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[目的]探讨贵阳市城区大气细颗粒物(PM_(2.5))中多环芳烃(PAHs)的污染特征。[方法]选择贵阳市交通居民混杂的南明区和以旅游为主的花溪区为采样点,分别于2014年10—12月份采样,共测定42个PM_(2.5)样品中PAHs的含量,采用特征比值法分析PAHs的结构和来源。[结果]南明、花溪两城区PM_(2.5)中PAHs总浓度分别为(7.12~30.23)、(7.12~24.26)ng/m~3,平均浓度分别为(14.72±1.51)、(13.86±1.42)ng/m~3;两个区的大气PM_(2.5)样品中均检出苯并[a]芘,浓度分别为0.68~5.04 ng/m~3、0.38~3.63 ng/m~3,日均浓度超标率分别为19.0%、14.3%;两城区不同化学结构PAHs对总浓度的贡献不同,均为5环>4环>6环>3环>2环。[结论]贵阳市南明、花溪两城区PM_(2.5)中PAHs主要来源于燃煤和车辆排放。
[Objective] To investigate the pollution characteristics of polycyclic aromatic hydrocarbons (PAHs) in fine particulate matter (PM_ (2.5)) in urban area of Guiyang. [Method] A total of 42 PM 2.5 samples of PAHs in Nanming District and Huaxi District, which are mainly tourists, were sampled from October to December in 2014. The content of PAHs in 42 PM_ (2.5) Ratio analysis of PAHs structure and source. [Results] The total concentrations of PAHs in PM 2.5 in Nanming and Huaxi were (7.12-30.23) and (7.12-24.26) ng / m 3, respectively, and the average concentrations were (14.72 ± 1.51) and (13.86 ± 1.42) ng / m ~ 3. Benzo [a] pyrene was detected in the PM_ (2.5) samples of the two regions with concentrations of 0.68 ~ 5.04 ng / m ~ 3 and 0.38 ~ 3.63 ng / The concentrations exceeding the standard rates were 19.0% and 14.3%, respectively. The contributions of PAHs in different chemical structures in the two cities were different for the total concentration, which were all in the order of 5 rings> 4 rings> 6 rings> 3 rings> 2 rings. [Conclusion] The PAHs in PM 2.5 in Nanming and Huaxi areas of Guiyang mainly come from the coal and vehicle emission.