成都市冬季PM2.5中多环芳烃的源解析与毒性源解析

对成都市2010~2011年住宅区冬季PM2.5中16种多环芳烃(PAHs)进行了来源解析、毒性评估以及毒性源解析研究.结果表明,16种PAHs普遍检出,成都市冬季PM2.5中的ΣPAHs浓度范围为22.79~215.82ng/m3,平均浓度为71.38ng/m3.PAHs组分分析结果显示,低环(2~3环)PAHs含量较低,高环(4~6环)所占比例较大,其比例范围为75.95%~99.52%.利用EPA PMF5.0解析PAHs污染源类型,结果表明成都市冬季PM2.5中PAHs的主要来源是煤和木材燃烧源、柴油燃烧源和汽油燃烧源,其分担率分别是14.88%、31.34%和54.08%.等效因子(TEF)毒性评估表明,成都市冬季的TEQ均值为16.82ng/m3.此外,运用PMF-TEF耦合模型对PAHs进行了毒性源解析,结果表明煤和木材燃烧、柴油燃烧和汽油燃烧的毒性分担率分别是12.39%、24.78%、62.83%.

Source apportionment and toxicity quantitation of PM2.5-associated polycyclic aromatic hydrocarbons obtained from Chengdu,China

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.