Significant impact of coal combustion on VOCs emissions in winter in a North China rural site

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	Significant impact of coal combustion on VOCs emissions in winter in a North China rural site
	Zhang, Fei; Shang, Xiaona; Chen, Hui; Xie, Guangzhao; Fu, Yao; Wu, Di; Sun, Wenwen; Liu, Pengfei; Zhang, Chenglong; Mu, Yujing
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2020-06-10
卷号	720 页码:1-7
关键词	Volatile organic compounds Emission ratios Coal combustion Source apportionment OVOCs SOA formation potential
ISSN号	0048-9697
英文摘要	The measurement of volatile organic compounds (VOCs) was carried out using an online GC-FID/MS at a rural site in North China Plain from 1 Nov. 2017 to 21 Jan. 2018. Their concentrations, emission ratios and source apportionment are investigated. During the entire experiment period, the average mixing ratio of VOCs was 69.5 +/- 51.9 ppb, among which alkanes contributed the most (37% on average). Eight sources were identified in the non-negative matrix factorization (NMF) model as short-chain alkanes (13.3%), biomass burning (4.6%), solvent (10.8%), industry (3.7%), coal combustion (41.1%), background (4.5%), vehicular emission (7.7%) and secondary formation (14.2%). In addition to the formation of OVOCs through photochemical reactions, the primary sources, such as coal combustion, biomass burning, vehicular emission, solvent and industry, can also contribute to OVOCs emissions. High OVOCs emission ratios thus were observed at Wangdu site. Primary emission was estimated to contribute 50%, 45%, 73%, 77%, 40%, and 29% on average to acrolein, acetone, methylvinylketone (MVK), methylethylketone (MEK), methacrolein and n-hexanal according to NMF analysis, respectively, which was well consistent with the contribution from photochemical age method. Secondary organic aerosol formation potential (SOAFP) was evaluated by SOA yield, which was significantly higher under low-NOx condition (13.4 mu g m(-3) ppm(-1)) than that under high-NOx condition (3.2 mu g m(-3) ppm(-1)). Moreover, the photochemical reactivity and sources of VOCs showed differences in seven observed pollution episodes. Among, the largest OH loss rate and SOAFP were found in severe pollution plumes, which were induced primarily by coal combustion. Therefore, mitigation strategies for severe pollution formation should focus on reducing coal combustion emitted VOCs that lead to SOA formation. (C) 2020 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44554]
专题	生态环境研究中心_大气污染控制中心
推荐引用方式 GB/T 7714	Zhang, Fei,Shang, Xiaona,Chen, Hui,et al. Significant impact of coal combustion on VOCs emissions in winter in a North China rural site[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2020,720:1-7.
APA	Zhang, Fei.,Shang, Xiaona.,Chen, Hui.,Xie, Guangzhao.,Fu, Yao.,...&Chen, Jianmin.(2020).Significant impact of coal combustion on VOCs emissions in winter in a North China rural site.SCIENCE OF THE TOTAL ENVIRONMENT,720,1-7.
MLA	Zhang, Fei,et al."Significant impact of coal combustion on VOCs emissions in winter in a North China rural site".SCIENCE OF THE TOTAL ENVIRONMENT 720(2020):1-7.