溫良碩Wen, Liang-Saw臺灣大學:海洋研究所馮英哲Fong, Ying-CheYing-CheFong2010-05-062018-06-282010-05-062018-06-282008U0001-2207200817150600http://ntur.lib.ntu.edu.tw//handle/246246/181199　　本研究透過物理分離（孔徑大小為0.1 μm、0.45 μm之正壓過濾法及分子量1000之交流過濾法）與化學分離（陰陽離子交換法），探討淡水河全流域河水及河口水中，溶解相鐵及其物種之大小分布與化學親和性。研究顯示，三條主支流中，基隆河之溶解相鐵（≦0.45 μm）濃度最高（579±85 nM），新店溪（116±27 nM）與淡水河（95±28 nM）次之，大漢溪最低（75±28 nM）。以分子量大小判斷，鐵及其化合物主要以膠體相（≧1 kDa）存在（~94%），其中部分為0.1~0.45 μm之微顆粒態或高分子化合物，真溶解相（≦1 kDa）於淡水河流域僅佔極小比例(~6%)。由化學親和性分析，基隆河之鐵化合物以FeCation-exchanged（~52%）最多，新店溪、大漢溪與淡水河則以FeInert（鐵錯合物）為主要物種（55~73%）；此外，FeZwitterionic於全流域皆存在，但比例較低（~9%）。研究結果顯示，淡水河流域中鐵之相變化頻繁、反應劇烈、濃度分布差異大，且大部分為非守恆型移除型態。膠體鐵本身具有不同之化學特性，可能為各種化學型態相異之鐵物種所組成，且各物種間存在著比例關係。Using physical (0.1 and 0.45 μm cut-off filters) and ion exchange (Chelex-100 and AG MP-1 resins) separation techniques, detailed distribution patterns and chemical affinities of Fe were investigated under different redox conditions in the watershed of the Danshuei River, a macro-tidal, temporally anoxic estuary, passing though the metropolitan area of Taipei. Concentrations of dissolved Fe in the Danshuei River tributary/estuary ranged from 9 to 1543 nM, with the majority residing in the 1 kDa~0.1 μm fraction (~50%), in which the largest fraction occurred as cation-exchanged species (~47%). Concentrations of truly dissolved Fe (≦1kDa) showed almost at constant fraction (~6%) in the whole watershed, except in the estuary where it was lower (~15%). Furthermore, the results indicated that ~9% dissolved Fe showed zwitterionic behavior. Concentrations of dissolved iron in the upstream Keelung River were significantly higher than in the other rivers. Results obtained in this study clearly demonstrate that under different flow and redox conditions in estuarine waters, iron remaining in the water column during the removal process had a distinct pattern of size distribution and chemical affinity. Geochemical factors, including salinity, pH, dissolved oxygen and suspended particulate matter concentrations, control concentrations and distributions of the different fractions for the physical and chemical speciation scheme.中文摘要…………………………………………………………………I文摘要…………………………………………………………………II錄……………………………………………………………………III目錄……………………………………………………………………V目錄…………………………………………………………………VI一章　緒論……………………………………………………………11.1　鐵元素之地球化學特性…………………………………………11.2　研究區域…………………………………………………………2　1.2.1　流域範圍……………………………………………………2　1.2.2　雨量及流量…………………………………………………3　1.2.3　研究文獻與統計資料………………………………………41.3　研究目的…………………………………………………………5二章　材料與方法……………………………………………………62.1　採樣時間及地點…………………………………………………62.2　實驗原理…………………………………………………………6　2.2.1　物理分離……………………………………………………7　2.2.2　化學分離……………………………………………………72.3　實驗步驟…………………………………………………………8　2.3.1　器材準備……………………………………………………8　2.3.2　樣水前處理…………………………………………………9　2.3.3　樹脂活化……………………………………………………9　2.3.4　樣水預濃縮………………………………………………10　2.3.5　微量元素沖提……………………………………………11　2.3.6　濃度檢測…………………………………………………112.4　水文化學分析方法……………………………………………11三章　結果……………………………………………………………183.1　基本水文概述…………………………………………………183.2　溶解相鐵之空間分布與物種變化……………………………20　3.2.1　溶解相鐵濃度於淡水河全流域之空間分布……………20　3.2.2　分子量大小不同的溶解相鐵之物種變化………………21　3.2.3　化學親和性不同的溶解相鐵之物種變化………………22四章　討論……………………………………………………………414.1　溶解相鐵物種之區域性變化…………………………………414.2　物種變化與pH值………………………………………………424.3　物種變化與SPM…………………………………………………424.4　物種變化與氧化還原作用……………………………………434.5　鐵之反應性……………………………………………………43五章　結論……………………………………………………………52考文獻…………………………………………………………………53application/pdf2411108 bytesapplication/pdfen-US鐵物種變化淡水河Chelex-100樹脂AG MP-1樹脂ironspeciationDanshuei Riverion exchangeChelex-100AG MP-1thesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/181199/1/ntu-97-R95241404-1.pdf