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从受污染的农业土壤中的前体中生产 perfluoroalkyl 酸 (PFAA):批量和浸出实验

Klaus Röhler¹, Bernd Susset¹, Peter Grathwohl¹

¹Department of Geosciences, University of Tübingen, Schnarrenbergstraße 94-96, 72076 Tübingen, Germany.

The Science of the total environment

|August 26, 2023

概括

农业土壤中的和多基物质 (PFAS) 可以污染地下水. 这项研究表明,PFAS前体几十年来一直不断释放 perfluoroalkyl 酸 (PFAA),需要长期的现场管理策略.

科学领域:

环境化学环境化学
土壤科学土壤科学
污染物水文学污染物水文学

背景情况:

和多基基物质 (PFAS) 污染土壤,对地下水构成风险. 持久性 perfluoroalkyl 酸 (PFAA) 和它们的前体经常在受污染的地点共存.
了解PFAS释放和转化对于有效的现场管理和整治策略至关重要.

研究的目的:

调查PFAS污染的农业土壤中PFAA的释放情况.
为了量化PFAS前体的转化为PFAA随着时间的推移.
估计受污染的土壤中PFAA的长期排放潜力.

主要方法:

和柱测试被用来评估从受污染的土壤样本中漏的PFAA.
进行了批量测试,以监测60天内从前体中产生PFAA的产量.
直接总可氧化前体 (dTOP) 试验被用来估计前体储量.

主要成果:

观察到短链 (C4-C8) perfluoroalkyl carboxylic 酸 (PFCAs) 的快速浸出,较长链 (≥ C9) 的浸出速度较慢.
土壤的化表明从前体中持续产生PFAA,显著增加水性度.
dTOP测试显示了大量的前体储备,PFCA度在测试后增加了高达两倍的数量.

结论:

由于前体转化,被PFAS污染的农业土壤可以作为PFAA的长期来源.
估计的排放时间表表明,C4-C8 PFCAs的释放将持续数十年.
有效的场地管理需要考虑PFAS的持久性和前体化合物的持续释放.

关键词:

农业土壤农业土壤批量测试批量测试柱子漏试验柱子漏试验这是PFAAA.在PFAS中,有很多方法.前体转换的前体转换在dTOP测试中进行dTOP测试.

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