微生物Fe (III) 降低在pH梯度:对二次矿化和微生物社区发展的影响
Yun Seo Jang1, Yidan Zhang1, Matthew F Kirk2
1Department of Earth and Environmental Sciences, Korea University, Seoul, 02831, Republic of Korea.
Journal of environmental management
|March 8, 2025
概括
度显著影响微生物的铁减少和矿物质形成. 较低的pH值增强了不相似的降铁 (DIR) 和降铁细菌 (DIRB) 的活性,影响了像 siderite 这样的二次矿物沉.
科学领域:
- 环境微生物学 环境微生物学
- 地质化学 地质化学
- 生物地质化学生物地质化学
背景情况:
- 铁 (III) 氧化物在自然环境中至关重要,影响污染物流动性,温室气体排放和营养循环.
- 在无氧条件下的微生物异样化铁还原 (DIR) 驱动Fe (III) 溶解和二次矿化.
- 质子是DIR中的反应物,使这些过程对pH值波动敏感,但对矿化和微生物群落的影响仍未得到充分研究.
研究的目的:
- 研究初始pH和Fe (III) 矿物源对DIR,二次矿化和微生物群落结构的影响.
- 为了确定pH梯度如何影响不相似的铁还原 (DIR) 和随后的矿物质形成.
- 评估Fe (III) 矿物质 (戈石与勒皮多克罗石) 在微生物铁减少中的作用.
主要方法:
- 微观宇宙实验是使用乙酸盐作为电子捐赠体和不同的初始pH值 (6.39.0) 进行的.
- 铁III) 的来源包括戈希特和勒皮多克罗西特,并分析了铁III的减少程度和速度.
- 使用像X射线衍射这样的技术分析了固相矿物学,并使用16S rRNA基因测序对微生物群落进行了分析.
主要成果:
- 随着pH值的增加,Fe (III) 减少的速度和程度显著下降.
- 勒皮多克罗西特支持较高的DIR活性,相比于戈提特.
- 石是以较低的pH值 (6.37.7) 形成的主要次要矿物质,特别是石石,而石尽管产生Fe(II),但矿物转化有限.
- 分解降铁细菌 (DIRB) 的丰富性在较低的pH值时是最高的,并且随着pH值的上升而下降.
结论:
- 在控制DIR过程,二次矿物形成和DIRB社区发展方面,pH值是一个比Fe矿物学更主导的因素.
- 了解pH依赖DIR对于预测环境过程和设计生物修复策略至关重要.
- 该研究强调了pH,铁矿物学,微生物活动和无氧环境中的矿物沉之间的复杂相互作用.
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