东海近岸表层沉积物中正构烷烃的组成、分布及来源分析

发布时间：2018-03-06 09:00

本文选题：表层沉积物　切入点：正构烷烃　出处：《海洋环境科学》2016年03期 　论文类型：期刊论文

【摘要】：本文对东海近岸的19个表层沉积物样品中正构烷烃的分布及其组成特征进行分析。结果表明,该调查站位表层沉积物中正构烷烃均呈双峰群分布,前峰群短链烷烃无明显奇偶优势,主要来源于海洋藻类和细菌;后峰群长链烷烃具有明显的奇碳数优势,主要来源于陆生高等植物。短链和长链烷烃分布均呈现中间高两端低的分布趋势,这可能与沉积物的粒度有关,粒度越小越易吸附有机质,造成了海源和陆源都在中部出现高值。陆、海源烷烃比(ΣT/ΣM)和陆、海源烷烃优势比(TAR)对沉积有机质来源的指示是一致的,空间分布呈现近舟山群岛有高值分布,指示有较强的陆源输入。陆海比(P_(mar-aq))、平均链长(ACL)、烷烃指数(AI)、奇偶优势指数(OEP)指示研究海区主要以陆源输入为主且草本植物和木本植物的输入比例相近且没有受到石油污染。
[Abstract]:The distribution and composition characteristics of normal alkanes in 19 surface sediment samples from the East China Sea inshore are analyzed. The results show that the distribution of normal alkanes in surface sediments of this survey site is bimodal group distribution. The short chain alkanes of the front peak group have no obvious odd and even advantages, but mainly come from marine algae and bacteria, while the long chain alkanes of the back peak group have obvious odd carbon number advantage. The distribution of short chain and long chain alkanes shows a low distribution trend at both ends of the middle, which may be related to the grain size of sediments, the smaller the particle size, the easier to adsorb organic matter. The results show that both marine and continental sources have high values in the middle of the region. The spatial distribution of land, sea source / hydrocarbon ratio (危 T / 危 M) and land / sea source hydrocarbon dominance ratio (tar) is consistent in indicating the source of sedimentary organic matter, and the spatial distribution shows a high value distribution near Zhoushan archipelago. The average chain length (ACLO), alkane index (AI), and parity dominance index (OEP) indicate that the main terrestrial inputs in the study area are mainly terrestrial sources and the proportion of herbaceous and woody plants is similar and the oil pollution is not affected.
【作者单位】：青岛海洋地质研究所;中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室;
【基金】：国家自然科学基金(41406078) 中国地质调查局地址调查项目(GZH201200506)
【分类号】：P736.41;X55

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