Formation of Fe-sulfides in cultures of sulfate-reducing bacteria
Formation of Fe-sulfides in cultures of sulfate-reducing bacteria
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DOI：
10.1016/j.jhazmat.2009.10.119
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发表时间：
2010-03-15
影响因子：
13.6
通讯作者：
Tuovinen, Olli H.
中科院分区：
文献类型：
--
作者：
Gramp, Jonathan P.;Bigham, Jerry M.;Tuovinen, Olli H.
本研究的目的是在实验室条件下合成硫酸盐还原菌产生的铁硫化物。在22、45和60 ℃下生长16周的培养物中，用生物产生的硫化物沉淀铁硫化物。通过使液体培养基与Na 2S溶液反应来制备非生物对照。厌氧收集沉淀物，冷冻干燥并通过X射线衍射分析。其他分析包括总Fe和S含量、磁化率、比表面积和扫描电子显微镜。在硫酸盐还原细菌培养物中形成的主要硫化铁相为麦基诺石（FeS）和硫硅钙石（Fe 3S 4）。从22 ℃到60 ℃的温育温度的增加增强了Fe-硫化物的结晶度。一般来说，在非生物样品和mackinawite的生物材料中，英石更普遍。黄铁矿（FeS 2）也被发现在非生物沉淀。非生物样品具有更高的磁化率，因为云英岩和生物材料相比，显示出改善的结晶度。(C)2009爱思唯尔有限公司版权所有。
The purpose of this study was to synthesize Fe-sulfides produced with sulfate-reducing bacteria under experimental laboratory conditions. Fe-sulfides were precipitated with biologically produced sulfide in cultures growing at 22,45, and 60 degrees C for up to 16 weeks. Abiotic controls were prepared by reacting liquid media with Na2S solutions. Precipitates were collected anaerobically, freeze-dried and analyzed by X-ray diffraction. Additional analyses included total Fe and S content, magnetic susceptibility, specific surface area, and scanning electron microscopy. Mackinawite (FeS) and greigite (Fe3S4) were the dominant iron sulfide phases formed in sulfate-reducing bacterial cultures. An increase in the incubation temperature from 22 to 60,C enhanced the crystallinity of the Fe-sulfides. Generally, greigite was more prevalent in abiotic samples and mackinawite in biogenic materials. Pyrite (FeS2) was also found in abiotic precipitates. Abiotic samples had a higher magnetic susceptibility because of the greigite and displayed improved crystallinity compared to biotic materials. (C) 2009 Elsevier B.V. All rights reserved.