摘要
使用GC×GC-TOFMS仪器对北京2016年11月雾霾和非雾霾期采集的颗粒物中正构烷烃(C10-C36)进行了定量分析,并且对其分布特征和污染来源进行了分析.结果表明,北京市大气颗粒物中正构烷烃在雾霾天的含量明显高于非雾霾天,浓度分别为591 ng/m3和270 ng/m3.支链烷烃与正构烷烃具有一致的分布规律,在雾霾天也具有较高的浓度,且主要分布在碳数为C19-C28范围内.根据正构烷烃(C10-C36)的碳优势指数(CPI、CPI1和CPI2)结果,可知雾霾和非雾霾期间,北京市大气气溶胶中正构烷烃主要由人为源(汽车尾气、化石燃料燃烧等)排放产生,而植物来源相对贡献较小.植物蜡分布(WAX%)的结果表明,生物源在雾霾和非雾霾天对气溶胶中正构烷烃的贡献率分别为22%和12%.雾霾期间与非雾霾期间相比,生物源对正构烷烃的贡献相对较大.
The n-alkanes (C10-C36) were quantified in the PM2.5 from Beijing sampled in haze and nonhaze days during november 2016 and analyzed using two-dimensional gas chromatography coupled to timeof- flight mass spectrometry (GC x GC-TOFMS). n-Alkanes (C10-C36) were abundant in the samples during the sampling campaign, and the concentrations of n-alkanes at haze conditions were significantly higher than that of non-haze period, and the concentrations were 577 and 264 ng/m^3, respectively. The branched n-alkanes which had a similar variation to that of n-alkanes have higher concentrations during haze days, and abundant in the range of (C19-C28). According to the values of carbon preference index CPI (CPI, CPI1, CPI2) values, it can be concluded that n-alkanes (C10-C36) were both of biogenic and anthropogenic characteristics. The percent contribution of leaf“wax”n-alkanes indicated that about 22% and 12% of nalkanes came from waxy leaf surface abrasion during haze and non-haze days, suggesting that the biogenic imputing in haze days have a higher contribution than non-haze days.
作者
吕瑞鹤
吴建会
冯银厂
傅平青
Lu Ruihe;Wu Jianhui;Feng Yinchang;Fu Pingqing(State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350;State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029)
出处
《南开大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第6期87-93,共7页
Acta Scientiarum Naturalium Universitatis Nankaiensis
基金
中国特大城市大气污染及其对人体健康的研究(NE/N007190/1).
作者简介
吕瑞鹤(1983-),男,内蒙古包头人,博士研究生;通讯作者:吴建会(1978-),男,山东新泰人,副教授,研究方向:环境空气污染防治,空气颗粒物源解析.E-mail:envwujh@nankai.edu.cn
