从土壤DOM中氧化去除光元件及其对废弃矿区周围重金属的影响
Meifeng Zhang1, Ping Yu1, Xujing Guo2
1College of Resources and Environment, Chengdu University of Information Technology, Chengdu, 610225, China.
Environmental geochemistry and health
|December 26, 2023
概括
土壤有机物 (SOM) 氧化稳定性影响重金属 (HM) 的行为. 采矿区土壤显示出更大的SOM氧化稳定性,影响HM固定和释放,这对于环境修复至关重要.
科学领域:
- 环境化学环境化学
- 土壤科学 土壤科学
- 地质化学 地质化学
背景情况:
- 土壤有机物 (SOM) 的氧化稳定性对于了解重金属 (HM) 的环境行为至关重要.
- 土壤溶解有机物 (DOM) 特性影响HM流动性和生物可用性.
- 采矿区往往呈现出复杂的土壤条件和潜在的HM污染.
研究的目的:
- 在中国西部的不同土壤类型 (草地,森林,农田,采矿) 中研究SOM和DOM的氧化稳定性.
- 为了确定光DOM (FDOM) 组件的氧化效应.
- 评估SOM/FDOM氧化稳定性与重金属释放之间的关系.
主要方法:
- 分析土壤有机物 (SOM) 和土壤溶解有机物 (DOM) 的氧化稳定性.
- 利用同步光谱学 (SFS) 来评估光DOM (FDOM) 上的氧化效应.
- 采用第二导数,二维相关谱 (2D-COS) 和1/n功率转换用于FDOM分析.
主要成果:
- SOM的氧化稳定性顺序:矿区土壤 > 草地 > 森林土地 > 农田土壤.
- 类似蛋白质的光 (A2) 主导着土壤DOM,超过96%容易降解.
- 氧化优先去除类似蛋白质的物质,其次是类似的物质,并增加了农田土壤中Cr,Cu,Zn,Pb和Fe的释放.
结论:
- SOM和FDOM的氧化稳定性显著影响土壤中重金属的固定和释放.
- 了解这些过程为重金属污染土壤的修复提供了必要的科学指导,特别是在废弃的采矿区周围.
- 不同类型的土壤对氧化具有不同的抗性,这影响了它们保留或释放重金属的能力.
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