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標題: 台中都會區大氣懸浮微粒長期觀測之研究
Long-term observation of ambient particulate matters in Taichung urban area
作者: 王曉玲
Wang, Hsiao-Ling
關鍵字: secondary aerosols;二次氣膠;agricultural waste burning;Asian dust storm;農廢燃燒;沙塵暴
出版社: 環境工程學系所
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大氣懸浮微粒主要源自自然排放及人為污染排放,其化學組成和粒徑分佈影響能見度、氣候及民眾的健康,因此本研究於2002 ~ 2008年期間以雙粒徑分道採樣器採集台中都會區之懸浮微粒樣本,並分析其成份,以瞭解空氣污染特性與其來源。
研究結果顯示,PM10年均值為63.9 ± 31.0 μg m-3,其中PM2.5/ PM10比值為0.64,並以SO42-、NO3-以及NH4+所佔比例最高,顯示大氣懸浮微粒以細微粒及二次氣膠的生成貢獻為主。在事件日的分析上,4次農廢燃燒事件期間,PM2.5中的Cl-、K+、NO3-、OC及EC為重要特徵污染物,並分別為非事件的10.3、6.4倍、4.7、4.2和3.2倍。此外,11次的沙塵暴事件日中,PM2.5-10質量濃度為非事件日之2.0 ~ 3.3倍,且海鹽飛沫的Na+、Cl-和地殼物質中的Mg2+及Ca2+依序為非事件日的0.7 ~ 3.2倍、1.1 ~ 5.1倍、1.0 ~ 3.6倍及1.0 ~ 5.2倍,故沙塵事件期間,粗粒、海鹽和地殼元素為主要的量測指標,最後總結量測結果,可知農廢燃燒和沙塵為造成懸浮微粒高污染事件的主因,平日則以衍生性氣膠為主要貢獻源。

Atmospheric particulates were mainly derived from natural and anthropogenic emission sources. The chemical compositions and size distributions of particulate matters can affect visibility, climate and human health . Therefore in this study, aerosol samples were collected by using dichotomous samplers from 2002 to 2008 in Taichung urban area. The samplers were then further analyzed to determine the chemical compositions in order to investigate the characteristics and sources of particulates.
The results of this study showed that annual mean concentration of PM10 was 63.9 ± 31.0 μg m-3. The ratio of PM2.5/PM10 was 0.64. SO42-, NO3- and NH4+, were the major species of the particulates which indicated that the ambient particulates were dominated by fine particles and secondary aerosols. During the sampling period, there were 4 agricultural waste burning events. During these events, Cl-, K+, NO3-, OC and EC in PM2.5 were the important marking pollutants. Their concentrations were 10.3 , 6.4 , 4.7 , 4.2 and 3.2 times higher as compared to those in the normal days. Furthermore, there were totally 11 Asian dust storm events. In these events, the concentrations of PM2.5-10 were 2.0 ~ 3.3 times higher than the non-dust storm periods. Sea-salt species Na+ , Cl- and crustal species Mg2+ and Ca2+ were 0.7 ~ 3.2 , 1.1 ~ 5.1 , 1.0 ~ 3.6 and 1.0 ~ 5.2 times 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 element. In conclusion, agricultural waste burning and dust storm were the major causes for high pollution. But in normal days, the secondary aerosols were the major sources.
其他識別: U0005-1908200921463300
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