【摘要】 于2002年夏季(7月)和冬季(12月)采集南京市5个功能区的大气气溶胶(PM2.5和PM10)样品,对两个季节不同功能区颗粒物及其颗粒物中正构烷烃的分布特征和污染来源进行了分析。结果表明,南京市大气颗粒物含量冬季高于夏季,细颗粒高于粗颗粒。正构烷烃的变化规律同颗粒物一致,且主要分布在细颗粒物上。根据各个功能区正构烷烃(C15-C32)的CPI(CPI1、CPI2和CPI3)结果,可知南京市大气气溶胶中正构烷烃由生物源和人为源共同排放产生。%waxCn的结果表明生物源对气溶胶中正构烷烃的贡献率为20%~43%,对南京市大气颗粒物的贡献率为1.66%~4.76%。更多还原

【Abstract】 The atmospheric aerosols (PM_ 2.5 and PM_ 10 ) of five function regions in Nanjing City were collected in summer (July) and winter (December), 2002. And the concentrations, characterization and source apportionment of particulate matter and n-Alk were analyzed. The results showed that the concentrations of particulate matter, dominated in fine mode, was much higher in winter. And the n-Alk, which had similar variation to that of particulate matter, favored in fine particulate. According to the values of carbon preference index CPI (CPI1, CPI2 and CPI3), it can be concluded that n-Alk (C_ 15 -C_ 32 ) was both of biogenic and anthropogenic characteristics. The percent contribution of leaf “wax” n-Alk indicated that about 20%~43% of n-Alk came from waxy leaf surface abrasion, and 1.66%~4.76% of the particulate matter in Nanjing was from biogenic source.更多还原