傅立葉紅外光衰減全反射光譜在有機官能基團的分析

Applications of FTIR-ATR Spectroscopy in the Analysis of Organic Chemical Functional Groups

陳彥宇(Yen-Yu Chen) ； 張英如(Ying-Ju Chang)

《國立臺灣博物館學刊》 73卷1期 (2020/03) Pp. 1-16

https://doi.org/10.6532/JNTM.202003_73(1).01

摘要

琥珀、油與油母質為有機體歷經特定的地質條件作用，所形成之不同類型有機物，具不同的化學鍵結方式。本研究為瞭解各種有機物因鍵結差異所產生的不同吸收光譜，進而確立C-H伸縮振動模式與C＝C、C＝O伸縮模式比例關係，達到較傳統紅外光分析方法更具鑑別力且快速分析之目的。此外，為提升可信度，本研究廣泛使用不同產地的琥珀、不同國家的原油樣品及不同類型的油母質進行傅立葉紅外光衰減全反射光譜（FTIR-ATR）分析。琥珀樣品包括：緬甸、多明尼加、馬達加斯加，蘇門答臘；原油樣品包括：印尼、安哥拉、沙阿、阿聯、中國、亞塞拜然、安哥拉等地之原油樣品；油母質包括湖相、海相及陸相，分別來自：美國、臺灣、土耳其、盧森堡以及澳洲的樣品，多樣性的樣品可提升研究方法的適用性，有助於建立有機物光譜資料庫。研究結果顯示各種有機質有不同的紅外吸收光譜，利用碳氫鍵C-H伸縮振動模式與碳碳雙鍵C＝C、碳氧雙鍵C＝O伸縮模式的比值來進行積分，會得到不同有機物質在紅外光譜上明顯的差異，適用於多種有機物的鑑別。煤、原油、各種類型油母質樣品，在液體及固體的樣品都有非常良好的辨識度，其中利用伸縮震動與剪刀型震動的碳氫鍵C-H所積分的比值進行對照可以發現，不同產地有不同的吸收強度比例，在油母質也有相同的狀況，利用碳氫鍵C-H伸縮振動模式與碳碳雙鍵C＝C、碳氧雙鍵C＝O伸縮模式、C-H剪刀型震動模式，可用來分析油母質類型以及琥珀的產地來源，且具有良好解析度，實驗速度快，只需要少量樣品，分析資料快速等優勢。

關鍵字

油母質 ； 琥珀 ； 傅立葉紅外光衰減全反射光譜 ； 化學官能基

並列摘要

Organic matters, such as oil, coal, kerogen and amber, have different chemical functional groups. The complexity of chemical functional groups derives from the many sources of original contributing organic matter and long-term chemical and physical changes over geologic time. Fourier transform infrared spectrometer attenuated total reflectance (FTIR-ATR) can quantify the abundance of chemical functional groups and is a sensitive, high resolution and non-destructive analytical technique. The aim of this study was to characterize the spectral behavior and chemical structure of organic matters, in order to correlate organic matters of different types with its infrared spectra. The results show that FTIR-ATR spectra of oil contain intense aliphatic C-H stretching vibration in 2960 cm^(-1), 2925 cm^(-1), 2850 cm^(-1) region relative to the C-H (CH3) scissoring vibration at 1470 cm^(-1) and C=C aromatic ring stretching vibration at 1640 cm^(-1). We apply FTIR-ATR analyses for evaluating oil potential of kerogens. The ratio of C-H stretching (2925 cm^(-1), 2850 cm^(-1)) and C-H scissoring (1470 cm^(-1)) shows a similar ratio in the same locality of amber. In consequence, the analysis provides a rapid means of assessing organic matters and oil potential, and it can also rapidly identify the botanical origin of ambers.

並列關鍵字

Kerogen ； Amber ； FTIR-ATR ； Functional groups

參考文獻

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