Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (12): 2375.

• Articles • Previous Articles     Next Articles

Effect of Fog Process on the Size Distribution of Polycyclic Aromatic Hydrocarbons in the Atmospheric Aerosol PM10

FAN Shu-Xian1,2*, HUANG Hong-Li2, GU Kai-Hua2, LI Hong-Shuang1, ZHU Bin3, ZHANG Hong-Liang2, FAN Yang2   

  1. 1. Key Laboratory of Meteorological Disaster, Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, China
    2. College of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing 210044, China
    3. Open Key Laboratory for Atmospheric Physics and Environment of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing 210044, China
  • Received:2010-04-14 Revised:2010-05-04 Online:2010-12-10 Published:2010-12-06
  • Contact: FAN Shu-Xian E-mail:shuxianf@nuist.edu.cn
  • About author:樊曙先, 女, 博士, 教授, 从事有机气溶胶污染化学及大气环境化学方面的研究. E-mail: shuxianf@nuist.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 40775012), 江苏省高等学校自然科学重大基础研究项目(批准号: 08KJA170002), 公益性行业(气象)科研专项资金(批准号: GYHY200706026)和国家“九七三”计划预研项目(批准号: 2009CB426313)资助.

Abstract: Fractionating samples of atmospheric aerosol PM10, collected during a fog high frequency period, were determined for 16 priority Polycyclic Aromatic Hydrocarbons (PAHs). Result shows that the average mass concentrations of PM2.1 and PM9.0 in the near surface layer of the fog area increase sufficiently, and the diurnal concentration variation of PM2.1 are changed due to fog process. Before, during and after fog event, the 16 priority Polycyclic Aromatic Hydrocarbons (PAHs) in the PM10 mainly distribute in the fine particles with larger specific surface area, and averagely, 83.04% of PAHs distribute on the aerosol with Dp <2.1μm. During the fog event, the concentrations of ∑16PAHs in the particles (Dp: 1.1~2.1μm) increase remarkably, whereas those in the particles (Dp <0.65μm) decrease slightly; therefore, fog process plays a great role on the distributions of ∑16PAHs in the fine particles. In the daytime before, during and after fog event, the distributions of ∑16PAHs in the accumulation mode have large differences; the peak diameter of accumulation mode shifts to the larger size during the fog event, compared with those before and after fog. In a prolonged fog event, the peak diameter of daytime ∑16PAHs accumulation mode shifts to the larger size continuously and stays at 1.1~2.1μm, while there is no significant variation of peak diameter in the nighttime, all at 1.1~2.1μm; subsiquently, the size distributions of ∑16PAHs in PM10 are greatly affected by the duration of the fog event.

Key words: Polycyclic Aromatic Hydrocarbons, fog event, atmospheric aerosol, PM10, size distribution

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