对HgSe对抗性的新见解:对无机Hg流动性的影响很小,而对微生物的潜在影响很小
Yang Zhou1, Shouying Li1, Holger Hintelmann2
1School of the Environment, Nanjing University, State Key Laboratory of Pollution Control and Resource Reuse, Nanjing, Jiangsu Province, China.
The Science of the total environment
|December 31, 2023
概括
的添加通过形成化来对抗甲基化. 然而,,.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 微生物学 微生物学
背景情况:
- 土壤中的 (Hg) 甲基化产生甲基 (MeHg),一种强大的神经毒素.
- 已知 (Se) 对抗Hg甲基化,主要是通过化 (HgSe) 的形成.
- 在环境相关的Se剂量下,关于Hg流动性和微生物甲基剂影响的数据有限.
研究的目的:
- 研究Se添加对无机Hg (IHg) 流动性的影响.
- 评估Se对微生物甲基化剂活动的影响.
- 澄清土壤中Se对Hg甲基化的对抗机制.
主要方法:
- 用Se尖的土壤实验来监测IHg的流动性.
- 测量微生物活动,包括降铁细菌 (FeRB).
- 量化MeHg生产率和Hg甲基化常数.
主要成果:
- 产生MeHg的HgSe对抗性与活性Hg甲基化率有关.
- 尽管添加了Se,但在高DOC土壤中IHg流动性保持不变.
- 在4毫克/公斤的Se添加可能会调节FeRB活动.
结论:
- 在Se-修改土壤中,IHg流动性可能不是限制因素.
- Se对微生物活动的影响,就像FeRB一样,是Hg甲基化的一个关键因素.
- 需要进一步的研究来了解Se在循环中的复杂作用.
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