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Mackenzie Russell¹, John Gunn², Gauri Prabhakar³

¹CanmetMINING, Natural Resources Canada, Ottawa, ON, Canada; School of Natural Sciences, Vale Living With Lakes Centre, Laurentian University, Sudbury, ON, Canada.

Ecotoxicology and environmental safety

|September 6, 2025

概括

酸性矿井排水 (AMD) 的影响令人担忧,但研究表明,补救工作可能会减少对气候驱动干旱和重新湿事件的脆弱性. 沉积物实验显示,干旱期间会释放金属化物,但石灰处理会减轻这些影响.

科学领域:

环境科学
地质化学
环境修复

背景情况:

酸性矿井排水 (AMD) 构成全球环境风险,因气候驱动的干旱和重新湿事件而加剧.
安大略省萨德伯里地区具有丰富的采矿历史,特别容易受到干旱引起的AMD影响.
萨德伯里的Frood下水域受到重点关注,因为它受到矿山影响,并持续考虑干旱/洪水管理问题.

研究的目的:

研究干旱复湿周期对Frood水域沉积物中的金属化物释放的影响.
评估干燥前石灰处理在重新湿过程中缓解金属化物动员的有效性.
根据现有的补救行动,评估下水域对气候影响的整体脆弱性.

主要方法:

基于实验室的干燥和重新灌实验使用尼克莱德湿地的沉积物核心.
在各种干旱时间 (0, 30, 60 天) 和石灰处理条件下分析沉积物孔水中的金属度 (Ni,Cu,Cd,Co).
统计分析 (RM ANOVA) 来确定干旱和处理对金属度的意义.

主要成果:

与预期相反,干旱复湿周期不会导致显著的重新酸化 (平均pH值为7.25±0.20).
与对照组相比,长期干旱 (60天) 导致大量的金属化物释放,包括Ni (~100x),Cu (~10x),Cd (~65x) 和Co (~200x).
在重新浸泡后,预干燥石灰的应用显著降低了溶解金属的度,特别是Cd,Co,Cu和Ni.

结论:

矿场现有的补救工作似乎减少了水下流域对气候驱动的AMD影响的敏感性.
虽然干旱可以从沉积物中调动金属,但石灰处理为缓解这些释放提供了有希望的策略.
进一步的研究和适应性管理策略对于应对矿业影响的气候变化地区至关重要.

关键词:

气候变化干旱情况石灰化金属化物沉积物

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