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在阿尔卑斯山沿着前冰期时间序列的土壤中,多环芳的动态

Lise Marchal¹, David Gateuille¹, Emmanuel Naffrechoux¹

¹Savoie Mont-Blanc University, CNRS, EDYTEM, 73000 Chambéry, France.

The Science of the total environment

|August 3, 2023

概括

多环芳 (PAH) 在年轻土壤中迅速积累,土壤有机碳含量影响PAH的储存. 较老的土壤表现出稳定的PAH/TOC比率,这表明污染物随着时间的推移而储存的平衡.

科学领域:

环境科学环境科学
地质化学地质化学
土壤科学土壤科学

背景情况:

多环芳 (PAH) 是源于不完全燃烧的持久性有机污染物.
进冰期土壤提供了独特的环境,以研究污染物动态,因为它们的定义年龄和有限的人为影响.

研究的目的:

调查多环芳 (PAH) 污染在前冰期土壤中的演变.
了解PAH积累,土壤年龄和总有机碳 (TOC) 含量之间的关系.
评估土壤对大气污染物的长期储存能力.

主要方法:

在法国和意大利冰川的土壤时间序列中分析PAH含量,PAH储量和PAH/TOC比率.
将PAH和TOC含量演变与指数和对数模型相匹配.
对不同土壤年龄的PAH动态进行比较,从3到4200年.

主要成果:

在年龄小于150年的土壤中,PAH含量迅速增加,与TOC有很强的相关性 (r=0.83).
氧化的积累受到氧化输入和土壤存储这些污染物的能力的影响.
公元1850年以后,PAH/TOC比率下降,这表明TOC积累和PAH稀释速度更快,在170年以上的土壤中达到平衡.

结论:

土壤有机碳在预冰期环境中对PAHs的长期储存起着至关重要的作用.
土壤储存PAH的能力随着时间的推移而变化,独立于排放周期.
进冰期土壤时间序列对于了解大气污染物的长期命运非常有价值.

关键词:

冰川的前沿地区.山地土壤山地土壤这些PAHs是PAH.土壤形成的过程.土壤有机物质土壤有机物质.

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