在透周期期间,在不和区输送多化合物PFAS
Samuel Oluwaseun Kolade1, Avner Ronen1, Tuvia Turkeltaub1
1Department of Environmental Hydrology and Microbiology, Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 84990, Israel.
Water research
|September 18, 2025
概括
短链PFAS通过土壤迅速移动,而长链PFAS粘在沉积物上. 短暂的流量条件对PFAS的运输和保持在地下有重大影响.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 水文地质学 水文地质学
背景情况:
- 和多醇基物质 (PFAS) 是持久污染物,在地下环境中长期保留.
- 了解PFAS运输动态对于评估环境风险和制定补救策略至关重要.
研究的目的:
- 为了研究长链和短链PFAS在模拟偶发透的短暂流量条件下的同时运输.
- 评估动态水含量波动对PFAS吸附-脱附过程的影响.
- 评估基于平衡的模型在预测不和区内PFAS运输方面的局限性.
主要方法:
- 进行了大型柱体实验 (3米),模拟了不和区域流动,并进行了插曲性透周期.
- 同时跟踪长链 (PFOS,PFOA) 和短链 (PFHxA,PFPeA) PFAS的运输,以及一个保守的追踪剂 (化物).
- 利用了基于平衡的固态相和空气-水界面吸附参数 (KAWI和Kd) 的流量和运输建模.
主要成果:
- 短链PFAS (PFHxA,PFPeA) 显示出高流动性,与保守的追踪物运输密切匹配.
- 长链PFAS (PFOS,PFOA) 显示出显著的保留和延迟突破,其度波动与湿化/排水周期有关.
- 基于平衡的模型低估了长链PFAS在短暂流动下的复杂运输行为.
结论:
- 透驱动的湿化和排水周期对不和区内的PFAS分区和流动性产生了重大影响.
- 不平衡的吸附动力学必须纳入模型,以准确预测在短暂流下的PFAS运输.
- 这些发现为PFAS在受污染的地下环境中的命运,迁移和修复提供了关键的见解.
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