太原市气悬颗粒物上多环芳烃的测量与分布研究

Measurements and research on the distribution of aerosol particle-bound polycyclic aromatic hydrocarbons in Taiyuan

2 0 0 1年 3月下旬 ,在太原市建成区均匀布设 1 5个网格点 ,利用新型便携式仪器 ,连续 5天监测了各点大气颗粒物上多环芳烃 (PPAHs)的浓度。结果表明 ,PPAHs浓度范围为 3 6ng/m3～ 3 1 3 ng/m3;全市上下午平均浓度为 1 3 9ng/m3;上午浓度平均值是下午的 2倍 ;全市空间分布整体上由北向南逐渐降低 ,东北部最重 ,东南部最轻 ;不同功能区的污染程度依次为 :一电厂化工区 >太钢工业区 >桃园商业区 >太行居民区。本文还着重探讨了污染分布的成因 ,并提出了改善大气质量的建议。

With new portable instruments, measurements on the concentration of particle bound polycyclic aromatic hydrocarbons (PPAHs) were carried out at 15 evenly divided grids in the constructed area of Taiyuan for continuous 5 days in March of 2001 The result showed that the concentration of PPAHs in the 15 sites ranged from 36ng/m 3 to 313 ng/m 3; the daily average concentration of the whole city was 139ng/m 3; the morning average concentration was 2 times higher than the afternoon average In a whole, the spatial distribution of PPAHs in the city declined gradually from north to south The highest pollution was found in the northeast area while lowest in the southeast The rank of concentrations at different function areas was: Chemical industrial area>Iron steel industrial area>Commercial area>Residential area The causes of PPAHs distribution formation were analyzed and some suggestions were proposed to improve the air quality