铁的腐蚀是由新型无氧微生物造成的
Hang T Dinh1, Jan Kuever, Marc Mussmann
1Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, 28359 Bremen, Germany.
Nature
|February 27, 2004
概括
新的海洋细菌和古生物直接腐蚀铁,挑战在无氧腐蚀中的作用. 这些微生物为铁腐蚀机制提供了新的见解.
科学领域:
- 微生物学 微生物学
- 腐蚀科学 腐蚀科学
- 电化学 电化学 电化学
背景情况:
- 铁的无氧腐蚀是一个重要的经济问题,通常归因于减少硫酸盐的细菌 (SRB).
- 传统上,SRB被认为是通过硫化的生产和阴极的消耗引起腐蚀的.
- 由于SRB引起的无氧腐蚀的确切机制尚不完全理解,特别是不同细菌物种的作用.
研究的目的:
- 隔离和描述能够直接利用金属铁的新型海洋微生物.
- 研究这些新发现的微生物对无氧铁腐蚀的机制.
- 挑战SRB在铁腐蚀中的作用的传统理解.
主要方法:
- 使用金属铁作为唯一的电子供体,隔离海洋微生物.
- 评估孤立的Desulfobacterium类和Methanobacterium类物种的腐蚀率.
- 将新型分离物的腐蚀活性与已知的消耗的Desulfovibrio物种进行比较.
主要成果:
- 与Desulfovibrio物种相比,一种类似于Desulfobacterium的分离物体表现出与金属铁相比,硫酸盐的减少显著更快.
- 一种新型的类似甲基细菌的考古体使用铁产生甲的速度比已知的甲基生物更快.
- 这些发现表明,新型分离物比以前假设的更直接地从金属铁中吸收电子.
结论:
- 新型海洋SRB和甲基生物可以直接利用金属铁的电子.
- 这种直接的电子转移机制绕过了对的需求,为无氧腐蚀提供了新的视角.
- 该研究确定了新的微生物参与者和机制,涉及到经济上重要的铁腐蚀过程.
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