太湖沉积物中长链脂肪酸甲酯化合物的检出及意义  被引量:8

Identification and Significance of Long Chain Fatty Acid Methyl Ester in the Surface Sediment of Taihu Lake

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作  者:瞿文川[1] 王苏民[1] 吴瑞金[1] 张平中[2] 陈践发[2] 

机构地区:[1]中国科学院南京地理与湖泊研究所,南京210008 [2]中国科学院兰州地质研究所,兰州730000

出  处:《湖泊科学》1999年第3期245-250,共6页Journal of Lake Sciences

基  金:中国科学院湖沼专项资助项目

摘  要:在太湖表层沉积物中检测出丰度较高的一系列长链脂肪酸甲酯化合物,采用标准图谱与质谱解析相结合的方法进行鉴定.长链脂肪酸甲酯化合物有类似正构烷烃的分布型式,碳数分布范围为C_(14)-C_(34),主峰碳为C_(16),具有明显的偶碳优势对太湖沉积物中长链脂肪酸甲酯化合物的来源、存在的地球化学环境等进行了讨论。The aromatic hydrocarbon fraction of the surface sediment in the west and east part of Taihu Lake was analyzed by GC-MS. As a result, a series of long chain fatty acid methyl esters was first found. Distribution of the carbon number of fatty acid methyl esters in the samples was from C_14 to C-34 maximizing at C_16 with a strong even to odd carbon preference. Their mass spectrum char- acteristics are that base peaks were M/Z 74, 87 and characteristic ions were M/Z 143, 199, M^+, M-43^+. These ion existence was confirmed by fragmenting analyses of fatty acid methy esters. The origin of the long chain fatty acid methy esters in the sediment of Taihu Lake was also stud- ied, which may be related to biochemical process. The result showed that the long chain fatty acid methyl esters was probably an important biological marker to study the acidity of the lake sediment.

关 键 词:太湖 沉积物 脂肪酸甲酯 酸碱度 化合物 

分 类 号:P512.3[天文地球—地质学]

 

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