山东半岛南部近海表层沉积物中脂类生物标志物的组成及形态分析

分析了山东半岛南部近海表层沉积物中游离态和碱不稳定结合态脂类物质的组成,结果显示:脂肪酸呈现以16∶0为主峰的单峰形分布趋势,具明显偶碳优势,海源为其主要来源,脂肪酸主要以结合态形式存在,不同类别的脂肪酸形态分布略有差异,脂肪酸的结构和来源是影响脂肪酸形态分布的重要因素;同样以海源为主的甾醇则主要以游离态形式存在,但陆源甾醇的结合态比重相对较高;烷烃呈现以C29烷烃为主峰的单峰形分布趋势,陆源输入是其主要来源;烷烃主要以游离态形式存在,且UCM(不可分辨成分)峰仅出现在游离态烷烃的气相色谱图中。

Composition and form distribution of lipids biomarkers in surficial sediments in southern coastal area of Shandong Peninsula

The Lipids biomarkers were used wildly to reconstruct the pale-environment,but their form distributions varied distinctly in different sediments,so in this study,free and OH——labile lipids of surfacial sediments in southern coastal area of Shandong Peninsula were investigated.The Results showed that the fatty acids were obvious in even carbon number predominance,with C16 fatty acids as the main peak and characteristic of single peak distribution,hydrocarbons were also characteristic of single peak and C29 was the main hydrocarbon.The fatty acids and sterols were mainly from autochthonous input,but the terrestrial input was the main source of hydrocarbons in the sediments.The fatty acids existed as bound forms in majority,the differences in structure and source could be the primary factors that influenced the form distributions of fatty acids,sterols and hydrocarbons mainly existed in free forms,and UCM peaks only emerged in chromatograms of free hydrocarbons fractions.