Composition and form distribution of lipids biomarkers in a sediment core from southern coastal area of Zhejiang Province

WANG Jiang-tao; YANG Shu; TAN Li-ju; HU Ji

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WANG Jiang-tao, YANG Shu, TAN Li-ju, HU Ji. Composition and form distribution of lipids biomarkers in a sediment core from southern coastal area of Zhejiang Province[J]. Haiyang Xuebao, 2011, 33(5): 83-90.

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WANG Jiang-tao, YANG Shu, TAN Li-ju, HU Ji. Composition and form distribution of lipids biomarkers in a sediment core from southern coastal area of Zhejiang Province[J]. Haiyang Xuebao, 2011, 33(5): 83-90.

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Composition and form distribution of lipids biomarkers in a sediment core from southern coastal area of Zhejiang Province

College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

Received Date: 2010-09-03

Abstract

Abstract

Previous studies show that: the composition and form distribution of lipids vary distinctly in different sediments, so to study the composition and form distribution of lipids biomarkers in southern coastal area of Zhejiang Province (the mud areas of the East China Sea shelf), a sediment core is collected, free and OH^--labile lipids of the core are released via sequential treatments. Results show that fatty acids are in obvious even carbon number predominance, and characteristic of single peak with C16-fatty acids as the main peak, the vertical content distribution of fatty acids is mainly controlled by degradation, bound form is the main existent form of fatty acids in the core except in surficial sediment, where fatty acids mainly exist in free forms. A&K (fractions of alcohols and ketones) which are constituted mainly by sterols and fatty alcohols exist as free forms in majority, but phytols perform distinctly which mainly exist in bound forms, degradation mightily affects their vertical content distributions, but for ketones, eutrophication of the upper water in the East China Sea probably also play an important role, and in sediments of about 1950-1969, the contents of many lipids vary abnormally, we consider that this may illuminate the possible change of the ecosystem of upper water in the East China Sea caused by Changjiang River floods in 1954 and 1969. Hydrocarbons are characteristic of double peaks, and the concentration of C29,C31 are higher than other hydrocarbons, hydrocarbons are mainly exist in free forms, and UCM (Unresolved Complex Mixtures) peaks only emerge in chromatograms of free hydrocarbons fractions. Fatty acids and A&K in each form are mainly from marine sources while terrestrial input is the main source of hydrocarbons.
- the mud areas of the East China Sea shelf,
- sediments,
- lipids biomarkers,
- form distribution

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