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沿海海洋沉积物中的微量金属:自然和人为来源,相关矩阵和代理潜力

K Mareike Paul¹, Niels A G M van Helmond², Caroline P Slomp²

¹Environmental Geochemistry Group, Department of Geography and Geosciences, Faculty of Science, University of Helsinki, Helsinki, P.O 64 (Gustaf Hällströmin katu 2), FI-00014, Finland.

The Science of the total environment

|August 28, 2024

概括

工业化增加了沿海微量金属污染. 超矩阵分析显示 (Pb) 是可靠的污染指标,但靠近岸边影响信号解释,以获得准确的环境记录.

科学领域:

环境科学环境科学
地质化学地质化学
海洋地质海洋地质学

背景情况:

自19世纪以来,工业化显著增加了沿海沉积物中的微量金属沉积量.
如果金属保持不移动,沉积物微量金属丰富可以作为历史污染记录.
对微金属流动性和保存的控制 (地球化学,氧化还原,有机物质,浴度) 是复杂的,并未完全理解.

研究的目的:

开发一种新的元矩阵方法,快速识别不同沿海地区的共同和对比的微量金属缩模式.
通过更好地了解其控制因素,提高基于微量金属的环境代理的可靠性.
识别强大的微量金属指标,用于重建污染历史.

主要方法:

编制和分析了来自短沉积物核心的16种微量金属 (化物),总有机碳和硫的9个特定地点的相关性矩阵.
创建了一个单一的元矩阵来合成和比较不同研究地点的微量金属相关性模式.
评估了人为和环境因素 (例如,氧化还原变性) 对微量金属共变的影响.

主要成果:

确定了两个主要的微量金属组:第一组 (Pb,Cd,Zn,Cu,Sb) 主要受到人为来源的影响,第二组 (Mo,U,Re) 对氧化还原条件敏感.
观察到一些I组和II组金属之间的共变性,表明氧化还原变性可以掩盖人为信号.
确定 (Pb) 是一个强大的污染指标,离岸的距离对于区分大气和当地河流污染信号至关重要.

结论:

将特定地点的沉积物数据与元矩阵方法相结合,可以提高对沿海环境中微量金属捕获的理解.
认识到金属地化学,沉积环境和接近污染源之间的相互作用提高了微金属代理的可靠性.
(Pb) 是历史污染的可靠指标,但它的解释需要考虑地方和区域污染源.

关键词:

脱氧化是一种脱氧化.金属污染污染金属污染靠近海岸的沉积环境.在R corrplot中使用了corplot.对于氧化回收敏感的物质微量元素的共同变化

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