摘要
利用分级采样器分别采集北京市不同区域采暖期的大气颗粒物,分析多环芳烃的组成及含量.结果表明北京市大气总悬浮颗粒物中总多环芳烃的含量城乡结合带为7486—43687ng·m-3,郊区为11993—39786ng·m-3.在城乡结合带,80%以上的多环芳烃存在于粒径<20μm的颗粒物中;在郊区,77%以上的多环芳烃存在于粒径<20μm的颗粒物中.比较不同环数的多环芳烃在不同粒径范围内大气颗粒物中的分配比例,发现随环数的减少其分配比例呈现归一化.不同粒径范围的颗粒物中苯并(a)芘均与总多环芳烃含量显著相关(p<0001).
The polycyclic aromatic hydrocarbons (PAHs)in the fractionated aerosol particles were sampled and analyzed in two different areas of Beijing during heating period.Data showed toal PAHs concentration in total suspended particles (TSP)ranged from 74 86 to 436 87ng·m -3 in suburban area and from 119 93 to 397 86ng·m -3 in rural area,respectively.In suburban area,93% of total PAHs enriched in the particles with the diameter less than 7μm.In rural area the percentages were 92,respectively,in the same particle fraction.However,the distribution of PAH compounds with different ring tended to be uniform with the decrease in particle diameter.There were close relationships between BaP and ΣPAH in all studied size fractions( p <0 001).
出处
《环境化学》
CAS
CSCD
北大核心
2004年第6期681-685,共5页
Environmental Chemistry
基金
973项目(2003CB415003)
中国科学院知识创新项目(KZCX3SW424)资助
