【摘要】 目的了解佳木斯市大气PM2.5中多环芳烃(PAHs)的污染特征。方法于2012年冬季连续2周采集了佳木斯郊区大气PM2.5样品,采用GC/MS定量分析了佳木斯市PM2.5中16种多环芳烃的含量。结果大气中PM2.5的质量浓度范围为55.63~120.72μg/m3,均值为74.80μg/m3;PAHs浓度范围是24.49~220.78 ng/m3,均值为102.82 ng/m3,多环芳烃中荧蒽、芘和菲等化合物相对含量较高,占多环芳烃总量的53.58%,利用化合物比值进行源解析,PM2.5中PAHs主要以燃煤为主,而非机动车排放;采用苯并(a)芘和苯并(a)芘等效质量浓度(BaPE)对佳木斯市大气颗粒物PM2.5中的PAHs进行致癌风险评价,BaP日均值为7.19 ng/m3,BaPE日均值为8.62 ng/m3,均超过了居民区标准限值(2.5 ng/m3),污染较为严重。结论佳木斯市大气PM2.5中多环芳烃主要来源于燃煤,BaP污染较为严重。更多还原

【Abstract】 Objective To investigate pollution characteristics and health risk assessment of PM2.5 polycyclic aromatic hydrocarbons. Methods PM2.5 were collected consecutively for one week in winter in 2012 in suburb of Jiamusi. A total of 16 EPA priority PAHs were extracted by ultrasonic extraction method and were quantified using GC/MS. Results PM2.5 mass concentrations ranged 55.63-120.72 μg/m3with an average of 74.80 μg/m3, while PAHs mass concentrations ranged 24.49-220.78 μg/m3with an average of 102.82 μg/m3. The ratio analysis suggested coal-burning was the predominant sources for PAHs from PM2.5 in Jiamusi, not vehicle emission. PAHs profile was predominated by fluoranthene, pyrene and phenanthrene and the average contribution was 53.58%. Adopting benzo(a) pyrene(BaP) and benzo(a) pyrene-equivalent carcinogenic concentration(BaPE) to evaluate carcinogenic power of PAHs in PM2.5, the daily average concentration of BaP was 7.19 ng/m3 and the daily average concentration of BaPE was 8.62 ng/m3. The BaP and BaPE concentration were in excess of the regional standard(2.5 ng/m3), the level was higher. Conclusions Coal-burning is the predominant source for PAHs from PM2.5 in Jiamusi and BaP concentration is higher.更多还原