摘要
利用大流量颗粒物采样器采集了2005—2006年冬季北京市大气气溶胶中PM10和PM2.5样品,采用气相色谱/质谱技术对样品中的多环芳烃进行检测.结果表明:北京市冬季大气颗粒物PM10和PM2.5中PAHs总量分别为520.5±476.9ng·m-3和326.8±294.3ng·m-3,且大部分存在于细粒子中,4环以上的稠环芳烃占总浓度的87%.根据荧蒽/芘等比值指标判别,北京市冬季PAHs主要以燃煤排放为主,其次是石油燃烧交通排放.风速增大和太阳辐射曝辐量增强,都会降低颗粒物中多环芳烃浓度.
The concentrations of PAHs in PM2.5 and PM10 samples were analyzed via GC/MS. The results showed that there were serious PAH pollutions in the atmospheric aerosols of Beijing . The total amount of PAHs in PM10 and PM2.5 were 520. 5 ±476. 9ng · m^-3 and 326.8 ±294. 3ng · m^-3, respectively. PAHs that are four and more rings enriched in fine particulates were up to 87%. It is indicated by the characteristic ratio such as Fuloranthene/pyrene that the primary source of PAHs was the coal combustion, secondary did the gasoline. Simultaneously, PAHs concentrations of aerosol in the atmosphere were influenced by meteorological factors. For example, PAHs concentrations will decrease with a high wind speed or high exposed radiation.
出处
《环境化学》
CAS
CSCD
北大核心
2008年第4期490-493,共4页
Environmental Chemistry
基金
国家重点基础研究发展规划(973)项目(2007CB407303和2006CB403701)
国家杰出青年基金项目(40525016)
LAPC开放课题基金
