北京地区大气中VHCs观测结果的初步分析  

THE PRELIMINARY STUDY ON MEASURED RESULTS OF AMBIENT VHCs IN BEIJING AREAS

作　　者：王木林[1] 程红兵[1] 丁国安[1] 

机构地区：[1]中国气象科学研究院中国气象局大气成分观测与服务中心

出　　处：《应用气象学报》2005年第5期600-607,共8页Journal of Applied Meteorological Science

基　　金：国家基础研究发展规划项目(TG1999045700);科技部国际科技合作重点项目(2004DFA06100)共同资助

摘　　要：采用Tenax TA和碳分子筛吸附富集-热脱附-毛细管柱气相色谱法,测定了北京地区大气中C2～C10可挥发性烃类化合物(简称VHCs)的浓度变化.从2001年9月到2003年8月,先后采集到有效样品113个.检出55个VHCs 组分,其中烷烃26个,烯烃19个,芳香烃10个.TVHCs的平均浓度为364.3±99.3 μg/m3;11月份浓度最高,为546.9±353.5 μg/m3,8月份浓度最低,为251.8±152.4 μg/m3;采暖季比非采暖季高30%,城区比郊区高10%;有明显的日变化.初步分析发现,机动车尾气排放和天气气象条件是造成北京地区大气VHCs污染的两个最主要因素.The variation of atmospheric concentration of C2-C10 volatile hydrocarbon compounds （VHCs） is measured out in Beijing areas using Tenax TA and Carbosieve sorption-thermodessorption-capillary gas chromatography. 113 samples are collected during the period of September 2001 to August 2003. 55 VHCs Species are detected including 26 alkanes, 19 alkenes and 10 aromatics. The average mass concentration of VHCs is 364.3 ± 99.3 μg/m^3. The seasonal peak value is 546.9 ± 353.5 μ/m^3 which appears in autumn. The valley value appears in summer which is 251.8 ± 152.4μg/m^3. The VHCs average concentration is 30% in the heating season more than that in the non-heating season. The average concentration in the urban area is 10 % higher than that in the suburbs. There are the significant daily variations of VHCs in Beijing. Results show that the polluted levels of ambient air depended mainly on the vehicle emissions and the meteorological conditions.

关 键 词：热解吸 毛细柱气相色谱法 挥发性烃类化合物 时空变化 北京地区 观测结果 大气 毛细管柱气相色谱法 机动车尾气排放 浓度变化 

分 类 号：X831[环境科学与工程—环境工程]