頁籤選單縮合
題 名 | Sources and Deposition Fluxes of PCDD/Fs in the Largest Reservoir System in Taiwan before and after Typhoon Morakot |
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作 者 | Chi, Kai Hsien; Luo, Shangde; Kao, Shuh Ji; Hsu, Wei-ting; Lee, Tzu Yi; | 書刊名 | Aerosol and Air Quality Research |
卷 期 | 15:4 2015.08[民104.08] |
頁 次 | 頁1227-1239 |
分類號 | 445.6 |
關鍵詞 | Dioxin; Core; Sediment; Atmosphere; Pentachlorophenol; |
語 文 | 英文(English) |
英文摘要 | The Tsengwen Reservoir (TWR) is positioned at 23°16′N, 120°34′E and is the largest reservoir in Taiwan. During 2009 to 2010, deposition flux of polychlorinated dibenzo-p-dioxin and dibenzofuran (PCDD/F) in atmosphere, water bodies and sediments were measured in the TWR area for this study. The monthly ambient air PCDD/F deposition in the surrounding area of the TWR was found to range from 0.206 to 2.43 pg I-TEQ/m2 /day. In addition, the PCDD/F levels (11 to 12 fg I-TEQ/L) in the shell water (water depth: 0.5 m) were found to be uniform and well mixed within the upstream, central and lower reaches of the TWR. The PCDD/F input flux into the reservoir was investigated in two sediment cores sampled at the TWR. The year dating within the sediment cores at different depths was projected from the sedimentation rate (> 17 cm/y) and calculated by 210Pb analysis. The PCDD/F content within the sediment cores at different depth were 0.136 ng I-TEQ/kg d. w. to 0.413 ng I-TEQ/kg d. w. Before the Morakot typhoon event (June, 2009), the PCDD/F concentration of the surface sediments were 0.091 to 0.187 ng I-TEQ/kg d. w. as detected at the upstream, central and lower reaches of the TWR. Interestingly, the PCDD/F content (0.132 to 0.222 ng I-TEQ/kg d. w.) of surface sediments increased somewhat after typhoon event (January, 2010). During the severe typhoon periods, the PCDD/F input contributed by the enhanced catchment landslides dramatically increased to 99%. |
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