沈阳市冬季不同污染程度PM<sub>2.5</sub>中OC和EC污染特征

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Abstract The organic carbon (OC) and elemental carbon (EC) in PM_2.5 were measured by organic carbon/elemental carbon analyzer from December 2018 to January 2019 in Shenyang. The pollution characteristics of carbon components under different pollution levels were studied. The pollution of carbon component was serious in winter of Shenyang, and the total carbon aerosol (TCA) accounted for 36.3%~42.8% of PM_2.5 at different pollution levels. The average mass concentrations of PM_2.5, OC and EC were 148.6, 29.6 and 6.6μg/m³ in moderate/heavy pollution days respectively, which were 3.1~3.3times of those in clean days. The diurnal variations of PM_2.5, OC and EC showed a high value in the morning and evening and low in the afternoon. At any time, the concentrations of PM_2.5, OC and EC showed as moderate/heavy pollution> light pollution> clean days. The OC/EC ratios under different pollution levels were all higher than 2. The OC/EC ratio of pollution days ranged from 2.1 to 25.3, which indicated that coal combustion and vehicle exhaust emissions were the main sources of OC and EC in pollution days. The secondary organic carbon (SOC) increased with pollution levels, with the concentration of 2.9, 6.5 and 10.6μg/m³ in clean, light pollution and moderate/heavy pollution days, respectively. The backward trajectory simulation showed that the pollution days in winter of Shenyang were mainly affected by air masses from the northward and northwest directions.

Key words： PM_2.5 Shenyang city organic carbon (OC) elemental carbon (EC) pollution characteristics

Received: 23 November 2020

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X513

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	ZHANG Yu-xiu
	REN Wan-hui
	WANG Jia-he
	SU Zong-zong
	ZHANG Rui-fang
	YU Xing-na

Cite this article:

ZHANG Yu-xiu,REN Wan-hui,WANG Jia-he等. Characteristics of organic carbon (OC) and elemental carbon (EC) under different pollution levels of PM_2.5 during winter in Shenyang[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(7): 3066-3075.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I7/3066

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