金屬穩定同位素分析應用於環境鑑識之可行性研究(2/2)
| 中文摘要 | 本計畫為兩年期計畫，計畫第一年已成功發展鍶-釹-鉛同位素比值分析之方法，並應用於三間煉鋼廠(LC、LD、CS)之爐碴來源追蹤。本年度計畫進一步探入討鍶-釹-鉛同位素比值在爐碴來源區分之可靠性，以及掌握鍶-釹-鉛同位素訊號之來源為何。為達成此目標，已對爐碴進行時間序列(107年6月及10月)採樣與同位素分析，如此可以掌握三間工廠之鍶-釹-鉛同位素比值隨時間的變化。此外，也對煉鋼過程中所添加的副料(如：石灰、矽鐵、錳鐵、矽錳鐵、氧化鎂以及螢石)進行採樣與分析，以找出爐碴中鍶、釹、鉛之可能來源。 爐碴之分析結果顯示爐碴在不同時期之同位素比值有顯著差異，還原碴之87Sr/86Sr變化範圍為0.708269 ~ 0.709838，εNd之變化範圍為-14.2 ~ -16.0，208Pb/207Pb之變化範圍為2.4284 ~ 2.4375，206Pb/207Pb之變化範圍為1.1540 ~ 1.1736。氧化碴之87Sr/86Sr變化範圍為0.708192 ~ 0.709292，εNd之變化範圍為-15.7 ~ -16.7，208Pb/207Pb之變化範圍為2.4257 ~ 2.4385，206Pb/207Pb之變化範圍為1.1491 ~ 1.1727。以鍶-釹-鉛同位素比值可區分三間煉鋼廠之還原碴或氧化碴，達到辨別不同工廠之目的。然而對於時間序列樣品（102年、107年6月及10月），各廠之同位素比值隨時間有顯著差異，推測應與各電弧爐廠進料產地會隨時間改變有關，造成同位素比值改變。副料之同位素分析結果證實了爐碴中之鍶、釹同位素比值主要受控於石灰與矽鐵，鉛同位素比值則反映爐碴中的鉛主要受控於矽鐵/錳鐵，這些外觀看似相同之副料，因產地不同而具有不同的鍶-釹-鉛同位素比值(受控於生成時之初始元素比及形成時間)，成為區別不同廠所產生爐碴之關鍵。 綜合本研究分析結果，利用鍶-釹-鉛同位素系統來追蹤爐碴之來源是可行的，也突顯出使用多重同位素系統之重要性。然而，未來仍須建立各工廠之同位素特徵，並且掌握各工廠副料來源之變化，方能真正達到追本溯源之目的。 | ||
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| 中文關鍵字 | 鍶-釹-鉛同位素比值、環境鑑識、廢棄物 | ||
基本資訊
| 專案計畫編號 | EPA-107-E3S3-02-01 | 經費年度 | 107 | 計畫經費 | 2750 千元 |
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| 專案開始日期 | 2018/04/03 | 專案結束日期 | 2018/12/31 | 專案主持人 | 黃國芳 |
| 主辦單位 | 環檢所 | 承辦人 | 許志福 | 執行單位 | 中央研究院地球科學研究所 |
成果下載
| 類型 | 檔名 | 檔案大小 | 說明 |
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| 期末報告 | 金屬穩定同位素分析應用於環境鑑識之可行性研究(2).pdf | 6MB |
Study of the metal stable isotopes on environmental forensics (2/2)
| 英文摘要 | In the first year of this project, we have successfully developed an analytical protocol for tracing slag materials from three steel plants (i.e., LC, LD and CS) using the Sr-Nd-Pb isotope ratios. This year, we further evaluate the reliability of the combined Sr-Nd-Pb isotope approach in slags as a reliable tracer for discriminating sources of slags, and to better constrain where the Sr-Nd-Pb isotopic signals in slags come from. To do so, we collected slag samples twice from the three plants (June and October, 2018), which were used to investigate if there is any temporal varitions of Sr-Nd-Pb isotope signatures from the studied plants. Several fluxes (including lime, ferro-silicon, ferromanganese, ferromanganese-silicon, megnisium oxide and fluorite) were also sampled for identifying possible sources of Sr-Nd-Pb in slag samples. The results show that reductive or oxidative slags from the three plants can be discriminated by Sr-Nd-Pb isotope ratios. However, Isotope ratios of slags are significantly different between the samples collected in 2013 and 2018, probably due to changes in sources of fluxes through time. The measured isotope data of the fluxes indicate that Sr and Nd isotope ratios are mainly controlled by lime and ferro-silicon, and Pb isope ratios are most likely related to ferro-silicon or ferromanganese. Our results demonstrate that sources of slags can be discriminated by the combined Sr-Nd-Pb isotope ratios, and has great potential as a probe for tracing sources of slags if the databases for plants and associated fluxes can be established. | ||
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| 英文關鍵字 | Sr-Nd-Pb isotope ratios, environmental forensics, wastes | ||