臺灣博碩士論文加值系統

本研究使用連續萃取法分析基隆港表層沉積物中不同相，包括水溶相、胃酸可溶相、有機螯合項、元素汞相與硫化汞相之汞濃度；此外也分析總汞濃度，以瞭解汞在基隆港空間分布、污染情形及影響汞分布之機制，各相萃取液中之汞濃度分析，係使用冷蒸氣原子螢光儀及汞齊濃縮設備。
基隆港表層沉積物中之總汞濃度範圍為106-1918 ng/g，濃度分布以內港田寮河及旭川河口處濃度最高，整體濃度由內港向外港遞減。各測站總汞濃度大部分皆高於NOAA(Long et al., 1995)所訂定對生物致病機率最低影響濃度值(effect range low, 150 ng/g)，顯示出基隆港沉積物汞污染情形不可忽視。而各相汞濃度分布比例：水溶相占0.06-6.17%；胃酸可溶相<0.49 %；有機螯合相為9.56-51.85 %；元素汞相為9.92-61.76 %；硫化汞相為7.05-64.28 %。各相汞濃度平均百分比排序為硫化汞相>元素汞相>有機螯合相>水溶相>胃酸可溶相，可能是受到基隆港內溶氧量低所影響。

The present study used the sequential extraction method to chemically separate the mercury in surface sediments from the Keelung Harbor into five species: water soluble; ‘human stomach acid’ soluble; organo-chelated; elemental Hg; and mercuric sulfide. In addition, the total concentrations of Hg in sediment samples were also analyzed. The concentrations of Hg in the extracted solutions were determined by the cold vapor atomic fluorescence spectrometry method.
The total concentrations of mercury in surface sediments of the Keelung Harbor ranged within 106-1918 ng/g. The spatial distribution exhibited higher concentrations located in the river mouth within the harbor and the concentration decrease seaward along the channel. The total concentrations of mercury at the most studied stations exceeded the NOAA guideline value of incidence of adverse biological “effect range-low” (150 ng/g, Long et al., 1995). This result provides a warming signal that the Keelung Harbor has been contaminated by Hg. The percentage ranges of different species of Hg were as follows: water soluble, 0.06~6.17%; ‘human stomach acid’ soluble, <0.49%; organo-chelated, 9.56~51.85%; elemental Hg, 9.92~61.76% and mercuric sulfide, 7.05~64.28%. The fraction of mercuric sulfide dominated the Hg concentration in the Keelung Harbor, probably attributing to anaerobic
environment within the harbor.

中文摘要 I
英文摘要 II
目錄 III
表目錄 V
圖目錄 VI
第一章 緒論 1
1-1 文獻回顧 1
1-2 研究目的 9
第二章 研究區域 10
第三章 研究方法 15
3-1 沉積物採樣 15
3-2 樣品分析方法 15
3-2-1 樣品前處理 15
3-2-2 粒徑分析 19
3-2-3 總有機碳分析 19
3-2-4 總汞分析 20
3-2-5 汞之五相連續化學萃取分析 24
3-3 分析數據品質評估 28
第四章 結果與討論 30
4-1 表層沉積物汞濃度分佈 30
4-2 基隆港沉積物汞之五相連續萃取 35
4-3 顆粒粒徑和總有機碳及其與汞之相關性 44
第五章 結論 50
參考文獻 52
附錄 59

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