Emissions of C₂ – C₁₂ hydrocarbons in the Hsuehshan tunnel, Taiwan

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• 作者：Chia-Hsiang Lai ; ^a ; ^{chlai2@ctust.edu.tw"" rel=""nofollow} ; Yen-Ping Peng^a
• 关键词：tunnel ; non-methane hydrocarbons ; vehicle emissions ; shaft ; rate
• 刊名：Journal of Environmental Sciences
• 出版年：2011
• 出版时间：June 2011
• 年：2011
• 卷：23
• 期：6
• 页码：941-948
• 全文大小：157 K

文摘

The concentrations of 56 hydrocarbons from C₂ to C₁₂ were measured simultaneously in the southbound bore, the northbound bore and the exhaust air shafts of the Hsuehshan tunnel near Yilan, Taiwan for 12 days during 2007 and 2008. A total of 60 integrated air samples were collected using stainless steel canisters and analyzed using GC/FID and GC/MS. The five most abundant species in all samples were ethylene, acetylene, isopentane, propylene and toluene. The exit/entrance ratios of total non-methane hydrocarbons (NMHC) concentration were 7.8 and 4.8 for the southbound and northbound bores, respectively. Furthermore, the exhaust from the vertical shafts affects air quality in the neighborhood. The most abundant species of emission rate (ER) was toluene (21.93–42.89 mg/sec), followed by isopentane, ethylene, propylene and 1-butene, with ER ranging from 2.50 to 9.31 mg/sec. The species in the three exhaust air shafts showed that the reactivities of these emissions are similar to those of vehicle emissions. Notably, the control of emissions in the vertical shafts of the vehicle tunnel will be important in the future.