In situ characterization of Mn(II) oxidation by spores of the marine Bacillus sp strain SG-1
In situ characterization of Mn(II) oxidation by spores of the marine Bacillus sp strain SG-1
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DOI：
10.1016/s0016-7037(00)00368-9
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发表时间：
2000-08-01
影响因子：
5
通讯作者：
Villinski, JE
中科院分区：
文献类型：
--
作者：
Bargar, JR;Tebo, BM;Villinski, JE
Mn（II）的微生物氧化和随后的不溶性、反应性Mn（IV）氧化物的沉淀是环境中这些固相的主要来源，并且是天然沃茨中Mn循环的关键控制。我们已经进行了原位X射线吸收近边结构（XANES）光谱测量锰（II）氧化的海洋芽孢杆菌属的孢子。SG I菌株的氧化反应的中间体和产物的特征。观察到类似于δ-MnO（2）的Mn（IV）-氧化物以快速速率形成（在反应开始的14分钟内）。Mn（III）中间体没有出现在检测限以上（总Mn的5 - 10%），即使Mn（III）/（II，III）氧化物（MnOOH或Mn（3）O（4））在实验条件下应该比MnO（2）更稳定。这些结果表明，锰（IV）是细菌锰（II）氧化的芽孢杆菌菌株SG-1的主要产品。鉴于SG-1是锰（II）氧化细菌的一个很好的模型，这些发现有助于解释锰（IV）氧化物在水生环境中的优势。版权所有（C）2000爱思唯尔科学有限公司
Microbial oxidation of Mn(II) and subsequent precipitation of insoluble, reactive Mn(IV) oxides are primary sources of these solid phases in the environment and key controls on Mn cycling in natural waters. We have performed in situ x-ray absorption near-edge structure (XANES) spectroscopic measurements of Mn(II) oxidation by spores of the marine Bacillus sp. strain SG I to characterize the intermediates and products of the oxidation reactions. Mn(IV)-oxides resembling delta-MnO(2) were observed to form at a rapid rate (within 14 min of reaction onset). Mn(III) intermediates did not occur above detection limit (5 to 10% of total Mn), even though Mn(III)/(II,III) oxides (MnOOH or Mn(3)O(4)) should have been more stable than MnO(2) under the conditions of the experiments. These results suggest that Mn(IV) is the primary product of bacterial Mn(II) oxidation by Bacillus strain SG-1. Given that SG-1 is a good model for Mn(II)-oxidizing bacteria, these findings help to explain the predominance of Mn(IV)-oxides in aquatic environments. Copyright (C) 2000 Elsevier Science Ltd.