大宝山矿区周边大气重金属来源与风险评估

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Abstract To understand the pollution characteristics and potential ecological and health risks of heavy metals in atmospheric PM_2.5 around Dabaoshan polymetallic mining area, PM_2.5 samples were collected and analyzed for 15 heavy metals including Al, Ti, Cr, Mn, Ni, Cu, Zn, As, Mo, Ag, Cd, Sn, Sb, Tl and Pb from August 20 to September 10, 2022 and October 18 to November 8, 2022, at Tielong Middle School, Tielong Town, Wengyuan County. The positive matrix factorization (PMF) model was utilized in conjunction with correlation analysis was to identify the source of relevant heavy metals. Additionally, risk assessments were conducted employing both the potential ecological risk model and health risk model. The findings revealed that out of the fifteen metals analyzed in atmospheric PM_2.5, Al, Zn, Pb, and Mn exhibited the highest concentrations, collectively accounting for 87.8% of the total measured metal concentration. Their average concentrations were determined as follows: Al (112.70ng/m³), Zn (11.96ng/m³), Pb (68.53ng/m³)and Mn (26.82ng/m³). The remaining heavy metals displayed average concentrations ranging from 0.12ng/m³ to 7.99ng/m³. Variations in seasonal distribution of different metal elements were influenced by the emission from different pollution sources under varying wind directions. Atmospheric PM_2.5 primarily contains heavy metals originating from six main sources: cement production (13.8%), metal smelting (24.6%), dust sources (13.7%), sludge disposal (19.4%), traffic sources (9.4%), and a composite source of natural sources and agricultural sources (19.1%). The results of the ecological risk and health analysis evaluation showed that the comprehensive ecological risk level of heavy metals in the study area was classified as “strong”. Specifically, Cd posed an “extremely high” ecological risk, Sb exhibited a “strong” ecological risk, while the remaining heavy metals posed a “slight” ecological risk. The overall non-carcinogenic risk from heavy metals was relatively low. However, Cr presented a significant carcinogenic risk, and both As and Cd carried certain carcinogenic risks.

Key words： PM_2.5 heavy metal health risks PMF model source apportionment

Received: 28 April 2023

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X511

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	WU Kai-zhang
	LIU Ming
	LUO Zhong-hua
	CHEN Lai-guo
	CAI Li-mei
	WANG An-hou
	ZHENG Yu
	LU Hai-tao

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WU Kai-zhang,LIU Ming,LUO Zhong-hua等. Sources and risk assessment of atmospheric heavy metals in the vicinity of Dabao Mountain mining area[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(12): 6270-6280.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I12/6270

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