深圳大气颗粒物中卤代多环芳烃污染研究

Pollution of Halogenated Polycyclic Aromatic Hydrocarbons in Atmospheric Particulate Matters of Shenzhen

利用GC-MS方法分析了卤代多环芳烃在深圳市大气颗粒物(PM10和PM2.5)中的含量水平.所关注的9种卤代多环芳烃在PM10和PM2.5中的含量范围分别是118~1 476 pg·m-3和89~407 pg·m-3.在PM10和PM2.5样品中,9-Br Ant的含量水平最高,其次是7-Br Ba A和9,10-Br2Ant.深圳市大气PM10和PM2.5中卤代多环芳烃总含量水平表现出冬季>秋季>春季>夏季的季节变化规律,但是各卤代多环芳烃单体含量水平的季节变化特征不同.温度、降水量和相对湿度等气象条件可能是影响大气PM10和PM2.5中卤代多环芳烃含量水平季节变化特征的重要因素.此外,PM10和PM2.5中卤代多环芳烃的含量水平与母体多环芳烃之间存在显著的相关关系.最后,本研究估算了卤代多环芳烃的毒性当量,大气PM10和PM2.5中卤代多环芳烃的毒性当量变化范围分别是17.6~86.2 pg·m-3和14.6~70.4 pg·m-3.其中,7-Br Ba A对卤代多环芳烃总毒性当量的贡献最大.结果表明深圳市大气PM10和PM2.5中卤代多环芳烃的总毒性当量低于母体多环芳烃.

Concentrations of halogenated polycyclic aromatic hydrocarbons (HPAHs) in atmospheric PM10 and PM2. 5 samples collected from Shenzhen were determined using GC-MS. Total concentrations of nine HPAHs in atmospheric PM10 and PM2. 5 samples ranged from 118 to 1 476 pg?m - 3 and 89 to 407 pg?m - 3 , respectively. In PM10 and PM2. 5 samples, the concentration of 9-BrAnt was the highest, followed by 7-BrBaA and 9, 10-Br2 Ant. Seasonal levels of total HPAHs in atmospheric PM10 and PM2. 5 samples in Shenzhen decreased in the following order: winter ﹥ autumn ﹥ spring ﹥ summer, whereas concentrations of individual HPAHs showed different seasonal levels. Meteorological conditions, including temperature, precipitation, and relative humidity, might be important factors affecting the seasonal levels of HPAHs in atmospheric PM10 and PM2. 5 . In addition, there were significant correlations between concentrations of HPAHs and parent PAHs. Finally, the toxic equivalency quotients ( TEQs) of HPAHs were estimated. The TEQs of HPAHs in atmospheric PM10 and PM2. 5 samples ranged from 17. 6 to 86. 2 pg?m - 3 and 14. 6 to 70. 4 pg?m - 3 , respectively. Among individual HPAHs, 7-BrBaA contributed greatly to the total TEQs of HPAHs. Our results indicated that the total TEQs of HPAHs were lower than parent PAHs in atmospheric PM10 and PM2. 5 samples in Shenzhen.