究主要探討沉積物砷及汞分佈與污染程度，並了解沉積物中砷、汞全量與物種分佈之控制因子。研究區域包括高屏溪河口、高屏峽谷以及台灣西南部兩大主要潟湖－七股潟湖與大鵬灣。
研究結果顯示，高屏溪河口表層沉積物砷與汞主要存在於富含有機質之泥質沉積物(黏土+粉砂)，且明顯易與鐵及錳之氧化物共沉澱於沉積物中。高屏溪河口表層沉積物砷及汞於季節上分佈差異主要受到沉積物顆粒效應及有機碳的控制。
峽谷表層沉積物砷濃度分佈隨泥質顆粒含量及有機碳濃度的變化而改變，亦與鐵、錳氧化物分佈密切相關。高屏峽谷內各測站均有砷的富集現象，但富集程度變化不大。高屏峽谷表層沉積物汞於最接近高屏溪河口處有明顯富集現象，且峽谷內汞分佈可能受到高屏溪河口輸出及沉積效應所影響，因此表層沉積物汞濃度隨著離岸越遠而有遞減趨勢。由岩心的沉積與富集程度顯示出，高屏峽谷現代沉積物均有明顯砷及汞污染現象，且其顯著污染的年代大約始於1970年左右，可能與當時台灣正積極於發展石化工業等污染性產業有關，高屏峽谷亦可能為污染物儲匯場所。
潟湖表層沉積物砷及汞濃度分佈變化相似，明顯受到七股溪與大寮排水道輸出污染物的影響，但與高屏溪河口具有相同的調控機制。大鵬灣表層沉積物砷的分佈則因受於最內灣鐵、錳還原作用而導致砷濃度降低，但整體上砷濃度分佈仍是內灣大於外灣。由於還原環境下有利於TOC的保存，表層沉積物汞濃度明顯由潮口往內灣分佈遞增。內灣測站汞的富集甚高(EF=88.46)，除了受到廢水注入的污染源影響外，TOC富集以及與硫化物結合，亦是導致內灣汞富集的原因。大鵬灣砷及汞富集程度均遠大於七股潟湖與高屏溪河口，表示大鵬灣受到人為污染程度明顯較高。
續化學萃取各相分佈顯示，砷及汞非殘餘相分佈與0.1M HCl萃取部份有極顯著正相關。沉積物砷、汞於高屏溪河口、七股潟湖及大鵬灣區域之物種分佈特徵相似，主要均存在於殘餘相部份，其次分別以鐵錳氧化相(砷)和有機質相(汞)為主要的遷移相，且沉積物砷及汞的遷移相並不受河口鹽度變化而有顯著的改變。

The purposes of this study are to evaluate and elucidate distribution patterns, speciation and pollution status of As and Hg in coastal sediments. The study focuses on coastal zones off southwestern Taiwan including the Kaoping River estuary, the Kaoping Canyon, Chiku and Tapong lagoons. Experimental results show that As and Hg in surface sediments from the Kaoping River estuary are mainly associated with mud (clay+silt) and TOC. They may also co-precipitate with Fe-Mn oxides/ hydroxides in sediments. Consequently, the seasonal variability of As and Hg distributions in estuarine sediments is likely attributed to the variations of particles size and TOC contents.
Distributions of As in surface sediments from the Kaoping Canyon are also related closely to mud, Fe-Mn oxides and TOC contents. The spatial variation of surface enrichment of As, however, is insignificant along the Kaoping Canyon. Concentrations of Hg in surface sediments are elevated around the river mouth and decrease seaward in the Kaoping Canyon. According to As and Hg distributions and accumulation rates in the Kaoping Canyon, pollution appears to increase significantly around 1970 corresponding to the period of economic boom in Taiwan.
With the exception of locations near the Chiku River and Daliao Creek, spatial distributions of As and Hg are largely determined by particle size, organic and Fe-Mn contents. In the Tapong Bay, concentrations and enrichments of As and Hg are generally higher in the inner bay than in the outer bay, primarily affected by distributions of particle size, organic and Fe-Mn contents. The enrichment of Hg in the inner bay appears to be enhanced by waste-water discharge, TOC accumulation and sulphide formation. The magnitudes of EF are larger in the Tapong Bay than in the Chiku Lagoon and the Kaoping River estuary for both As and Hg, indicating a higher pollution status in the Tapong Bay than in other areas.
Sequential extractions separate As and Hg into five fractions that can be roughly divided into mobile phase and non-mobile phase (residual fraction). The sum of mobile-like fractions is significantly correlated with the content extracted with 0.1M HCl. Arsenic and mercury speciation of sediments are quite similar in the Kaoping River estuary, the Chiku Lagoon and Tapong Bay. Both As and Hg are mostly concentrated in the residual fraction, and secondly located in Fe-Mn oxides for As, and in organic matter for Hg. Arsenic and mercury speciation in sediments are apparently not controlled by the variability of salinity in the estuary.

目 錄
致謝……………………………………………………………………Ⅰ
中文摘要………………………………………………………………Ⅱ
英文摘要………………………………………………………………Ⅲ
目錄……………………………………………………………………Ⅳ
圖目錄…………………………………………………………………Ⅴ
表目錄…………………………………………………………………Ⅵ

第一章 前言………………………………………………………..1
第二章 研究區域
2.1 高屏溪河口與高屏峽谷……………………………….9
2.2 七股潟湖……………………………………………………13
2.3 大鵬灣………………………………………………………16
第三章 材料及方法
3.1 採樣位置及方法…………………………………………….19
3.2 樣品分析方法……………………………………………….21
第四章 結果與討論
4.1 高屏溪河口及高屏峽谷……………………………………35
4.1.1 顆粒粒徑與有機碳含量分佈…………………………….35
4.1.2 表層沉積物砷與汞.………………………………………43
4.1.3 表層沉積物砷與汞之污染現況與物種特徵…………….58
4.1.4 高屏峽谷岩心…………………………………………….75
4.2 七股潟湖與大鵬灣.................................85
4.2.1 七股潟湖與大鵬灣表層沉積物顆粒粒徑和有機碳含量分
佈............................................85
4.2.2 七股潟湖與大鵬灣表層沉積物砷與汞之分佈.…………91
4.2.3 七股潟湖與大鵬灣表層沉積物砷及汞物種分離之研究.
………………………………………………………… 102
4.2.4 七股潟湖與大鵬灣表層沉積物砷與汞之污染狀況……109

第五章 結論……………………………………………………..112

參考文獻
中文部分…………………………………………………………116
英文部分……………………………………………………....118

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