徐州市区大气颗粒物中多环芳烃的污染特征

采用高效液相色谱技术（HPLC）对徐州市大气颗粒物中优控的16种多环芳烃（PAHs）进行定量研究。结果表明：萘、芴、苊等低分子量芳烃的含量相对较低;苯并（g,h,i）苝、茚并（1,2,3-cd）芘、苯并（k）荧蒽、苯并（a）芘等高分子量芳烃的含量相对较高;含量最高的单体为荧蒽,占待检的16种PAHs的19%以上。不同环数多环芳烃含量大小顺序为：4环〉5环〉6环〉3环〉2环。可吸入颗粒物（PM10）中苯并（a）芘和∑PAHs在不同功能区的分布特征大体上一致,并呈现一定规律性：交通干线区〉工业区〉风景文化区〉居民区〉新城区。由此可以初步认为徐州市区PM10中的PAHs主要来源于燃煤和汽车尾气。

Pollution Characteristics of Polycyclic Aromatic Hydrocarbons in Atmospheric Particulate of Xuzhou City

The composition of 16 priority polycyclic aromatic hydrocarbons（PAHs） in fly ash samples of Xuzhou were analyzed quantitatively by using HPLC technique.The results showed that the low molecular weight aromatic hydrocarbons,such as naphthalene,fluorene,acenaphthene,locates at low levels,while the high molecular weight aromatic hydrocarbons locates at high levels,such as benzo（g,h,i）perylene,indene（1,2,3-cd）pyrene,benzo（k） fluoranthene and benzo（a） pyrene,of which the concentration of fluoranthene was the highest,reaching about 19%.The concentration of PAHs with various rings were found to be in the order of 4 rings5 rings6rings3 rings2 rings.Distribution of benzo（a） pyrene and ΣPAHs in PM10 of different function areas were broadly consistent and showed a certain regularity： traffic route districtindustrial parkscenic and cultural arearesidentialnew district,the PAHs in PM10 of Xuzhou mainly came from coal-burning and car exhaust.