王秋森2006-07-252018-06-292006-07-252018-06-292002-07-31http://ntur.lib.ntu.edu.tw//handle/246246/4583在周界大氣中，揮發性有機氣體的氧 化反應會產生能夠凝結而形成二次有機 氣膠的低揮發性有機化合物。排放自汽機 車的反應性有機氣體是都會區大氣中二 次有機氣膠前趨物質的主要來源，因此， 本研究之主要目的為探討機車排氣經光 化學反應後產生二次有機氣膠與反應性含氧物種之潛勢。已濾除微粒之稀釋機車排氣經UV 照 射後會快速產生二次有機氣膠。經照射 2-3 小時後採樣袋內之微粒數目濃度達到 尖峰。氣相反應性含氧物種則在照射5-7 小時後出現高於初始濃度約十倍以上之 尖峰濃度。此研究結果顯示在UV 照射 下，已事先濾除微粒之機車排氣具有甚高 的二次有機氣膠及反應性含氧物種之形成潛勢。Oxidation of volatile organic gases in ambient air produces low-volatility compounds that condense to form secondary aerosol particles. In urban areas, the major sources of precursors for secondary organic aerosols (SOA) are the reactive organic gases (ROG) emitted from motor vehicles. This study aims at investigating the SOA and reactive oxygen species (ROS) formation potential of diluted motorcycle exhaust. Irradiation of diluted motorcycle exhaust led to rapid formation of SOA. The particle number concentration in the bag peaked at 2-3 hours after UV irradiation. On the other hand, the gaseous ROS concentration increased with time to a peak at 5~7 hours. The peak concentration of gaseous ROS was about one-order of magnitude higher than the initial concentration in diluted motorcycle exhaust. The results suggest that the motorcycle exhaust with particles removed has a high potential to form ROS and SOA under UV irradiation.application/pdf187676 bytesapplication/pdfzh-TW國立臺灣大學公共衛生學院公共衛生學系二次有機氣膠機車排氣反應性含氧物種光化學反應secondary organic aerosols (SOA)motorcycle exhaustreactive oxygen species (ROS)photochemical reactionsreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/4583/1/902320B002174.pdf