Potential Function of Added Minerals as Nucleation Sites and Effect of Humic Substances on Mineral Formation by the Nitrate-Reducing Fe(II)-Oxidizer Acidovorax sp BoFeN1
Potential Function of Added Minerals as Nucleation Sites and Effect of Humic Substances on Mineral Formation by the Nitrate-Reducing Fe(II)-Oxidizer Acidovorax sp BoFeN1
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DOI：
10.1021/es2046266
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发表时间：
2012-06-19
影响因子：
11.4
通讯作者：
Kappler, Andreas
中科院分区：
文献类型：
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作者：
Dippon, Urs;Pantke, Claudia;Kappler, Andreas
有毒金属的迁移和有机污染物在环境中的转化受到铁矿物的影响，在许多情况下甚至是控制。因此，了解影响铁矿物形成和转化的Fe（II）-氧化和Fe-（III）还原细菌的因素是至关重要的了解污染物的命运和修复技术的发展。在这项研究中，我们遵循矿物形成的硝酸盐还原Fe（II）氧化菌株Acidovorax属。BoFeN 1在结晶Fe-（III）（oxyhydr）-氧化物针铁矿，磁铁矿和赤铁矿作为潜在的成核位点的存在下。穆斯堡尔谱分析的铁-57（II）-掺入微生物生长培养基中的BoFeN 1沉淀的矿物表明，针铁矿形成的情况下，矿物添加剂，以及在针铁矿或赤铁矿的存在下。在Fe（II）氧化过程中磁铁矿矿物的存在下，除了针铁矿外，还诱导形成磁铁矿，而腐殖物质沿着磁铁矿也导致针铁矿，但没有磁铁矿。这项研究表明，矿物的形成不仅取决于水的地球化学条件，但也可以通过矿物成核点，引发沉淀的相同的底层矿物相的存在。
The mobility of toxic metals and the transformation of organic pollutants in the environment are influenced and in many cases even controlled by iron minerals. Therefore knowing the factors influencing iron mineral formation and transformation by Fe(II)-oxidizing and Fe-(III)reducing bacteria is crucial for understanding the fate of contaminants and for the development of remediation technologies. In this study we followed mineral formation by the nitrate-reducing Fe(II)-oxidizing strain Acidovorax sp. BoFeN1 in the presence of the crystalline Fe-(III) (oxyhydr)-oxides goethite, magnetite and hematite added as potential nucleation sites. Mossbauer spectroscopy analysis of minerals precipitated by BoFeN1 in Fe-57(II)-spiked microbial growth medium showed that goethite was formed in the absence of mineral additions as well as in the presence of goethite or hematite. The presence of magnetite minerals during Fe(II) oxidation induced the formation of magnetite in addition to goethite, while the addition of humic substances along with magnetite also led to goethite but no magnetite. This study showed that mineral formation not only depends on the aqueous geochemical conditions but can also be affected by the presence of mineral nucleation sites that initiate precipitation of the same underlying mineral phases.