【摘要】 使用中流量采样器采集温州城区2015年4个季节的大气PM_2.5样品,利用气相色谱（GC）—质谱（MS）联用仪对PM_2.5样品中16种优先控制的多环芳烃（PAHs）进行分析,研究PM_2.5中PAHs的污染特征及其可能来源。结果显示,PM_2.5中总PAHs质量浓度为5.12⁸1.59ng/m³,且表现为冬季>秋季>春季>夏季,季节性变化特征明显。比值法和主成分分析显示,温州城区大气PM_2.5中PAHs的主要污染源是燃煤、机动车尾气以及生物质燃烧。总PAHs日均毒性当量浓度为0.44¹1.28ng TEFs/m³,平均值为3.44ng TEFs/m³。成人和儿童的终生超额致癌风险（ILCR）年均值分别为7.11×10^-7、4.98×10^-7,表明温州城区PM_2.5中PAHs对人体健康影响水平较低,在可接受范围内。更多还原

【Abstract】 PM_2.5 samples of 4 seasons were collected in Wenzhou using a sampler of medium-flow capacity in 2015,and 16 kinds of polycyclic aromatic hydrocarbons（PAHs）bound to PM_2.5 were analyzed by gas chromatography（GC）-mass spectrometer（MS）to investigate their pollution characteristics and sources.The results indicated that annual average of the measure total PAHs in PM_2.5 ranged from 5.12ng/m³ to 81.59ng/m³,and the order of PAHs concentration was winter>autumn>spring>summer,showing obvious seasonal variations.Ratio method and principal component analysis（PCA）suggested that the PAHs bound to PM_2.5 were mainly from coal combustion,vehicle exhaustand biomass burning.The daily mean values of total toxicity equivalent conocentration ranged from 0.44 ng TEFs/m³ to 11.28 ng TEFs/m³,with the average value 3.44 ng TEFs/m³.The yearly values of excess lifetime cancer risk（ILCR）for adults and children were 7.11×10^-7 and 4.98×10^-7,respectively,meaning that PAHs bound to PM_2.5 had small effect on the health of people in Wenzhou,which was within the acceptable limit.更多还原