Distributions and sources of n-alkanes in PM_(2.5) at urban,industrial and coastal sites in Tianjin,China

作     者：Weifang Li Yue Peng Zhipeng Bai 

作者机构：State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control College of Environmental Science and Engineering Nankai University Tianjin 300071 China. Tianjin Academy of Environmental Protection Science Tianjin 300191 China Liaoning Provincial Environmental Monitoring Center Shenyang 110031 China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2010年第22卷第10期

页      面：1551-1557页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 08[工学] 081303[工学-城市规划与设计(含：风景园林规划与设计）] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学] 0813[工学-建筑学] 

基　　金：supported by the Commonweal Project of National Environment Protection(No.200709013 200709048) the National Basic Research Program (973)of China(No.2011CB503801) 

主　　题：PM2.5 n-alkanes distribution pattern CPIs plant wax 

摘      要：Aliphatic hydrocarbons （n-alkanes） associated with fine particulate matter were determined in the ambient air of urban, industrial and coastal areas in Tianjin, China, where intensive coal burning for industrial and domestic purpose takes place, n-Alkane homologues from C12 to C35 were quantifiable in all samples with C20-C31 being the most abundant species. Average concentrations of the total n-alkanes were 148.7, 250.1 and 842.0 ng/m3 in July, April and January, respectively. Seasonal variations were mainly attributed to ambient temperature changes and coal combustion for residential heating. Among the three studied areas, the highest levels of n-alkanes were observed in the industrial complex in winter and spring, but in summer the coastal alkane concentration moved up to the highest. A mono-modal distribution for n-alkanes was observed in spring and summer with odd carbon number predominance and a maximum centered at C27-C31, suggesting the release of plant wax into the atmosphere. The bimodal distribution with maxima at C22 and C26 observed in winter indicated a substantial influence of fossil fuel sources. All the CPIs （CPI1, CPI2, CPI3） values, varying between 0.64 and 1.97, indicated the influence of anthropogenic emissions on fine organic aerosols. The estimated contributions of plant wax to total n-alkanes were on average of 12.9%, 19.1% and 26.1% for winter, spring and summer, respectively.