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| Source identification and toxicity assessment of polycyclic aromatic hydrocarbons in particulate matter of Chengdu, China |
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Abstract PM10-associated polycyclic aromatic hydrocarbons (PAHs) were investigated in summer and winter 2009 from Chengdu, China. A total of 16 priority PAHs were measured, with the total concentrations (ΣPAHs) (ng/m3) ranging from 40.25 to 150.68 in winter and from 44.51 to 71.16 in summer, respectively. The average concentration of ΣPAHs were 88.36 in winter and 64.21 in summer. Meanwhile, the spatial distribution of PAHs was discussed. The results showed that the ΣPAHs in industry region exhibited the highest concentration while those in the background region showed the lowest level. In order to explore composition of PAHs, characteristics of low ring and high ring PAHs were explored. The high ring PAHs presented high fractions (86.7%~96.1%), indicating that the PAHs might be formed in high temperature combustion processes. In addition, in order to investigate potential source categories of PAHs in PM10, three statistical methods (ratio method, hierarchical cluster analysis, principal component analysis) were employed. Agreement results were obtained from above-mentioned different methods, suggesting that the main source categories of PAHs were vehicle emission and coal and wood combustion. Finally, the risk assessment of PAHs was determined by Benzo(a)pyrene equivalent (BaPE), which suggested that the toxicity of PAHs was at high level during winter and summer time.
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Received: 31 December 2013
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ZHANG Li, ZHANG Yuan, QI Shi-Hua, LI Hui, XING Xin-Li, ZHANG Ze-Zhou, ZHENG Huang, SUN Yan, MIN Yang. Characteristics of atmospheric PM2.5 and the variation of PAHs in PM2.5 during spring in Hongshan district, Wuhan[J]. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(8): 2319-2325. |
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