燃煤烟尘和机动车尾气中PAHs分子化合物的稳定碳同位素研究  

Research on Carbon Isotopic Compositions of Individual PAH in Vehicle Exhaust and Soot of Coal Combustion

作　　者：彭林[1] 白志鹏[1] 朱坦[1] 冯银厂[1] 徐永昌[2] 李志勇[1] 

机构地区：[1]南开大学环境科学与工程学院 [2]中国科学院兰州地质研究所,兰州73000

出　　处：《中国矿业大学学报》2005年第2期218-221,共4页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(20307006)

摘　　要：研究了燃煤烟尘中和机动车尾气中9种多环芳烃分子化合物的稳定碳同位素组成.气相色谱/燃烧系统/同位素质谱(GC/C/IRMS)分析表明,汽油车和柴油车尾气中多环芳烃的稳定碳同位素组成相差不大,分别为-22.1‰～-23.7‰和-20.5‰～-24.4‰,并随着分子量的增大而增加.电厂燃煤和高效民用锅炉燃煤产生的多环芳烃分子化合物的稳定碳同位素组的范围为-22.0‰～-31.2‰,随着分子量的增大PAHs分子化合物中13　C含量降低.机动车尾气和燃煤产生的三环和四环多环芳烃的稳定碳同位素组成差别不大,而五环和六环化合物的稳定碳同位素组成差别比较明显。因此,利用多环芳烃分子化合物的碳同位素组成能够较好的区分燃煤产生的烟尘中和机动车尾气中苯并(a)芘,茚并(1,2,3-cd)芘,苯并(ghi)的来源.Samples of vehicle exhaust and coal combustion soot were collected in Taiyuan. δ 13C values of 9 molecular compounds of polycyclic aromatic hydrocarbons (PAHs)extracted from the samples were determined with GC-C-IRMS. The δ 13C values of PAHs from gasoline combustion are concordant with those from diesel combustion, ranging from -22.1‰～-23.7‰ and -20.5‰～-24.4‰, respectively. The PAHs become more enriched in 13C with the increase of molecular weight. The δ 13C values of PAHs from coal combustion in power plant are similar to those of domestic high efficiency coal combustion, ranging from -22.0‰ to -31.2‰ and PAHs decreases in 13C with the increase of molecular weight. The δ 13C values of 3,4-ring PAHs from vehicle exhaust are similar to those of coal combustion soot with 5,6-ring PAHs being obviously different. Therefore, the sources of benzo (a) pyrene, indeno(1,2,3-cd)pyrene and benzo(ghi)perylene from vehicle exhaust and coal combustion soot can be traced by means of carbon isotopiccompositions of individual compounds.

关 键 词：机动车尾气 多环芳烃 烟尘 燃煤 稳定碳同位素 PAHS 煤烟 化合物 组成 环化 

分 类 号：TD94[矿业工程—选矿] X701[环境科学与工程—环境工程]