大气中碳氢化合物来源的分析研究

1989年秋至1990年春夏季,对北京城郊大气进行了非甲烷总烃(NMHC)及C2—C11分类测定。测点以交通路口为主,对汽车尾气排放情况作了重点研究,观测了典型路口西单安全岛空气中NMHC等浓度日变化;分析了这些路口空气中总烷烃(甲烷除外)与总烯烃等比值(Alkane/Alkene),并与某些固定源及郊区清洁点的比值进行了比较。一般而言,北京环境大气中Alkane约占NHHC60％,与世界主要大城市相当;Alkene约占21％,略高;总芳香烃(Alkyne)约占19％,比上述城市都低。 

The Research of Sources of Hydrocarbon Compounds in Ambient Air

Ambient air concentrations of nonmethane hydrocarbon (NMHC) and Specific C2-C11 hydrocarbons (HCs) are reported fpr various days during the fall of 1989 and the spring and summer months of 1990. Main samples were collected nearby traffic crossings of urban and polluted rural. The diuranl variations of NMHC and individual HCs compound were observed at Xidan crossing site.The Alkane/Alkene ratio at the rural sites exceeded that fo the urban sites, and it was concluded that the major contribution to HCs at the former sites was advectipn front distant sources. The comparison was made with other cities. In ' general, Alkane/NMHC of Beijing air is similar to that of cities in Australia and United States. Alkene/NMHC is a little higher and Alkyne/NMHC is lower than that in those cities.