碩士 / 國立臺灣海洋大學 / 海洋環境資訊系 / 106 / The present study used the sequential extraction method published by Tessier et al.(1979) to analyze the concentrations of trace metals in sediments of the Taiwan estuarine mouth and the Taiwan Strait and to understand the spatial distribution and the pollution status of the analyzed trace metals. The sequential extraction method divides the concentrations of trace metals in sediments into five fractions, namely: (1) exchangeable; (2) bound to carbonates; (3) bound to Fe-Mn oxides; (4) bound to organic matter and (5) residual.
The concentration ranges of trace metals in the analyzed sediment samples were as follows: Al, 2.923-9.478 %; Co, 6.65-25.28 mg/kg; Cr, 23.48-142.93 mg/kg; Cu, 6.97-146.83 mg/kg; Fe, 1.139-5.065 %; Mn, 188.15-1170.38 mg/kg; Ni, 16.47-48.91 mg/kg; Pb, 11.51-32.96 mg/kg; Zn, 29.40-186.09 mg/kg; Hg, 11.52-96.13 g/kg. The average concentration of trace metals, except Cu, in sediments of the Northern Taiwan Strait were generally higher than that of the Taiwan estuarine mouth. The reason for this is probably that the sediments of the Northern Taiwan Strait were mostly the clay and contained a relatively higher concentration of organic carbon. The enrichment factor and geo-accumulation index were employed to identify the contamination status of trace metals in the analyzed sediment samples. The calculated results suggest that the analyzed sediment samples were mildly contaminated by Co, Cr, Ni and Hg, the other elements were not contaminated.
Based on the fractionation contribution of trace metal in sediments, the studied elements can be classified into three groups: Al, Co, Cr, Cu, Fe, Ni, Zn and Hg mainly dominated in the residual fraction; Pb mostly present the Fe-Mn oxides fraction; and Mn dominated in the carbonates fraction.
| Identifer | oai:union.ndltd.org:TW/106NTOU5276009 |
| Date | January 2018 |
| Creators | Huang, Zih-Ting, 黃子庭 |
| Contributors | Fang, Tien-Hsi, 方天熹 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 76 |
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