在不和区中Pb和Cd的迁移和转化是由表水位波动引起的
Nan Liu1, Xiaotong Wang2, Meng Chen3
1College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China.
Journal of hazardous materials
|April 10, 2025
概括
地下水位的波动对不和土壤中的重金属 (Pb和Cd) 迁移有重大影响. 这些金属积聚在上层土壤层中,由于与Pb的相互作用,Cd可能变得更具流动性.
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:
- 土壤和地下水中的重金属迁移是一个关键的环境问题.
- 波动的地下水表使预测重金属的运输和转化变得复杂.
- 在这种条件下, (Pb) 和 (Cd) 在不和区的行为存在有限的研究.
研究的目的:
- 研究Pb和Cd在不和土壤中的迁移,转化和相互作用.
- 了解地下水位波动对重金属行为的影响.
主要方法:
- 进行了柱体实验,以模拟波动的水表条件.
- 分析Pb和Cd在不和区的迁移和转变.
主要成果:
- Pb和Cd向上迁移到水位上升的沙层中,特别是在低pH下.
- 反复的波动导致了Pb和Cd在上层土壤层中的积累.
- 较低层的Cd含量下降,可能是由于受Pb共存影响而转化为不稳定的Cd (OH) 2.
结论:
- 由地下水波动驱动的水力动力学条件改变了土壤-地下水水化环境,影响了Pb和Cd的迁移和转化.
- 机制包括表面吸附,沉,替代和阴离子交换.
- 研究结果为修复具有动态地下水位的污染地点提供了关键的见解.
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