【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
【机 构】
:
青岛市环境保护局高新区分局,青岛市环境监测中心站,中国海洋大学化学化工学院,
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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CPI13-22和CPI23-32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(TARHC)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。
The investigation of n-alkanes in the surface sediments of the Yangtze River Estuary shows that the content of alkanes in the sediments ranges from 17.3 × 10-9 to 2132.3 × 10-9. The average 821.2 × 10-9. Alkanes near the Changjiang Estuary are relatively low, with the exception of stations S5 and S6, along the Yangtze River flushing water from west to east, the alkane concentration generally decreases from near shore to offshore. In the sediment samples, the carbon dominance index (CPI13-22) and CPI23-32 (alkane) were between 0.43 ~ 0.72 and 1.13 ~ 2.81, respectively. Except for S5 and S7 stations near the Yangtze River Estuary, the TARHC (LMW / HMW) ranged from 2.07 to 54.85. The biomarker parameters of alkanes showed that most of the alkanes in the sediments were short-chain alkanes, and short-chain alkanes ( C <25), predominantly derived from the input of marine autotrophic organisms.
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