| Cronobacter sakazakii还原作用对针铁矿晶体结构的影响 |
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| 引用本文： | 王浩然,杨晓雪,丁竑瑞,李艳,朱云,王长秋,鲁安怀.Cronobacter sakazakii还原作用对针铁矿晶体结构的影响[J].地学前缘,2013,20(3):147-153. |
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| 作者姓名： | 王浩然 杨晓雪 丁竑瑞 李艳 朱云 王长秋 鲁安怀 |
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| 作者单位： | 1. 造山带与地壳演化教育部重点实验室; 北京大学 地球与空间科学学院, 北京 100871;
2. 国家地质实验测试中心, 北京 100037 |
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| 基金项目： | 国家自然科学基金重点资助项目，国家自然科学基金项目，大庆油田对外协作计划项目 |
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| 摘 要： | 厌氧条件下，Cronobacter sakazakii以乙酸钠作为电子供体，针铁矿中Fe(Ⅲ)作为电子受体进行生命活动，其新陈代谢过程伴随Fe(Ⅲ)的还原。细菌增殖和稳定生长过程中不停还原针铁矿并大量累积Fe(Ⅱ)；当细菌衰亡时，Fe(Ⅱ)的产生随之减缓；细菌的活动停止时，Fe(Ⅱ)不再积累并最终保持稳定。同步辐射XRD测试表明，微生物还原作用后针铁矿出现了一系列新衍射峰：4.8、6.03、6.13、6.84、7.7和11.4 峰，可能形成具层状结构的新物相。在XANES图谱中Fe主吸收峰向低能量方向移动1 eV，边前峰峰位中心向低能量方向移动且峰面积减小，表明Cronobacter sakazakii的异化Fe(Ⅲ)还原作用使针铁矿中Fe氧化态降低，矿物晶体结构发生了变化。
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| 关 键 词： | 异化Fe(Ⅲ)还原菌 针铁矿 Fe(Ⅲ)还原率 同步辐射XRD XANES |
| 收稿时间： | 2013-02-20 |
| 修稿时间： | 2013-03-20 |
The reduction effect of Cronobacter sakazakii on crystal structure of goethite |
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| WANG Haoran,YANG Xiaoxue,DING Hongrui,LI Yan,ZHU Yun,WANG Changqiu,LU Anhuai.The reduction effect of Cronobacter sakazakii on crystal structure of goethite[J].Earth Science Frontiers,2013,20(3):147-153. |
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| Authors: | WANG Haoran YANG Xiaoxue DING Hongrui LI Yan ZHU Yun WANG Changqiu LU Anhuai |
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| Institution: | 1, 1.Key Laboratory of Orogenic Belts and Crustal Evolution;School of Earth and Space Sciences,Peking University,Beijing 100871,China 2.National Research Center for Geoanalysis,Beijing 100037,China |
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| Abstract: | Under anaerobic cultivation,using sodium acetate as the electron donor and Fe(Ⅲ) in goethite as electron acceptor,Cronobacter sakazakii can reduce Fe(Ⅲ) and use the energy for its metabolism.In proliferation and stable growth period the bacteria reduce the goethite rapidly and the Fe(Ⅱ) is accumulated;in the decline period of the bacteria,the generation of Fe(Ⅱ) is slow down;when the activities of bacteria stop,Fe(Ⅱ) is no longer accumulated and ultimately keep stable.Synchrotron radiation XRD of the products of the interaction of bacteria and goethite shows a series of new peaks: 4.8,6.03,6.13,6.84,7.7 and 11.4 ,and new minerals with layered structure may be formed.The main absorption peaks of XANES shift toward the lower energy about 1 eV.The centroid energy of the pre-edge peaks moves toward the lower energy,and the integrated intensity is reduced.Because of the reduction of Cronobacter sakazakii,the oxidizability of Fe is lower and the structure of goethite has been changed. |
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| Keywords: | dissimilatory Fe(Ⅲ) reduction microorganisms goethite reduction rate of Fe(Ⅲ) synchrotron radiation XRD XANES |
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