兰州市大气OPAHs污染特征及潜在来源分析

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Abstract A field campaign was conducted to monitor oxygenated polycyclic aromatic hydrocarbons (OPAHs) concentrations in gas phase and particulate matter (PM_1.0, PM_2.5 and PM₁₀) in a winter week (December 1^st~7^th, 2016) and a summer week (August 3^rd, 2017) across the Lanzhou City. The results showed that total gaseous + particulate concentration of Σ₈OPAHs ranged from 1.83 to 19.28ng/m³ with a mean of (6.45 ±3.43) ng/m³. The atmospheric Σ₈OPAHs level in the winter week was 2.06 times that in the summer week. Particle-bound OPAHs contributed to a large proportion to both 2.5~10 and <1.0μm size ranges in the winter week, whereas in the summer week, OPAHs were generally detected in PM_1.0. 9-Fluorenone (9-FLU), 9,10-Anthraquinone (9,10-ANT) and Benzanthrone (BZA) were the most abundant OPAHs, accounting for 51.8%~94.9% of the total, from which the absorption mechanism was thought to dominate the gas-particle partitioning of sampled OPAHs. The results from a concentration weighted trajectory (CWT) model reveal that the OPAHs concentration in Lanzhou was significantly affected by local emission sources in the winter week, followed by long-distance atmospheric transport from the northwest of Lanzhou, covering the part of Xinjiang and Qinghai Provinces. In the summer week, the OPAHs mainly presented in the southeast of Lanzhou, such as Dingxi and Tianshui and the northeast, such as Zhongwei in Ningxia Hui Autonomous Region.

Key words： Lanzhou city oxygenated polycyclic aromatic hydrocarbons (OPAHs) pollution characteristics gas-particle partitioning mechanism pollution source PM_2.5

Received: 12 January 2022

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X513

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	Articles by authors
	LI Hong-yu
	LI Pei-qi
	HUANG Juan
	YANG Zhao-li
	LIU Peng
	ZHANG Li-yuan
	MA Hai-bo
	MAO Xiao-xuan
	GAO Hong
	HUANG Tao

Cite this article:

LI Hong-yu,LI Pei-qi,HUANG Juan等. Pollution characteristics and potential pollution source regions of atmospheric OPAHs in Lanzhou[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(8): 3561-3571.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I8/3561

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