长江口邻近海域表层沉积物中正构烷烃的分布特征和来源分析

doi:10.13634/j.cnki.mes20160604

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摘要通过对长江口邻近海域表层沉积物中正构烷烃（n-alkanes）的含量进行调查，结果表明：沉积物中烷烃的含量范围介于17.3×10^-9~2132.3×10^-9之间，平均值821.2×10^-9。靠近长江口附近烷烃含量较低，除S5和S6站位，沿长江冲淡水自西向东方向，烷烃浓度自近岸至外海大致呈降低趋势。沉积物样品中烷烃的碳优势指数CPI_13-22和CPI_23-32分别介于0.43~0.72和1.13~2.81之间；除长江口近岸S5、S7站位，陆源有机质和海源有机质比值（TAR_HC）均显著小于1，低分子量烷烃与高分子量烷烃的比值（LMW/HMW）范围介于2.07~54.85之间，烷烃的生物标志物参数表明，沉积物中烷烃多为短链烷烃，且短链烷烃（C<25）中的偶碳烷烃占优势，主要来源于海洋自生有机体的输入。

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	刘霞
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	李慧中

关键词：长江口沉积物正构烷烃有机质来源

Abstract：The distribution of n-alkanes in surface sediments were studied in Yangtze Estuary, the concentrations of n-alkanes ranged from 17.3×10^-9 to 2132.3×10^-9,and the average concentration was 821.2×10^-9。The minimum concentration of n-alkanes was detected near Yangtze Estuary,except for station S5 and S6,the n-alkanes concentration decreased gradually following the transport of Yangtze River diluted water.The range of CPI_13-22 ranged from 0.43 to 0.72,and CPI_23-32 varied from 1.13~2.81 in sediments,TAR_HC did not exceed 1except for station S5 and S7,while the ratio of LMW/HMW ranged from 2.07 to 54.85,the n-alkanes biomarkers revealed that the short-chain n-alkanes(C<25) had significant even carbon preference,and were mainly derived from marine sources.

Key words： Yangtze Estuary sediments n-alkanes organic matter sources

收稿日期: 2015-11-16;

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基金资助:

国家重点基础研究发展计划（973计划）（2010CB428701）

作者简介:刘霞(1985-),女,山东临沂人,助理工程师,主要研究方向为环境监测与评价,E-mail:liuxia_0507@163.com

引用本文:

刘霞,褚春莹,孙立娥等. 长江口邻近海域表层沉积物中正构烷烃的分布特征和来源分析[J]. 海洋环境科学, 2016, 35(6): 822-826.

LIU Xia,CHU Chun-ying,SUN Li-e et al. Distribution and sources of n-alkanes in surface sediments from Yangtze Estuary,China[J]. Marine Environmental Science, 2016, 35(6): 822-826.

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http://hyhjkx.nmemc.org.cn/CN/10.13634/j.cnki.mes20160604 或 http://hyhjkx.nmemc.org.cn/CN/Y2016/V35/I6/822

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