成都秋季大气污染过程VOCs特征及SOA生成潜势

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Abstract

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.

Key words： volatile organic compounds (VOCs) pollution characteristics diurnal variation secondary organic aerosol (SOA)

Received: 08 January 2018

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	Articles by authors
	HE Li
	LUO Meng-meng
	PAN Wei
	HAN Li
	CHENG Yan
	CHEN Jun-hui

Cite this article:

HE Li,LUO Meng-meng,PAN Wei等. Characteristics and forming potential of secondary organic aerosols of volatile organic compounds during an air pollution episode in autumn Chengdu[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(8): 2840-2845.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I8/2840

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