臺灣博碩士論文加值系統

本研究根據Parham和Mobarakzadeh（2002）應用冠狀醚DC18C6(dicyclohexyl-18-crown-6) and dichloromethane測定水中Ba2+的方法，改進以液相－液相萃取分離海水alkali metals and alkaline metals基質干擾和原子吸收光譜儀測定河口水中溶解性Ba2+的濃度，做為未來研究海洋沿岸海底地下水湧出的應用。冠狀醚DC18C6與Ba2+錯合成冠狀醚配位化合物（DC18C6 Ba2+ L）形成穩定常數值（Kf）是IA、ⅡA金屬中最大，利用DC18C6與Ba2+錯合特性來分離基質干擾並測定水中溶解性Ba2+的濃度；在SRM 1643d標準水樣中Ba2+含量為506.5±8.9 ppb，測得平均Ba2+濃度為76.2ppb±44％，平均回收率為15％，淡水河漲潮河口水（鹽度為31‰，平均Ba2+濃度為36ppb±47％）及退潮河口水（鹽度為26‰，平均Ba2+濃度為20ppb±81％），其萃取回收效果不佳，可能DC18C6與Ba2+錯合能力太強以至在加強酸反萃取時無法完全破壞錯合物。

Dissolved barium is a geochemical indicator of submarine groundwater in coastal research.
Crown ether has very high selectivity for alkali metals (IA) and alkaline earth metals (IIA) to form stable DC18C6M+ and DC18C6M2+ complex ions. Stability constant of formation for coordination compounds (DC18C6M2+L) is the highest for Ba2+ then for other IA and IIA metals. Based on characterizations of crown ether and DC18C6Ba2+L, Ba2+ is separated from interference of the large amounts of IA and IIA metals in sea water. Dissolved Ba2+ in coastal waters may be determined by atomic absorption spectrophotometry after liquid-liquid extraction with DC18C6. The optimal conditions of measurement are investigated in this study.
The dissolved Ba2+ in artificial water (SRM 1643D) is 76.2ppb±44％ (certified value 506±8.9ppb) by determination of this method. The average recovery of measurement is only 15％. The barium concentration of Danshui estuarine water at a salinity 31‰ is 36ppb±47％ during spring tide, and 20ppb±81％ at a salinity 26‰ during ebb tide.

第一章 緒論
1-1 歷史回顧....…….….………………..……………….. 1
1-2 研究動機..………....………………….….………….12
第二章 分離濃縮技術與原子吸收光譜儀
2-1 測定海水重金屬.....…………..………….………….13
2-2 分離技術..………..………………….………………..16
2-3 原子吸收光譜儀發展與簡介...…..…….……………19
2-4 偏極化芮曼效應校正系統.......……………………...21
2-5 原子吸收光譜儀的基質干擾與消除……………….22
2-6 石墨爐原子吸收光譜儀之探討及使用溫度.....……26
第三章 實驗器材及步驟
3-1 實驗器材……………………..……….……………….28
3-2 實驗藥品………………..……....………..…….…….28
3-3 實驗步驟…………………………………………….30
3-4 DC18C6 / dichloromethane 溶劑萃取系統測定水中
Ba2+離子實驗步驟………………………………..…34
3-5 DC18C6 / dichloromethane 溶劑萃取系統測定1643d
中Ba2+離子實驗步驟………………………..………36
第四章 結果
4-1 Ba2+－DC18C6螯合萃取反應平衡..……………..…37
4-2 pH值對萃取系統之影響…………………….………39
4-3 有機層－水層分配平衡…………………….…...…40
4-4 螯合劑濃度的影響……………………………..……42
4-5 反萃取作用動力平衡………………………………43
4-6 反萃取作用強酸的影響…………………………….44
4-7 反萃取作用有機層－水層分配平衡……………….45
4-8 有機溶劑體積的影響……………………………….47
4-9 DC18C6 / dichloromethane 溶劑萃取系統測定水中
Ba2+離子……………………………………………..48
4-10 DC18C6 / dichloromethane 溶劑萃取系統測定1643d
中Ba2+離子…………………………………………..50
第五章 討論
5-1 DC18C6 / dichloromethane溶劑萃取系統
改進方法…………………………………………..52
第六章 結論………………………………………………………56
參考文獻……………………………………………………………57

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