摘要
采集了鄂尔多斯市5个监测点大气气溶胶中的PM10和PM2.5颗粒物样品,用色谱-质谱技术检测了多环芳烃化合物(PAHs).结果表明,萘、苊、二氢苊等低分子量PAHs的浓度较低,、苯并[a]芘、茚并[1,2,3-cd]芘、苯并[ghi]苝等高分子量PAHs的浓度较高.东胜、棋盘锦、准格尔监测点的PAHs主要存在于PM2.5中,杭锦旗、柒盖淖监测点PM2.5中PAHs所占的比例不大.监测点污染程度依次为准格尔旗>棋盘锦>东胜区>杭锦旗>柒盖淖.运用比值法和多元统计技术对PAHs的来源进行了解析,东胜区主要以机动车尾气为主,且汽油车影响较大;棋盘锦、准格尔以燃煤污染为主;这3个监测点的PAHs均为本地来源.杭锦旗和柒盖淖2个监测点的PAHs为迁移而来.
PM10 and PM2.5 samples were collected at five monitoring sites in E＇erduosi and PAHs were examined with GC-MS. The PAHs with low molecular weight, such as Nap, Acy, Ace were observed in relatively low concentrations. The PAHs with high molecular weight, such as chrysene, benzo [a] pyrene, indeno[1,2,3-cd]pyrene, benzo[ghi]perylene were abundant. The PAHs were mainly found in PM2.5 in Zhungaer, Qipanjin, and Dongsheng, while they were mainly found in PM10 in Hangjin, Qigainao. The degree of PAHs pollution was ranked as： Zhungaer〉Qipanjin〉 Dongsheng〉Hangjin〉Qigainao. The ratios of PAHs and the methods of multianalysis＇were used to investigate the sources of the PAHs. The PAHs in Dongsheng were mainly infludnced by traffic, especially gasoline-powered vehicles. Coal combustions were major sources in Zhungaer and Qipanjin. The PAHs in Dongsheng, Qipanjin, Zhungaer resulted from the local source emissions, and the PAHs in Hangjin and Qigainao were attributable to long-distance transportation.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2008年第1期12-17,共6页
China Environmental Science
