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首页> 外文期刊>Applied Microbiology >Iron Transformations Induced by an Acid-Tolerant Desulfosporosinus Species
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Iron Transformations Induced by an Acid-Tolerant Desulfosporosinus Species

机译：耐酸的Desulfosporosinus物种诱导的铁转化

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摘要

The mineralogical transformations of Fe phases induced by an acid-tolerant, Fe(III)- and sulfate-reducing bacterium, Desulfosporosinus sp. strain GBSRB4.2 were evaluated under geochemical conditions associated with acid mine drainage-impacted systems (i.e., low pH and high Fe concentrations). X-ray powder diffractometry coupled with magnetic analysis by first-order reversal curve diagrams were used to evaluate mineral phases produced by GBSRB4.2 in media containing different ratios of Fe(II) and Fe(III). In medium containing Fe predominately in the +II oxidation state, ferrimagnetic, single-domain greigite (Fe_(3)S_(4)) was formed, but the addition of Fe(III) inhibited greigite formation. In media that contained abundant Fe(III) [as schwertmannite; Fe_(8)O_(8)(OH)_(6)SO_(4) · n H_(2)O], the activities of strain GBSRB4.2 enhanced the transformation of schwertmannite to goethite (α-FeOOH), due to the increased pH and Fe(II) concentrations that resulted from the activities of GBSRB4.2.
机译：耐酸的Fe（III）和硫酸盐还原菌Desulfosporosinus sp。诱导的Fe相的矿物学转变。在与酸性矿井排水系统有关的地球化学条件下（即低pH和高铁浓度）对GBSRB4.2菌株进行了评估。 X射线粉末衍射仪结合一阶反转曲线图进行磁分析，用于评估GBSRB4.2在含有不同比例的Fe（II）和Fe（III）的介质中产生的矿物相。在主要以+ II氧化态包含Fe的介质中，形成了亚铁磁性单畴钙锌矿（Fe_（3）S_（4）），但添加Fe（III）抑制了钙锌矿的形成。在含有大量铁（Ⅲ）的介质中（如schwertmannite; Fe_（8）O_（8）（OH）_（6）SO_（4）·n H_（2）O]，GBSRB4.2的活性增强了Schwertmannite向针铁矿（α-FeO​​OH）的转化GBSRB4.2的活性导致pH和Fe（II）浓度增加。

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