上海市大气PM2.5中溶剂可抽提有机物的特征研究

利用溶剂抽提、分离、毛细管气相色谱-质谱联用技术对2000年10月至2001年8月上海市5个不同功能区采集的大气PM_(2.5)样品中的溶剂可抽提有机物进行了检测,共检测出正构烷烃、单环芳烃、多环芳烃、有机酸、有机醇、有机酯等各类溶剂可抽提有机化合物267种。检出的82种多环芳烃中有15种属于美国EPA优先控制污染物名单。比较了不同季节、不同区域PM_(2.5)样品中正构烷烃、多环芳烃等化合物分布特征的差异。检出的喹啉类含氮杂环类化合物以及有机酸等污染物表现出一定的机动车排放特征。

Study on the Characteristics of Extractable Organic Compounds in Atmospheric PM2.5 in Shanghai

In the PM2.5 samples collected from the five sites of Shanghai during Oct. 2000 to August 2001, the extractable organic compounds were obtained by ultrasonic extraction and separarted into several fractions, then further analyzed by GC/MS. 267 kinds of extractable organic compunds have been detected, including 82 kinds of PAHs, among which 15 in the U.S.EPA priority pollutant list. The different distribution of compounds such as n-alkane and PAHs in PM2.5 samples from different seasons or districts have also been compared. Pollutants Such as azaarenes and organic acids indicated the contribution of vehicle exhaust.