-5193.24) obtained from Clausius-Clapeyron equation indicated that PCBs concentration in Xi’an City was mainly influenced by the evaporation from adjacent land surface. Gas-particle partitioning coefficients (KP) of PCBs were well correlated with the sub-cooled vapor pressure (PoL) however, the slopes (-0.46~-0.37) obtained from linear regression between logKP and logPoL were shallower than the theoretical value of -1 at equilibrium condition. The results indicated that partitioning of PCBs between the gas and particle phases in the air in Xi’an City was under non-equilibrium condition. The particle bound fraction (φ) and KP value were estimated using the Junge-Pankow adsorption model and Harner-Bidleman absorption model, the result showed that gas-particle partitioning of PCBs was well simulated by both models, however, both models tended to overestimate the values of φ and KP compared with those obtained from field measurement.
韩德明, 叶磊, 张承中, 李文龙, 马万里, 李一凡. 西安城区大气中多氯联苯的气粒分配研究[J]. 中国环境科学, 2014, 34(10): 2466-2471.
HAN De-Ming, YE Lei, ZHANG Cheng-Zhong, LI Wen-Long, MA Wan-Li, LI Yi-Fan. Gas-particle partitioning of polychlorinated biphenyls in air of Xi’an City. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(10): 2466-2471.
