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利用气相色谱一离子阱串联质谱法定量研究了南京市春秋两季大气PM2.5,中的九种羟基多环芳烃(2~5环).结果表明,春秋两季气溶胶中羟基多环芳烃的浓度相近,总量分别为2045Pg·m13和2091Pg·m-3,其中五环的羟基多环芳烃约占总量的60%左右.单体浓度在80~500Pg·m-3.春秋两季的实验结果均表明羟基多环芳烃白天的浓度高于晚上.昼夜浓度比值在1.37~1.66.与国际上一些城市相比,南京市大气气溶胶中羟基多环芳烃的浓度要高出很多. “,”Nine hydroxylated polycyclic aromatic hydrocarbons (HO-PAHs) in PM25 from Nanjing were measured using a gas chromatography-ion trap mass spectrometry. Total concentrations of 9 HO-PAHs were 2045 pg-m-3 in spring and 2091 pg. m-3 in autumn, respectively. Average concentrations of the individual compounds were in the range of 80 -500 pg.m-3 with much high abundance of high molecular weight HO-PAHs. The ratio of daytime level to nighttime level ranged from 1.37 to 1.66, suggesting the formation enhancement of OH-PAHs by diurnal radical reaction. In comparison with those reported for other cities, relatively higher pollution levels of particle-bound OH-PAHs were identified in the air.