广州灰霾期大气颗粒物中多环芳烃粒径的分布

The particle diameter distribution of polycyclic aromatic hydrocarbons (PAHs) in atmospheric particle during haze period in Guangzhou.

对2003年广州严重灰霾期前后9d的大气样品进行了分析．结果表明。大气中颗粒物在积聚态颗粒物（0．32～1．80μm）和粗颗粒物（3．2～10．0μm）处有2个明显的峰；灰霾期积聚态颗粒物比粗颗粒物在TSP中占的比例高，而在灰霾结束后所占比例与粗颗粒物相当或略少；低环数多环芳烃在积聚态颗粒物段和粗颗粒物段各有一个峰。但主要分布在积聚态颗粒物中；高环数多环芳烃几乎完全分布在积聚态颗粒物中；从灰霾期至灰霾期后。低环数多环芳烃在积聚态颗粒物段的主峰粒径有逐渐减少的趋势，而对于高环数多环芳烃这一变化不大；比值TPAHs／TSP在灰霾期前后有较大的变化；由于比值BaP／BeP与TPAHs／TSP具有相同的变化趋势。降解作用可能是造成比值TPAHs／TSP变化的主要原因．

The atmospheric samples of 9 days before and after the serious haze period in Guangzhou the year 2003 were analyzed. There were two obvious peaks in the places in the accumulation mode （0.32～1.80μm） and the coarse mode （3.2～10.0μm） atmospheric particles; during haze period, the proportion of accumulation mode particles in TSP was higher than that of coarse mode particles; but after haze the proportion occupied was about the same or lower a little; each of the low ring PAHs had a peak in these two places of particles; but distributed mainly in the accumulated mode particles; almost all of high ring PAHs distributed in the accumulated mode particles; from haze period to after haze period the particle diameter of lowing PAHs in the freak of accumulation mode tended to decrease gradually; but this change was small in high ring PAHs; the ratios of TPAHs/TSP changed more greatly before and after the haze period; the ratios of BaP/BeP had the same change trend with TPAHs/TSP degradation might be the main cause of this change.