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微塑料污染物可能会扭曲我们对海洋碳循环的理解

Luis E Medina Faull¹, Gordon T Taylor¹, Steven R Beaupré¹

¹School of Marine and Atmospheric Sciences, Stony Brook University, New York, New York, United States of America.

|October 13, 2025

概括

沉积有机物 (SOM) 中的微塑料 (MP) 污染显著扭曲了元素分析结果. 这项研究量化了MP如何导致SOM样本中不准确的碳测量,年龄估计和来源分配.

科学领域:

环境化学环境化学
地质化学地质化学
分析化学分析化学

背景情况:

元素分析 (EA) 对于表征沉积有机物 (SOM) 是至关重要的.
微塑料 (MP) 越来越多地被认为是环境污染物.
对SOM的EA的MP污染对EA的影响尚不清楚.

研究的目的:

调查和量化微塑料污染对沉积有机物元素分析的影响.
为了评估MPs对碳产量的影响,C:N比率,稳定同位素 (δ13C) 和放射性碳 (Δ14C) 测量.
确定MP污染如何影响SOM的年龄估计和来源分配.

主要方法:

用已知数量的聚乙烯 (PE) 微塑料对SOM样品的模拟污染.
在受污染和未受污染的SOM样本上进行了元素分析 (EA).
计算了MP污染对测量碳 (%C) 的影响,C:N比,δ13C,Δ14C,以及计算的放射性碳年龄.

主要成果:

在EA过程中,微塑料污染物完全氧化,导致过高估计的碳产量.
即使低水平的MP污染 (质量为1%) 也会显著改变Δ14C,δ13C和放射性碳年龄.
1%的MP污染可以导致对SOM年龄的高估约4000年,并误导陆地来源的贡献.

结论:

微塑料污染在SOM表征中引入了显著的,通常是微妙的错误.
目前的碳生物地质化学研究可能由于未被识别的MP污染导致不准确的结果.
准确评估SOM需要解决和减轻样品和分析期间的微塑料污染.

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