頁籤選單縮合
題名 | Characteristics and Receptor Modeling of Atmospheric PM2.5 at Urban and Rural Sites in Pingtung, Taiwan |
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作者 | Wang, W. C.; Chen, K. S.; Chen, S. J.; Lin, C. C.; Tsai, J. H.; Lai, C. H.; Wang, S. K.; | 書刊名 | Aerosol and Air Quality Research |
卷期 | 8:2 2008.06[民97.06] |
頁次 | 頁112-129 |
分類號 | 445.63 |
關鍵詞 | PM2.5; Water-soluble ions; Carbonaceous species; Receptor modeling; CMB analysis; |
語文 | 英文(English) |
英文摘要 | Suspended particles of PM2.5 in air were sampled concurrently at an urban site and a rural site in Pingtung County in southern Taiwan, in the spring, the summer and the fall of 2005. All samples were analyzed to identify eight water-soluble ions, carbonaceous contents, and 19 metal elements. Measurements reveal that the overall means of PM10 (and PM2.5) are 59.2 (47.4) μg/m3 at Pingtung (urban) site, and 63.6 (45.7) μg/m3 at Chao-Chou (rural) site. Although both sites exhibited strong correlations (R = 0.98 at Pingtung, and R = 0.78 at Chao-Chou) between PM10 and PM2.5 masses, the mean PM2.5/PM10 ratio was 0.81 at Pingtung, higher than 0.68 at Chao-Chou, suggesting that relatively large bare lands and outdoor burning on farms may have caused more coarse particles to be present in PM2.5 at a rural site (Chao-Chou) than at an urban site (Pingtung). Results of CMB (chemical mass balance) modeling show that the main contributors to PM2.5 mass at Pingtung are vehicle exhaust (49.3–62.4%) and secondary aerosols (SO42–, NO3– and NH4+) (31.2–37.8%), while those at Chao-Chou are the outdoor burning (25.3–50.4%) of agricultural waste, secondary aerosols (27.2–34.3%) and vehicle exhaust (12.0–26.9%), depending on the seasons. |
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