Pollution characteristics, key toxic components and sources of PM2.5-bound heavy metals in coking polluted area of Jiexiu, Shanxi
LI Hong-yan1, ZHAO Zhi-xin1, HE Qiu-sheng1, FU Guo1, LI Hong-yu2, BAI Jing-ai3, HUANG Shi-dan1, ZHANG Yan-ru1, YUN Yang4, CUI Yang1, WANG Zhen-tao1
1. School of Environment and Resources, Taiyuan University of Science and Technology, Taiyuan 030024, China; 2. Key Laboratory for Environmental Pollution Prediction and Control, Gansu Province, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China; 3. Fenner School of Environment and Society, Australian National University, Canberra ACT 2600, Australia; 4. College of Environmental & Resource Sciences, Shanxi University, Taiyuan 030006, China
Abstract：On the basis of analyzing pollution characteristics of 11kinds of heavy metal elements in atmospheric PM2.5 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 PM2.5 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 PM2.5-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.
李宏艳, 赵志新, 何秋生, 付国, 李宏宇, 白京霭, 黄时丹, 张琰茹, 云洋, 崔阳, 王振涛. 山西介休焦化区PM2.5重金属污染特征、关键毒性组分与来源[J]. 中国环境科学, 2023, 43(4): 1528-1538.
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. Pollution characteristics, key toxic components and sources of PM2.5-bound heavy metals in coking polluted area of Jiexiu, Shanxi. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1528-1538.
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