https://scholars.lib.ntu.edu.tw/handle/123456789/77149
標題: | 河口生態系統持久性有機物暴露途徑之研究(I)-基本資料調查與模式架構建立 Exposure Pathway in Estuarine Ecosystems (1) – Baseline information investigation and Conceptual model development |
作者: | 吳先琪 Wu, Shian-Chee |
關鍵字: | PCBs;estuary;fish;sediments;exposure route;seasonal variation | 公開日期: | 31-七月-2003 | 出版社: | 臺北市:國立臺灣大學環境工程學研究所 | 摘要: | 本研究針對二仁溪口十一個採樣點之河川底泥進行多氯聯苯、有機物組成及粒徑分布之分 析,以探討夏季降雨對河川底泥中多氯聯苯之分布濃度及型態之影響。研究結果顯示底泥中多氯 聯苯及有機物組成分別由降雨前的17.3 ng/g 及1.5﹪降至降雨後的12.6 ng/g 及1.0﹪,此兩者間 之線性相關係數由降雨前的0.87 大幅降低至降雨後的 0.54。同時多氯聯苯在河海交接處及河口 內兩處底泥之濃度及型態分布明顯不同,河海交接處之低氯數同源物在降雨後有明顯增加,推測 是暴雨逕流造成之影響。河川集水區域內之表土具有較多低氯數之同源物,當表土被暴雨逕流沖 刷至河川內,可能於河海交接處沉積,遂可能造成前述結果。 本研究同時對河口內魚體及底泥中多氯聯苯同源物進行分析,發現兩者間具有相近之濃度及 型態分布,顯示了其間有密切的食物階層關係,並反應出多氯聯苯存在於底泥與魚體間之暴露途 徑。 The distribution of the concentration of PCBs in sediments and fishes of eleven sampling sites along the ErJen estuary were investigated. The sediment properties of this tropical estuary near a former PCB contamination hot spot were also investigated before and after wet season to evaluate the effects of storm events on the seasonal variation of them and the distribution pattern of PCBs. The results revealed that the averaged PCB concentration decreased from 17.3 to 12.6 ng/g and the organic content of sediments decreased from 1.5 to 1.0 % after the wet season. The strong correlation (r = 0.87) between the organic matter content and the PCB content observed before precipitation was disappeared after the rainy season (r = 0.54). The pattern of PCB concentration in the sediments in river mouth reflected the influences of surface runoff brought by high precipitation. The concentration of the light PCBs increased while the heavy PCBs decreased after precipitation in the sediment at the river mouth. Topsoil in the catchment with relatively higher concentration of light PCBs was proposed to contribute to the change of the PCB pattern in the sediments downward the combined sewer outlet. Comparison between the patterns of PCBs in the fishes and in the sediments within the estuary revealed that surface sediments are the stable food sources of these bottom feeders. Preliminary study on the exposure route of the bottom feeder, mullet, demonstrated a strong trophic relationship between sediments and fishes. Relatively similar fingerprints of PCBs in fishes and in sediments support the hypothesis of the sediment-to-fish exposure route suggested above. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/22112 | 其他識別: | 912211E002029 | Rights: | 國立臺灣大學環境工程學研究所 |
顯示於: | 環境工程學研究所 |
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912211E002029.pdf | 164.34 kB | Adobe PDF | 檢視/開啟 |
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