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使用Chironomus dilutus使用历史金矿尾矿污染的湿地沉积物对基于零价值铁的新型反应性修正物的评估

Samuel A Sequeira¹, E Emily V Chapman², Heidi Gavel²

¹Saint Mary's University, Department of Environmental Science, 923 Robie Street Halifax, Nova Scotia, B3H-3C3, Canada..

The Science of the total environment

|December 13, 2025

概括

一个新的整治策略,薄反应性修正和保护性上限 (TRaP),在受污染的湿地显著降低了和的毒性. 这种处理改善了水生无脊椎动物的生存和生长,为遗留的矿场清理提供了一个有希望的解决方案.

科学领域:

环境科学环境科学
环境化学环境化学
生态毒理学生态毒理学

背景情况:

在新斯科舍省的金矿尾矿污染了 (Hg) 和 (As) 的湿地.
这些有毒元素在盆地无脊椎动物中生物积累,造成生态风险.
历史黄金开采的遗留污染需要有效的补救策略.

研究的目的:

为了评估薄反应性修改和保护性封顶 (TRaP) 处理的有效性.
评估TRaP的限制Hg和As毒性和生物可用性的能力,以Chironomus dilutus幼虫.
为了比较TRaP的性能与未经处理的沉积物和单独的零价值铁 (ZVI) 处理.

主要方法:

一个使用TRaP的实验室实验,TRaP是二氧化砂,焦岩,零价值铁 (ZVI) 和土的复合物.
用TRaP处理受污染的湿地沉积物.
在上层水中评估溶解的甲基 (MeHg) 和As度.
对Chironomus dilutus的生存率和生长率的评估.
测量整体Hg生物积累在chironomid幼虫中的测量.

主要成果:

与未经处理的沉积物相比,TRaP处理减少了78%的溶解MeHg和99%的As.
使用TRaP,脊椎动物的生存率从45%增加到90%,增长率提高了36.5%.
在降低MeHg和增强脊柱体指标方面,TRaP的表现优于仅ZVI治疗.
奇罗诺米德的总Hg生物积累在受污染和处理的沉积物中是相似的.

结论:

对于被遗留污染的湿地生态系统来说,TRaP是一个有前途的整治策略.
治疗有效地降低了Hg和As的生物可用性和毒性.
需要进一步的实地研究来确认TRaP在现实条件下的有效性.

关键词:

亚是一种.加拿大加拿大加拿大加拿大加拿大加拿大加拿大这是一个奇罗诺米德.水星水星水星水星水星新斯科舍省新斯科舍省反应性的修改是反应性的修改.沉积物沉积物是一种沉积物.

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