Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/5837
標題: 台中都會區空氣懸浮微粒的特性 - 2008至2010年案例探討
Characteristics of Airborne Particulates in Taichung Urban Area A case study from 2008 to 2010
作者: 吳泳鴻
Wu, Yung-Hong
關鍵字: 懸浮微粒;Taichung urban area;沙塵暴;Asian dust storm events
出版社: 環境工程學系所
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摘要: 
空氣中懸浮微粒主要來自人為污染及自然排放,其粒徑分佈與化學組成影響能見度、氣候及民眾的身體健康,因此本研究主要探討2008年1月至2010年12月,空氣中懸浮微粒的組成及特性,實驗分析部分則利用雙粒徑分道採樣器,在臺中市中興大學土木環工大樓頂樓採集懸浮微粒樣本,並分析其水溶性陰陽離子成份,另外整合大里、西屯、沙鹿、忠明及豐原空氣品質觀測站數據以輔助分析。此研究之目的主要為了解台中都會區空氣污染物特性及沙塵暴期間與中部空氣懸浮微粒質量濃度的變化。
根據中興測站2008-2010年的採樣數據,台中都會區PM10質量濃度年均值為51.6μg/m3,其中PM2.5質量濃度為31.7μg/m3及PM2.5-10質量濃度為19.8μg/m3,PM2.5/ PM10質量濃度比值為0.6。水溶性離子方面PM10以SO42-年均值7.9μg/m3最高, NO3-年均值4.8μg/m3次之,其後為NH4+年均值4.2μg/m3。而PM2.5以SO42-年均值7.1μg/m3最高,NH4+年均值3.9μg/m3次之,其後為NO3-年均值2.6μg/m3。PM2.5-10以NO3-年均值2.1μg/m3最高,SO42-年均值0.8μg/m3次之,其後為Na+年均值0.7μg/m3。綜合量測結果可知台中都會區懸浮微粒以細粒居多。
2008-2010年觀測期間,共有七波大陸沙塵暴傳輸經過台灣,本研究根據大里、西屯、沙鹿、忠明及豐原等空氣品質觀測站的監測數據分析PM10濃度變化, PM2.5-10濃度較非沙塵事件日增加3.3倍,PM2.5-10在PM10中所佔比值從非事件日的37%增加至53%,除此之外,中興大學測站於採樣PM10的分析數據顯示PM2.5-10中K+、SO42-、NO3-分別為非事件日的2.0、1.9及1.6倍,Ca2+、Cl-、Mg2+及Na+分別為非事件日的4.5、2.3、1.7及1.5倍,沙塵暴期間地殼物質Ca2+離子有顯著的增幅。

Airborne particulates were mainly derived from natural and anthropogenic emission sources. The size distribution and chemical compositions of particulate matters can affect visibility, climate and human health . Therefore in this study, aerosol samples were collected by using dichotomous samplers from January 2008 to December 2010 in Taichung urban area. The chemical compositions of the samplers were also analyzed in order to investigate the characteristics and sources of particulates. In addition, the data measured by the air quality monitoring stations at Dali, Situn, Shalu, Jhangming and Fongyuan were also analyzed. Main objective was to understand the characteristics of air pollutants in Taichung urban area, as well as the air quality during the dust storm episodes.

The results showed that the annual average mass concentrations of PM10 and PM2.5 were 51.6μg/m3 and 31.7μg/m3, respectively. The ratio of PM2.5/PM10 was 0.6. SO42-, NO3- and NH4+ were the major ionic species of the particulates which indicated that the ambient particulates were dominated by fine particles and secondary aerosols. During the Asian dust storm events, the concentrations of PM2.5-10 were higher than the non-dust storm periods. Na+, Cl-, Mg2+ and Ca2+ were higher as compared to those in the non-dust storm events. Therefore the major increased contents in the dust storm events were coarse particle, sea salt and crustal elements.
During the sampling period in central Taiwan, there were seven significant dust events observed in the period, The results indicated that the coarse particles were dominant in the dust episodes. The mean concentrations of PM2.5-10,K+,SO42-and NO3- were 3.3、2.0、1.9 and 1.6 times higher than those in the non-dust days, respectively. However , the concentrations of Ca2+,Cl-,Mg2+及Na+were 4.5、2.3、1.7 and 1.5 times higher . This result indicated that the dust storm brought the soil components to Taiwan so that Ca2+ increased significantly.
URI: http://hdl.handle.net/11455/5837
其他識別: U0005-1308201318113400
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