Identification and Significance of Long Chain Fatty Acid Ethyl Ester in Quaternary Sediments from Chaidamu Basin
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摘要: 本文利用GC—MS分析研究了柴达木盆地涩深1井四个第四系岩芯中芳烃镏分,从中检出了一系列长链脂肪酸乙酯化合物。它们的质谱物征是:基峰为m/z88,具有较强的m/z101、157特征碎片离子和M+、M+-43离子峰。它们的碳数分布范围为C15—C34,主要分布在高碳数区,主峰碳数为C28,具有明显的偶碳数优势;并对其地球化学意义进行了探讨。Abstract: The aromatic hydrocarbon fraction of 4 Quaternary cores from Chaidamu Basin was analysed by GC一MS. As a result,a series of long chain fatty acid ethyl esters(C15一C34 ) were first found.Their mass spectrum characteristics are that base peak is m/z 88 and characteristic ion is m/z 101、157,M+,M+一43. These ion existence were confirmed by fragmenting analyses of fatty acid ethyl esters. Distribution of the carbon number of fatty acid ethyl esters in studied samples is from C15 to C34 maximizing at C28 with a strong even to odd carbon number preference. we believe occurrence of fatty acid ethyl esters in studied samples may be related to biochemical process. Fatty acid ethyl esters of Quaternary sediments in Chaidamu Basin may play an important part in formation of biogas in this region.
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