闭坑矿区多环芳烃污染特征、源解析和健康风险

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Abstract With the gradual depletion of shallow coal resources in mines and the continuous advancement of structural reforms on the supply side of national energy, the number of abandoned mines has increased, drawing growing attention to the environmental issues left behind in these areas. This study focuses on the abandoned mine in the Wansheng Economic Development Zone, Chongqing City. We collected five types of samples, including water (n=7), sediments (n=4), soil (n=8), coal gangue (n=2), and plants (n=10). The concentrations of the 16priority polycyclic aromatic hydrocarbons (PAHs) identified by the United States Environmental Protection Agency (USEPA) were analyzed using gas chromatography-mass spectrometry (GC-MS). Positive matrix factorization (PMF) and Monte Carlo simulation were employed to analyze the sources of PAH pollution and the carcinogenic risks in various environmental media within the abandoned mine. The results showed that the concentrations of PAHs in river, leachate, sediments, surface soil, coal gangue, and dominant plants were (45.6±12.4), (97.8±89.4)ng/L, (3640±2520), (6400±2650), (18600±1120), and (801±1110)ng/g, respectively. In the river, leachate, coal gangue, and dominant plants, the 2-3 ring PAHs are dominant, accounting for 83%, 71%, 39%, and 54%, respectively. In the sediment and surface soil, the 5-6 ring PAHs have a relatively high proportion, accounting for 37% in both.The PMF source apportionment results indicated that diagenetic sources and petroleum source (49%) and traffic sources (32%) were the main contributors to PAHs in water. Traffic sources (48%) and coal combustion sources (35%) were the primary sources of PAHs in surface soil, while traffic sources (46%) and petroleum source and coal combustion sources (38%) were the major sources of PAHs in dominant plants. Monte Carlo simulations revealed potential carcinogenic risks to local residents from soil, coal gangue, and self-cultivated vegetables in the abandoned mine, with adults facing higher health risks than children. Over 96% of the carcinogenic risks were attributed to dermal contact.

Key words： Polycyclic aromatic hydrocarbons abandoned mining area compositional characteristics health risk assessment Monte-Carlo simulation

Received: 03 September 2024

PACS:

X502

Corresponding Authors: 王锋文,责任作者,副教授,fengwenwang@cqu.edu.cn E-mail: fengwenwang@cqu.edu.cn

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	WANG Ding-ming
	LIU De-cai
	LIU Li
	MA Lei
	TANG Liang
	WANG Feng-wen

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WANG Ding-ming,LIU De-cai,LIU Li等. Pollution characteristics, source apportionment and health risk of polycyclic aromatic hydrocarbons in abandoned mining areas[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(4): 2086-2097.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I4/2086

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