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金属和其他元素丰富的全球模式在沼泽和泥泥地

Chetwynd Osborne¹, Spencer Gilbert-Parkes¹, Graeme Spiers²

¹Environmental and Life Sciences Graduate Program, Trent University, Peterborough, ON, K9L 0G2, Canada.

Archives of environmental contamination and toxicology

|February 10, 2024

概括

全球各地的泥炭地表现出金属的丰富性,其中的度更高. 虽然一些金属表明污染,但自然的泥炭地过程也会丰富元素,这意味着仅仅是丰富因素并不总是信号污染.

科学领域:

环境科学环境科学
地质化学地质化学
生态生态学生态生态学

背景情况:

泥炭地占地球陆地面积的3%,是重要的环境档案.
泥炭地中的金属丰富是研究不足的,特别是全球模式和人类影响.
某些金属和稀土元素 (REE) 具有人为来源,需要对泥炭地金属含量进行调查.

研究的目的:

为了评估全球的金属丰富模式在沼泽和泥泥地.
确定金属丰富的原因,区分人为来源和自然的生物地球化学过程.
评估泥炭地类型 (沼泽,) 和pH梯度在金属积累中的作用.

主要方法:

分析了来自五大洲16个国家的368个泥炭芯.
在三种深度 (高达70厘米) 测量金属和元素度.
估计累积大气硫 (S) 沉积量 (1850-2009) 和计算缩系数 (EFs).

主要成果:

中等到中等丰富的树表现出最高的金属度.
受人类源影响的金属 (As,Cd,Co,Cu,Pb,Sb) 的中位数EF>1.5.5.
对于自然丰富的元素 (Mn,K,Rb) 也观察到较高的EFS,这是由于泥炭地生物地质化学,而不仅仅是大气沉积.

结论:

泥炭土是金属沉积的重要档案,但生物地球化学过程显著影响了表面泥炭金属度.
缩因子本身不足以表明大气污染,因为自然过程也会导致金属含量升高.
了解人为投入和内在的泥炭地过程对于解释金属丰富模式至关重要.

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