深圳大气PM<sub>2.5</sub>中水溶性有机物的来源特征

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Abstract

This study systematically analyzed the Water-Soluble Organic matter (WSOM) in PM_2.5 collected during September 2017 to August 2018 in the northernzone in Shenzhen. The mass concentration, mass spectraand sources of WSOM were obtained. The average mass concentration of PM_2.5 was (32.3±18.4)μg/m³. WSOM was determined to be 77.6%±14.0% of the organic matter (OM), with anaverage mass concentration of (9.4±5.7)μg/m³. As shown in the mass spectrometry, the average O/C ratio of WSOM was 0.57±0.99, which was within thetypical range ofthe O/C valuesof SOA. Meanwhile, the abundant C₂H₄O₂⁺ proved that biomass burning organic aerosol (BBOA) contributed significantly to the WSOM. Furthermore, positive matrix factorization (PMF) model was applied to perform source apportionment of WSOM and three reasonable factors were identified, including BBOA, more oxidized oxygenated OA (MO-OOA) and less oxidized oxygenated OA (LO-OOA), accounting for 16.5%, 51.7% and 31.8%, respectively. Compared to spring and summer, BBOA and MO-OOAcontributed more in autumn and winter,which was more closely related to inland pollution transport based on backward trajectory analysis. Thelittle variation of LO-OOA in different air masses possibly impliedits local sources. ¹⁴C measurement was conducted to help separate fossil and non-fossil emissions of WSOM, and the fossil fuel-derived secondary organic matterwas found to dominate the WSOM mass (53.9%). Therefore, it's necessary to strengthen the control of fossil fuel sources in order to reduce WSOM pollution.

Key words： water-soluble organic matter (WSOM) positive matrix factorization (PMF) ¹⁴C measurement source apportionment

Received: 22 October 2019

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X513

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	Articles by authors
	SUN Yi-fei
	LI Meng-lin
	JIANG Jia-hao
	DAI Jing
	GAO Mao-shang
	HUANG Xiao-feng
	HE Ling-yan

Cite this article:

SUN Yi-fei,LI Meng-lin,JIANG Jia-hao等. Source apportionment of water-soluble organic matter in PM_2.5 in Shenzhen[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(5): 1869-1876.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I5/1869

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