請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/5219
標題: PM2.5及PM2.5-10氣膠化學組成量測及應用逆軌跡模式分析其污染來源
Measurements of Chemical Compositions of PM2.5 and PM2.5-10 Particulates and the Application of Backward Trajectory Model on the Analysis of Pollutant Sources
作者: 周韋均
Chou, Wei-Chun
關鍵字: backward trajectory
逆軌跡模式
emission attraction rate
PM10
sulfate
nitrate
污染物吸納量
PM10
硫酸鹽
硝酸鹽
出版社: 環境工程學系所
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摘要: 本研究利用雙粒徑分道採樣器於2005年4月3至9日與9月15至21日在中部內陸地區(南投及霧峰測站)採集PM2.5及PM2.5-10氣膠微粒,並以離子層析儀、元素分析儀分析氣膠化學組成,再利用逆軌跡模式評估鄰近縣市對於受體點測站的PM10及其前驅物的相對貢獻程度。 研究結果顯示南投測站4月份平均PM10濃度為109.6μg/m3,約為霧峰測站的1.2倍,而9月份則以霧峰測站濃度較高約為77.4μg/m3,微粒的組成均以細微粒為主。氣膠的化學組成特性上,兩測站以硫酸鹽、硝酸鹽、銨鹽及含碳物質為主要的化學物種,且懸浮微粒高污染期間,南投及霧峰測站PM10之硝酸鹽微粒分別由低污染時的9%及7%,上升至高污染時的13%及20%,硝酸鹽所佔比例明顯增加,而其他的物種則差異不大,顯示硝酸鹽為內陸地區造成懸浮微粒高污染時的主要污染物種,其推測可能是受到交通污染源的影響,另外在軌跡類型分析上,由東北方傳輸而來的氣團因沿途經過台中都會區及沿海工業區等污染源密集的區域,導致南投及霧峰測站的硫酸鹽及硝酸鹽濃度均有明顯的上升。 利用逆軌跡模式推估南投及霧峰測站的污染物(NOX、SO2及原生性PM10微粒)吸納量與其實際量測的PM10濃度值均有良好的相關性,其相關係數分別為0.72及0.73。而在PM10事件日時,南投測站來自於台中縣市的原生性PM10微粒、NOX及SO2明顯較非事件日增加了25%、18%及10%,而霧峰測站則增加31%、35%、42%。並利用此推估方法分析台中測站2005年4月13日至22日之案例,其結果顯示台中測站仍以本地污染源貢獻為主。
Dichotomous samplers were used to collect PM2.5 and PM2.5-10 aerosols at Nantou and Wufeng in the inland area of central Taiwan during the periods from 4/3-4/9 and 9/15-9/21 in 2005, The chemical compositions of samples were analyzed by ion chromatograph and elemental analyzer. Further more we used trajectory model to evaluate the relative contributions of PM10 and the precursor pollutants from adjacent county to the sampling sites. Results showed the average concentration of PM10 at Nantou site in April was 109.6μg/m3, which was about 1.2 times of that at Wufeng site. However the concentration at Wufeng site in September was 77.4μg/m3 which was higher than those at Nantou site, PM2.5 concentrations were usually greater than those of PM2.5-10. The major chemical components of these aerosols were sulfate, nitrate, ammonium and carbonaceous components. During the period of particulate episodes, the percentage of nitrate in PM10 at Nantou and Wufeng sites raised from 9% and 7% to 13% and 20%, respectively. The significant increase of nitrate showed that nitrate was the primary component increased during the high pollution periods in the inland area. The source of the nitrate particulates might come from the vehicle emissions. Furthermore, the pattern of the trajectory indicated that the air mass from north east, the intensively polluted area, led to the increase of sulfate and nitrate at Nantou and Wufeng sites. We utilized the trajectory model to analyze the pollutants emission attraction rates of Nantou and Wufeng sites, and compared the PM10 concentrations. The correlation coefficients between the simulation and the observed PM10 concentrations at these two sites were 0.72, 0.73, respectively. The relationship between the sources and the three receptors showed that the primary particulate (PM10), NOX and SO2 were apparently raised by 25%, 18%, 10% and 31%, 35%, 42% from Taichung county in Nantou and Wufeng sites as compared with non-episodes. And we employ the method to analyze the case in the Taichung site from 13th to 22nd April, results the local emissions were the major sources of Taichung site.
URI: http://hdl.handle.net/11455/5219
其他識別: U0005-2806200616505700
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2806200616505700
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