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年度	108	專案性質	實驗性質
專案類別	研究專案	研究主題	自訂
申請機構	國立臺灣大學	申請系所	生物環境系統工程學系
專案主持人	廖秀娟	職等/職稱	教授
專案中文名稱	生態風險評估參數建置：以老街溪底泥重金屬污染為例
中文關鍵字	生態風險評估,參數建置,老街溪,底泥,重金屬
專案英文名稱	Development of ecological risk assessment indices: Using heavy metal contamination in sediments in Laojie River as a case study
英文關鍵字	Ecological risk assessment, Development of indices, Laojie river, Sediments, Heavy metal
執行金額	700,000元
執行期間	2019/1/1 至 2019/12/31
計畫中文摘要	國內重要河川底泥中含有不同污染程度的重金屬。當底泥污染物濃度超出標準時，應啟動適當之風險評估。本專案計畫於枯水期(2019年1月)以及豐水期(2019年6月)進行老街溪流域底泥採樣，並分析底泥重金屬的濃度及分佈。利用逆王水微波消化法分析底泥得知，枯水期及豐水期時，Cu、Ni、Pb、Zn在部份樣點超過底泥品質標準。由序列萃取法分析底泥得知，部份樣點Cu、Zn、Pb的可交換相、可還原相及可氧化相濃度於偏高。利用不同的污染指數，量化底泥中重金屬的污染程度，結果顯示，重金屬濃度高之樣點，與個別污染指數結果成正相關。總體污染程度指數(MCD)顯示，老街溪流域呈低至中度污染程度。評估底泥重金屬的生物效應及潛在的生態風險，結果發現，在枯水期及豐水期造成潛在生態風險比較嚴重的有Cu、Ni、Zn。各樣點的潛在生態風險指數(PERI)在枯水期中較高。風險評估編碼(RAC)顯示，Cd、Cu、Zn及Mn具有較高的生物可獲性。利用皮多變量統計方法分析發現，枯水期及豐水期，Cu、Ni、Zn為多個污染源的共同污染物，顯示此三種金屬可能來自相同來源。本專案計畫期末報告內容符合預期執行進度。
計畫英文摘要	Several major rivers in Taiwan have been reported to be contaminated by heavy metals with different degree. The sediment ecological risk assessment should be conducted while the concentrations of heavy metals exceed the upper limit of sediment quality guideline. In this final report, we have collected and analyzed sediment samples from Laojie River area in January, 2019 (dry season) and June, 2019 (raining season), respectively and analyzed the concentrations and distribution of the sediment samples. By using microwave-assisted acid digestion, the results showed that in both dry and raining seasons, Cu, Ni, Pb, Zn were the major contaminants and concentrations in some sampling sites were even higher than that of upper limit of sediment quality guideline. By using the sequential extraction approach, the results showed that concentrations of Cu, Zn, Pb in exchangeable, reducible, and oxidizable fractions in several sampling sites were very high. In addition, different pollution indices were used to quantify the degree of pollution posed by heavy metals. The results showed that several individual pollution indices are in agreement with the heavy metals concentrations in sediments in most sampling sites. Moreover, the overall contamination degree of most sampling sites showed low to moderate degree of contamination. Furthermore, ecological risk posed by heavy metals in the sediments was assessed. The results showed that in both dry and raining seasons, Cu, Ni, Zn showed highly potential ecological risk. Based on the potential ecological risk index (PERI), in general, most sampleing sites in dry season pose higher potential ecological risk than that of raining season. Risk assessment code (RAC) further indicated that Cd, Cu, Zn, Mn exhibited higher bioavailability. Finally, based on the results of multivariate statistical analyses, we deduced that Cu, Ni, Zn originated from the same anthropogenic sources within Laojie River area. This final report fulfills the expected progress.