請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/5515
標題: 利用TOR方法分析台中都會區懸浮微粒中元素碳和有機碳的特性
作者: 蔡明杰
Chieh, Tsai Ming
關鍵字: 元素碳
EC
有機碳
熱反射比
OC
TOR
出版社: 環境工程學系
摘要: 摘 要 本研究於2002年2月至2003年12月使用雙粒徑分道採樣器採集台中地區的大氣懸浮微粒(PM2.5、PM2.5-10),並利用TOR(thermal optical reflectance)技術分析微粒樣本的元素碳(EC)及有機碳(OC),研究目的主要探討不同事件日及一般日之懸浮微粒濃度及其所含元素碳及有機碳含量,並分析其季節性變化及不同事件日及一般日之懸浮微粒含碳特性。 採樣期間主要有兩種不同類型的高污染懸浮微粒事件,第一種為大陸沙塵事件,其明顯影響的案例於2002年共有8件,2003年則有2件,第二種為農廢燃燒事件,發生的日期為2002年11月27日,此空氣高污染事件為中部地區歷年來最嚴重的農廢燃燒事件。研究結果顯示大陸沙塵事件其長程傳輸至中部地區的微粒所含含碳物質的特性與本地並無明顯差異,10次沙塵事件期間量測之PM10和PM2.5的平均OC/EC比值分別為3.6及2.7,與非事件日期間之平均比值3.6及2.9相近,然而農廢燃燒事件大氣懸浮微粒PM10和PM2.5的OC/EC比值皆高達4.4,尤其PM2.5微粒中含碳物質高達43.2%,比非事件日期間PM2.5的含碳比值高1.3倍。有機碳含原生性OC及二次光化產生之OC,本研究係利用最小比值法推估PM2.5中二次有機碳濃度,由2002年3月至2003年02月期間的數據顯示,年平均二次有機碳佔總有機碳43.0±14.3%,而夏季陽光強且溫度高,二次有機碳佔總有機碳之比值最高其值為51.5±15.3%,冬季則最低為37.9±17.2%。
Abstract PM2.5 and PM2.5-10 samples were collected on pre-fired quartz filters with a dichotomous sampler in Taichung city during the period from February 2002 to December 2003. The samples were analyzed for elemental carbon (EC) and organic carbon (OC) by using a thermal optical reflectance (TOR) method. The purpose of this study was to investigate the characteristics of EC and OC particulates during several PM10 episodes. The data were also analyzed for further understanding the seasonal variations of the carbonaceous particulates. Two types of PM10 episodes which included the Asian dust-storm event and the rice-straw waste burning event were observed during the sampling period. Totally there were eight dust events occurred in 2002 and two dust events in 2003. The rice-straw waste burning event, occurred on November 27 in 2002, which was the most serious PM10 episode ever happened in the central Taiwan. The data showed the long-range transported carbonaceous particulates from mainland China to the central Taiwan were not remarkably different form the local ambient aerosols. The average OC/EC in PM10 and PM2.5 during the dust-storm events were 3.6 and 2.7, respectively. These results were similar to those in the non-dust events. However, OC/EC ratio had reached 4.4 in the rice-straw burning event. Large amount of the carbonaceous contents accounted for 43.2% of PM2.5, which was 1.3 times higher than the annual average data. Since the organic carbon consisted of the primary and the secondary aerosols, a minimum OC/EC method had been applied to estimate the concentrations of the secondary organic carbon (OCsec). The results showed the annual average OCsec accounted for 43.0% of total organic carbon. The highest percentage of OCsec was found to be 51.5% in summer, and the lowest (37.9%) was observed in winter.
URI: http://hdl.handle.net/11455/5515
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