中国典型背景站夏季VOCs污染特征及来源解析

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Abstract 57 volatile organic pollutants at four representative background stations, namely, Pangquangou, Shennongjia, Wuyishan and Changdao in China, were collected using SUMMA Canisters and analyzed by GC-FID/MS methods during summer of 2019. Concentration, composition and diurnal variation characteristics of VOCs were discussed and the PMF model was used to identify the source of VOCs and its ozone formation potential (OFP). The results showed that the averaged VOCs concentration at Pangquangou, Shennongjia, Wuyishan and Changdao background sites were (23.06±8.14)×10^-9, (8.25±4.27)×10^-9, (7.95±11.31)×10^-9 and (11.98±8.80)×10^-9, respectively. The concentrations of alkane, aromatics, alkenes and alkynes at all background sites but Pangquangou were significantly lower than that in urban sites. The respective proportions of alkane, aromatics, alkenes in background sites were similar with that in urban sites, while the proportions of alkynes at background sites were significantly lower than that in urban sites. The diurnal variations of alkane and aromatics at background sites showed a pattern of declining in the day and accumulating at night, while alkenes reach its peak concentration at 09:00~15:00. Source apportionments by PMF model and components analysis showed that the VOCs concentrations and OFP at four background sites were affected significantly by anthropogenic sources. The contribution from sources of gasoline and organic solvents evaporation, usage of coating material and automobile exhaust at four background sites ranged from 39% to 58% of VOCs and 35% to 58% of OFP. Besides, the sources related to fuel combustions contributed 18% to 21% of VOCs and 13% of OFP, respectively. Sources from plant emission processes contributed 7% to 17% of VOCs and 8% to 33% of OFP at 4 background sites, which were higher than that at urban sites.

Key words： VOCs characteristics of component source apportionments PMF background sites

Received: 24 September 2020

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X511

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	XIAO Long
	WANG Shuai
	ZHOU Ying
	CHAI Wen-xuan
	DU Li
	TANG Gui-gang
	LI Jian-jun

Cite this article:

XIAO Long,WANG Shuai,ZHOU Ying等. The characteristics and source apportionments of VOCs at typical background sites during summer in China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(5): 2014-2027.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I5/2014

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