臺灣博碩士論文加值系統

本研究主要分析台灣宜蘭縣三星鄉的大湖湖泊底泥中脂肪族碳氫化合物(Aliphatic Hydrocarbons Compositions, AHCs) C14至C35直鏈烷濃度分佈狀況，以生物指標(Biomarker molecule proxies)評估底泥中有機物來源及貢獻量。岩芯深度130.5公分，年代分佈現今到600年前，分析樣品數合計115個。總直鏈烷C14~C35濃度平均為16.1±8.0 μg/g。長碳鏈(C26~C32) 直鏈烷濃度平均為9.1±5.2 μg/g，長碳鏈碳優指數CPIL平均3.8±1.01，顯示長碳鏈奇數碳皆可能源自陸源高等植物。Paq值平均0.25±0.06，顯示600期間大湖皆有水生植物; C31/ (C27+C29)比值平均0.62±0.13，顯示生長於集水區陸生植物可能以木本植物為主，變量不大。短碳鏈直鏈烷(C14~C20) 濃度平均為2.50±1.3 μg/g，短碳鏈直鏈烷佔總直鏈烷濃度19.2%±12.2 %。短碳鏈碳優指數CPIS平均0.74±0.3，顯示大部分樣品具有短碳鏈偶數碳優勢，可能與底泥中為厭氧微生物環境有關。表層兩個樣品(0.25公分, 1.25公分)CPIS分別為1.94及1.55，以奇數碳C17為優勢，可能源自水生浮游藻類沉積。另外，深度7.5 cm~12 cm連續十個樣品 CPIS平均0.12± 0.02遠低於平均值，涵蓋約19年，主要以C14、C16為主，此偶數碳優勢來源是否與底泥微生物環境或源自陸源高等植物將再進一步做探討。

One hundred - fifteen samples from the sediment core were analyzed for aliphatic hydrocarbons (AHCs), C14-C35 n-alkanes, of Dahu Lake, Yilan, Taiwan. The sediment samples were Soxhlet extracted and GC-FID analyzed. The total n-alkanes (C14-C35) concentrations averaged 16.1± 8.0 μg/g. The average concentrations of long chain n-alkanes (C26-C32) and short chain n-alkanes (C14-C20) were 9.11± 5.17 μg/g and 2.50±1.33 μg/g, respectively. The CPI L of 3.79±1.01 indicated biogenetics feature of the major terrestrial plant sources. The CPIS of 0.74± 0.33 (0.10~1.94) also indicated biogenetics feature, including sediment microorganism sources and suspended algae sources. In addition, CPIS values of 10 consecutive samples from 7.5cm to 12cm in depth were 0.12±0.22, resulted from the predominance of C14, C16 and C18. This occurrence of short chain n-alkanes with an even over odd predominance are suggested the source from terrestrial higher plants and need then further to be explored.

目錄
誌謝 i
中文摘要 ii
英文摘要 iii
目錄 iv
圖目錄 vi
第一章 緒論 1
1.1 前言 1
1.2直鏈烷來源及其生物特性 1
1.3碳優指數(Carbon preference index, CPI) 3
1.3.1 短碳鏈碳優指數CPIS 3
1.3.2 中碳鏈碳優指數CPIM 4
1.3.3 長碳鏈碳優指數CPIL 4
1.4環境指數 5
1.4.1 Paq指數(The aquatic plant n-alkane proxy) 5
1.4.2 TAR指數(The ratio of terrigenous to aquatic n-alkanes) 5
1.4.3 C31/(C27+C29)比值 6
1.5研究目的 6
第二章 材料與方法 7
2.1 研究地點 7
2.2 樣品採集. 7
2.3 樣品分析率 7
2.4 大湖底泥定年結果 8
2.5藥品及儀器 8
2.5.1藥品 8
2.5.2 儀器 8
2.6 樣品前處理 9
2.6.1 器材前處理 9
2.6.2 索氏萃取 9
2.6.3 前濃縮 10
2.6.4 萃取液除硫 10
2.6.5 管柱層析 (Column Chromatography) 10
2.7 儀器分析 11
2.7.1分析物質 11
2.7.2 氣相層析儀及火焰離子偵測器 (GC/FID) 11
2.7.3 氣相層析儀參數設定及升溫程式 11
2.7.4 定性及定量分析方法 12
第三章 結果 15
3.1 儀器分析結果 15
3.1.1 標準品分析結果 15
3.1.2 實驗室品管分析樣品結果 15
3.2 樣品直鏈烷濃度 16
3.2.1 總濃度深度分佈 17
3.2.2長碳鏈和短碳鏈之濃度及其濃度深度變化 17
3.3 長碳鏈中直鏈烷各優勢種 18
3.4 短碳鏈中直鏈烷各優勢種 18
3.5 環境指數 19
3.5.1 碳優指數(Carbon Preference Index, CPI) 19
3.5.3 Paq指數(The aquatic plant n-alkane proxy) 20
3.5.4 C31/(C27+C29) 20
第四章 討論 21
4.1 直鏈烷來源 21
4.1.1 陸生植物提供長碳鏈 21
4.1.2 短碳鏈來源 21
4.2 環境指數之應用 22
4.2.1 陸域植被環境 22
4.2.2 水生及底泥環境 22
第五章 結論 24
參考文獻 25

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