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燃烧性PAHs在印度洋东部具有不同的生态化学命运

Mengyang Liu^1,2,3, Haowen Zheng¹, Hongliang Li⁴

¹State Key Laboratory of Marine Environmental Science and College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China.

Environmental science & technology

|December 3, 2024

概括

来自木材燃烧的多环芳 (PAH) 在深海中耗尽,而来自煤炭燃烧的聚环芳 (PAH) 在海洋中积累. 这揭示了影响海洋碳循环的独特生物地化学命运.

科学领域:

海洋地球化学海洋地球化学
有机地化学有机地化学
环境科学环境科学

背景情况:

了解多环芳 (PAHs) 在深海的命运对于海洋生物地球化学碳循环至关重要.
人类活动将PAHs引入海洋环境,需要研究它们的环境行为.

研究的目的:

分析印度洋东部深海沉积物中半挥发性有机化合物 (SVOC) 的分布和来源.
阐明来自不同燃烧源 (木材与煤炭) 的PAHs独特的生物地化学命运.

主要方法:

在印度洋东部深处 (2161-4545米水深) 采集地表沉积物样本.
对29种SVOC的分析,包括母PAH和基化衍生物,以及源生物标志物.
总SVOCs (29SVOCs: 23.0-183 ng/g) 和PAHs (16PAHs: 11.3-93.3 ng/g) 的量化.

主要成果:

研究区域的PAH主要来自燃烧源,如燃煤,交通排放和木材燃烧.
来自木材燃烧的PAH显示出一个耗尽主导的命运,可能是由于生物降解和光降解.
来自煤炭燃烧的PAHs表现出由积累主导的命运,这归因于它们的持久性和疏水性,导致沉积.

结论:

来自生物质 (木材) 和化石燃料 (煤炭) 燃烧的PAH在深海中经历不同的生物地球化学过程.
这些不同的命运影响了人为压力下的耐火有机碳的海洋循环.
该研究强调了来源分配对于了解海洋生态系统中PAH行为的重要性.

关键词:

孟加拉湾的孟加拉湾.机器学习是机器学习.海洋沉积物的海洋沉积物.多环芳香化合物 (PAC) 是一种多环芳香化合物.稳定的同位素是稳定的.

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