持续的丰富及其高生态风险是从历史的碳化Hg-Tl采矿废弃物中发展出来的
Fengqi Zhao1, Shangyi Gu2, Qingguang Li2
1College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China.
The Science of the total environment
|August 6, 2023
概括
矿山废物造成的 (Tl) 污染仍然存在. 在再生土壤中,和铁氧化物会封存Tl,但洪水会释放它,造成持续的生态风险.
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:
- (Tl) 是一个高度有毒的污染物,引起全球关注.
- 前矿场是金属化物污染的热点,在回收几十年后也会带来风险.
- 了解TI在再生土壤中的命运对于评估生态危险至关重要.
研究的目的:
- 调查TI在采矿废物衍生的地下土壤中的地化学循环和环境命运.
- 在回收的土壤中确定固体阶段分区和Tl的种类.
- 评估底层矿山废弃物的长期TI释放潜力.
主要方法:
- 感应合等离子体质谱 (ICP-MS) 用于元素分析.
- BCR 序列提取以确定 Tl 分区.
- 射线光电子光谱 (XPS) 和电子探针微分析 (EPMA) 用于物种识别和矿物学.
主要成果:
- 地下表现出大量的 (Mn) 和 (Tl) 丰富.
- 高度的Tl与氧化物和Fe (水氧化物) 颗粒有关,表明氧化复杂化和生物矿物化.
- 矿物学代理表明氧化还原振荡和地下水波动影响了TI的移动性.
结论:
- 在再生土壤中,Mn和Fe氧化物充当了主要的Tl沉积体,通过氧化复杂化和生物矿物化将其隔离.
- 尽管有长期封存的可能性,但在洪水期间Tl的减少释放是不可避免的.
- 底层的碳化采矿废物仍然是对生态系统造成严重TI危害的持续来源.
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