同时存在的Cd (II) 和As (V) 对阳离子PFAS在土壤中的吸附的影响:模型和机制
Wei Zhang1, Jianwei Li1, Ruihua Huang1
1State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, 210023, China.
Environmental pollution (Barking, Essex : 1987)
|February 25, 2025
概括
这项研究揭示了重金属如何影响土壤对和多醇基物质 (PFAS) 的吸收. 模型准确地预测PFAS吸附,这对于管理共污染场所至关重要.
科学领域:
- 环境化学环境化学
- 土壤科学 土壤科学
- 环境风险评估环境风险评估
背景情况:
- 和多基物质 (PFAS) 和重金属 (HM) 是常见的土壤共污染物.
- 了解PFAS在土壤中的吸收对于评估环境风险至关重要.
研究的目的:
- 研究 perfluorooctanoic 酸 (PFOA), perfluorooctanesulfonic 酸 (PFOS) 和 perfluorohexanesulfonic 酸 (PFHxS) 在土壤中的吸附行为.
- 开发模型,预测PFAS吸附受土壤特性影响,并共同污染HMs.
主要方法:
- 开发了一种多重线性回归 (MLR) 模型,根据土壤特性 (有机碳,污泥,粘土,Fe/Al-氧化物) 预测PFOS吸附.
- 研究了 (Cd2+) 和 (As5+) 在六种不同土壤中对PFAS吸附的影响.
- 构建了一个新的非线性模型来量化HM对PFAS吸附的影响.
主要成果:
- 该MLR模型有效地预测了高精度的PFOS分布系数 (Kd) (r2 = 0.942).
- 通过改变土壤-PFAS相互作用,Cd2+增加了PFOS吸附,而As5+减少了它.
- 与PFOS相比,HM对PFOA和PFHxS吸附的影响很小.
结论:
- 在共污染的土壤中,可以使用土壤特性和HM存在来开发准确的PFAS吸附模型.
- 了解HM-PFAS相互作用对于有效的污染场所整治策略至关重要.
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