调节灌诱导的微生物-铁氧化还原作用,以释放在水田中的水-土壤界面上的和多基物质:激活还是固定?
Jianyi Wu1, Lingxuan Li1, Miao Chen1
1Key Laboratory of Poyang Lake Watershed Agricultural Resource and Ecology of Ministry of Agriculture and Rural Affairs, College of Land Resource and Environment, Jiangxi Agricultural University, Nanchang 330045, China.
The Science of the total environment
|November 6, 2024
概括
田灌显著影响了和多基物质 (PFAS) 的迁移. 洪水条件促进了PFAS在地表水中的积累,而干旱条件增加了PFAS在土壤溶液中的积累,影响了水和水的安全性.
科学领域:
- 环境化学环境化学
- 土壤科学 土壤科学
- 水的质量 水的质量
背景情况:
- 和多基物质 (PFAS) 是在田中发现的持久污染物.
- 了解水土界面的PFAS行为对于管理污染至关重要.
- 灌实践显著影响PFAS在这些环境中的命运和运输.
研究的目的:
- 调查田灌如何调节PFAS的迁移.
- 阐明在洪水和干旱条件下控制PFAS分配的机制.
- 为农业系统中的PFAS污染控制和环境保护提供见解.
主要方法:
- 在不同的灌场景下分析溶解有机物 (DOM) 转化.
- 对阴离子 (Na+,K+,Mg2+) 转位和与DOM和PFAS结合的研究.
- 评估影响PFAS分布的微生物和地化学过程 (脱,铁减氧/氧化,无氧化).
- 量化PFAS在土壤和上层水中的积累.
主要成果:
- 被洪水淹没的土壤将有机物转化为DOM,促进离子桥梁并加速C4-C9 PFAS积累在上面的水中 (41.79-99.14%).
- 干旱土壤在土壤溶液中增加了短链PFAS,受到微生物DOM (53.15-97.96%) 的刺激.
- PFAS的分布是由不同的氧化还原过程控制的:在被洪水淹没的土壤中,铁-氧化还原会固定PFAS,而在干旱的土壤中,铁氧化和无氧化会控制PFAS.
结论:
- 灌诱导的有机碳和铁动态的氧化还原转换极大地调节PFAS跨介质转移.
- 了解这些过程对于有效控制PFAS污染,保护地表水和确保大米生产安全至关重要.
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