title: [Pollution characteristics of n-alkanes in atmospheric fine particles during Spring Festival of 2007 in Beijing].
abstract: Research PM2.5 aerosols had been carried out with sampler of high-volume sampler during Spring Festival of 2007 in Beijing, and the concentrations of n-alkane in PM2.5 samples were determined via GC-MS. The average concentrations of PM2.5 which were all exceeded WHO threshold values were higher in the night than those in the day time. The n-alkane homolog from C10 to C33 were detected with the major peak carbon numbers ranging from 23 to 25. The total concentrations of n-alkane were higher in the night (943.5 ng x m(-3)) than those in the day time (581.1 ng x m(-3)). And also we found that the average concentrations of n-allkane before New Year's Eve (1,025.5 ng x m(-3)) were higher than those after (536.6 ng x m(-3)). The CPI values were 0.9-1.4 with average of 1.15. Those results may mean that primary resource of n-alkane in fine particles was the incomplete combustion of fossil fuel. The percent contribution of leaf "Wax" n-alkane indicated that about 8.5%-47% of n-alkane came from waxy leaf surface abrasion.
authors.affiliation: LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China. yaoli0215@163.com
authors.forename: Li
authors.initials: L
authors.lastname: Yao
authors.forename: Xing-Ru
authors.initials: XR
authors.lastname: Li
authors.forename: Xue-Qing
authors.initials: XQ
authors.lastname: Guo
authors.forename: Xin-Ran
authors.initials: XR
authors.lastname: Liu
authors.forename: Yue-Si
authors.initials: YS
authors.lastname: Wang
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000473:Alkanes / Q000032:analysis* / Q000737:chemistry; D001272:Atmosphere / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D000473:Alkanes; D052638:Particulate Matter