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| Source apportionment and toxicity quantitation of PM2.5-associated polycyclic aromatic hydrocarbons obtained from Chengdu, China |
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Abstract In this study, PM2.5-associated polycyclic aromatic hydrocarbons (PAHs) were investigated in Chengdu, China, during the winter in 2010~2011. A total of 16 priority PAHs were measured, then the source identification, risk assessment and toxicity quantitation were conducted. The results showed that the total concentrations (ΣPAHs) ranging from 22.79 to 215.82ng/m3, with the average concentration 71.38ng/m3. The percentage of high ring (4~6ring) PAHs were in large proportion, ranging from 75.95% to 99.52%. Source apportionment were estimated by EPA PMF5.0 model and five sources were identified, including coal and wood combustion, diesel exhaust emissions and gasoline exhaust emissions. The risk assessment of PAHs was determined by the Equivalent factor (TEF), indicating that the toxicity of PAHs presenting in cute level. Finally, the PMF-TEF model was used to apportion the source contributions to toxicity of PAHs, illustrating that the toxicity contribution of PAHs from coal and wood combustion (12.39%), diesel exhaust emissions (24.78%) and gasoline exhaust emissions (62.83%). The conclusion in this work can provide the useful information in the process of the comprehensive environmental control.
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Received: 23 March 2015
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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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