防城港海域沉积物中正构烷烃分布和来源解析

doi:10.11720/wtyht.2024.1088

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Abstract

n-alkanes, exhibiting stable chemical properties, are ubiquitous in nature. They are favorable indicators of the source of organic matter. Using the gas chromatography-mass spectrometry (GC/MS), this study detected n-alkanes in the surface sediments sampled from the Fangchenggang sea area in September 2021. It analyzed their content and distribution, as well as their source based on characteristic parameters. The results are as follows: ① The n-alkanes of the Fangchenggang sea area manifested a content range of (67.51~850.08)×10^-9 (dw), averaging 476.69×10^-9 (dw), with high values primarily distributed in the southern sea area of Qisha Peninsula; ② They were principally composed of extensive n-C₁₄~n-C₃₅ n-alkane homologues in a bimodal distribution. The former peak group displayed an even-carbon number advantage, while the latter showed an odd-carbon number advantage; ③ The terrestrial-marine alkane ratio (ΣT/ΣM), carbon predominance index (CPI), and terrestrial-marine alkane predominance ratio (TAR) all indicate a significant terrestrial influence on n-alkanes in the Fangchenggang sea area; ④ The average chain length (ACL), alkane index (AI), and Pmar-aq further suggest that n-alkanes were mainly from terrestrial herbs; ⑤ The T-ALK/C₁₆ ratio implies that the Fangchenggang sea area experienced oil pollution; ⑥ The pristane/phytane ratio (Pr/Ph) reveals that n-alkanes in the sediments of the Fangchenggang sea area formed in an oxidizing environment.

Key words： sediment n-alkane characteristic ratio source

Received: 28 February 2023 Published: 16 April 2024

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	Guo-Tao PANG
	Yuan-Zhen YANG
	Lei XIE
	Wei LI
	Xiao-Lei ZHANG
	Xing-Guo YAN

Cite this article:

Guo-Tao PANG,Yuan-Zhen YANG,Lei XIE, et al. Distribution and sources of n-alkanes in sediments in the Fangchenggang sea area[J]. Geophysical and Geochemical Exploration, 2024, 48(2): 527-533.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1088 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I2/527

Sampling location of Fangchenggang sea area

Detection limit of n-alkanes

Distribution of n-alkanes in sediments of the study area

Histogram of n-alkane content with different chain length at typical stations

Spatial distribution of marine and terrestrial n-alkanes ∑C_15-21 and ∑C_25-35 contents in surface sediments

Comparison of n-alkane concentrations in surface sediments of offshore waters

The geochemical proxies of n-alkanes alkanes in surface sediments of study areas

Spatial distribution of surface sediment ΣT/ΣM and TAR

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