山西介休焦化区PM<sub>2.5</sub>重金属污染特征、关键毒性组分与来源

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Abstract On the basis of analyzing pollution characteristics of 11kinds of heavy metal elements in atmospheric PM_2.5 samples from Jiexiu coking area (JX) and Fangshan control area (FS), the key toxic components that potentially threaten human health and their sources were identified using positive definite matrix factor (PMF) source apportionment, health risk assessment and in vitro cytotoxicity test. The results showed that the concentrations of PM_2.5 and its loaded heavy metals in JX exceeded the ambient air quality standards seriously, and exhibited seasonal variation following the sequence of winter > autumn > summer > spring. The total non-carcinogenic and carcinogenic risks of all elements in JX were 2.80 and 2.10 times that of FS, respectively. Except that the annual average concentration of element Cr in JX was lower than that of FS, the concentrations of elements Pb, Cd, Zn, As, Mn, and Sb in JX were 15.9, 9.80, 9.00, 7.40, 7.00 and 4.20 times that of FS, respectively. Among them, Mn, As, Cd, Pb had high non-carcinogenic risks, while Pb also had high carcinogenic risk. Among the 5 major sources of PM_2.5-bound heavy metals in JX, coal combustion and coking contributed the most (37.7%), followed by other industrial sources (29.6%), iron and steel smelting sources (20.4%). Coal combustion and coking contributed as high as 38.8% and 44.9% to non-carcinogenic and carcinogenic risks, respectively, and they were the only ones that had a significant positive correlation with cellular oxidative stress and toxicological indicators related to the inflammatory reaction (ROS, TNF-α and IL-1β). Except for As, the carcinogenic and non-carcinogenic levels of other heavy metal elements were within acceptable range, and coal combustion contributed the most to health risks and cytotoxicity.

Key words： PM_2.5 heavy metal elements pollution characteristics key toxic components source apportionment

Received: 23 August 2022

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X513

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	Articles by authors
	LI Hong-yan
	ZHAO Zhi-xin
	HE Qiu-sheng
	FU Guo
	LI Hong-yu
	BAI Jing-ai
	HUANG Shi-dan
	ZHANG Yan-ru
	YUN Yang
	CUI Yang
	WANG Zhen-tao

Cite this article:

LI Hong-yan,ZHAO Zhi-xin,HE Qiu-sheng等. Pollution characteristics, key toxic components and sources of PM_2.5-bound heavy metals in coking polluted area of Jiexiu, Shanxi[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1528-1538.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I4/1528

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