本研究在台灣西南海域利用海研三號2008年10月及2010年3月兩個航次，採集不同季節的海水樣品，分析水體中溶解態微量元素(鎘、銅、鎳、鋅)濃度和物種組成，藉以觀察較缺乏微量元素文獻資料的台灣西南海域中其微量元素的分布和特性，以瞭解此海域複雜的水文特性對微量元素分布的影響。
海水樣品分析中對微量元素濃度的測量，除總溶解濃度外，另使用雙管柱預濃縮方法，利用陽離子(Chelex-100)和陰離子(AG MP-1)交換管柱，將所測得的溶解微量元素分為具反應性的(Chelex-labile)物種、有機鍵結(anionic-organic)物種和穩定的(inert)物種。
研究結果顯示台灣西南海域近岸表水微量元素濃度主要受季節性不同的陸源輸入影響，而最顯著的來源為高屏溪、二仁溪和曾文溪三條河川，高屏溪豐水期(5月~10月)和枯水期(11月~4月)水量相差很大，使得兩個航次在高屏溪口所觀測到的微量元素濃度不同。部分近岸垂直剖面結果則顯示，微量元素分布呈現不規律的跳動情形，可歸因於台灣西南海域近岸的水文條件：近岸及峽谷內海水受潮汐影響和非潮汐主導的海流使此海域流況較複雜，此外高屏峽谷內有時可觀測到的內波都會對此海域造成影響。大陸坡測站水中，總溶解鎘、鎳和鋅與營養鹽呈現良好的相關性，與其他海域比較，本研究中大陸坡測站微量元素垂直分布與太平洋、印度洋的分布較不同，而與鄰近邊緣海的分布相似。
微量元素物種組成方面，本研究中四種微量元素都是以Chelex-labile所占的比例最高，少部分以inert的形式存在，溶解態銅和鎘在近岸測站inert比例較高，顯示部分由陸源輸入的溶解態銅和鎘為穩定且較不具反應性的，而本研究的四種微量元素中，只有溶解態銅可觀測到有一定比例的anionic-organic，這是因為銅和有機官能基間具有強的親和力的關係。

Water samples were collected from coastal region off southwestern Taiwan during two cruises in different seasons (October, 2008 and March, 2010). In order to provide information for trace elements in this region, this study investigated the distribution and partitioning of dissolved trace elements (Cd, Cu, Ni, Zn), and to relate the influences of complicated hydrological conditions to trace element distributions.
Fractionation of dissolved trace elements was applied by a one-step preconcentration technique which uses cationic and anionic exchange columns. Trace element fractions were separated to operationally defined reactive (Chelex-labile), organically complexed (anionic-organic), and stable (inert) species.
Distributions of trace elements from near-shore surface waters off southwestern Taiwan were mainly affected by temporally variable terrigenous inputs and hydrological conditions. The most significant sources of trace elements were from the Gao-Ping, Er-Ren, and Tseng-Wen Rivers. Some near-shore vertical profiles of trace elements and nutrients showed abnormal distributions that could be attributed to complicated currents in this region. Trace elements in waters at offshore stations in this study showed nutrient-type distributions, and that is similar to other open ocean vertical profiles, except for the upper layers, where terrestrial influences were pronounced in this study.
The major proportions of trace elements determined in this study were of the Chelex-labile fractions, indicating that they were reactive and bioavailable. There is a small part of inert fraction, and the proportions are different between inshore and offshore waters, with pronounced inert fractions in near-shore waters.

致謝 i
中文摘要 ii
英文摘要 iv
目錄 vi
圖目錄 viii
表目錄 xi

第一章 緒論
1.1 前言 1
1.2 研究區域 3
1.3 研究目的 5
第二章 材料與方法
2.1 採樣方法 8
2.2 實驗與分析方法 10
第三章 結果與討論
3.1 表水微量元素水平分布 19
3.2 近岸海水垂直剖面分布 23
3.3 大陸坡測站微量元素分布與特性 26
3.4 微量元素物種組成分布和特性 32
第四章 結論 64
參考文獻
中文部分 66
英文部分 67
附錄 71

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