Characteristics and forming potential of secondary organic aerosols of volatile organic compounds during an air pollution episode in autumn Chengdu
HE Li1, LUO Meng-meng1, PAN Wei1, HAN Li2, CHENG Yan1, CHEN Jun-hui2
1. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610036, China;
2. Sichuan Academy of Environmental Sciences, Chengdu 610041, China
The pollution characteristics and diurnal variation of 77ambient volatile organic compounds (VOCs) were studied by using online gas chromatography mass spectrometry detection systems (GC-FID/MS) during a typical air pollution episode from Oct. 28th to Nov. 9th, 2016 in Chengdu city. The results showed that the averaged concentration of VOCs dramatically increased from 38.9×10-9 before the episode to 143.4×10-9 in the episode. After the episode, the averaged concentration of VOCs was 35.7×10-9. There was no obvious bimodal distribution of VOCs in the pre-pollution period, afterwards the diurnal variation curve of VOCs concentration had a bimodal characteristic, with the two peaks appearing in the rush hours with heavy traffic. The potential formation of secondary organic aerosols (SOA) estimated by fractional aerosol coefficients (FAC) and the SOA concentration values in various stages were 1.1 μg/m3(before the episode)、3.1 μg/m3 (in the episode) and 1.5 μg/m3(after the episode), respectively. Alkanes were found to be the main contributors to the SOA formations.
何丽, 罗萌萌, 潘巍, 韩丽, 程琰, 陈军辉. 成都秋季大气污染过程VOCs特征及SOA生成潜势[J]. 中国环境科学, 2018, 38(8): 2840-2845.
HE Li, LUO Meng-meng, PAN Wei, HAN Li, CHENG Yan, CHEN Jun-hui. Characteristics and forming potential of secondary organic aerosols of volatile organic compounds during an air pollution episode in autumn Chengdu. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(8): 2840-2845.
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