Corrosion of iron by iodide-oxidizing bacteria isolated from brine in an iodine production facility.
Corrosion of iron by iodide-oxidizing bacteria isolated from brine in an iodine production facility.
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从碘生产设施中的盐水中分离出的碘化物氧化细菌对铁的腐蚀。
DOI：
10.1007/s00248-014-0438-x
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
and Shigeaki Harayama.
中科院分区：
文献类型：
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作者：
Satoshi Wakai;Kimio Ito;Takao Iino;Yasuyoshi Tomoe;Koji Mori;and Shigeaki Harayama.
元素碘在日本是从地下卤水(化石咸水)中生产的。在日本千叶的一家碘生产设施中，用于盐水输送的碳素钢管被发现比其他设施的钢管腐蚀得更快。通过将碳钢试片浸泡在“天然”和“过滤灭菌”的盐水样品中，检测了该设施中含碘卤水的腐蚀活性。浸泡在天然盐水中的试片中的铁的溶出量是过滤灭菌盐水中的三到四倍。变性梯度凝胶电泳法分析表明，在含优惠券的天然卤水样品中，碘化物氧化细菌(IOBS)占优势。在被腐蚀的管道内表面的腐蚀沉积物中也发现了IOBS。这些结果有力地表明IOBS参与了碳钢管道的腐蚀。从卤水样品中分离的6株细菌中，有4株能够将碘离子(I-−)氧化为分子碘(I2)，并进一步将这些菌株划分为两个类群。对来自两组的每一株菌株的铁腐蚀活性进行了检测。在碘化钾存在下，两种菌株都以浓度依赖的方式腐蚀铁。这是第一份提供直接证据证明IOBS与铁腐蚀有关的报告。此外，还讨论了IOBS腐蚀铁的可能机制。
Elemental iodine is produced in Japan from underground brine (fossil salt water). Carbon steel pipes in an iodine production facility at Chiba, Japan, for brine conveyance were found to corrode more rapidly than those in other facilities. The corroding activity of iodide-containing brine from the facility was examined by immersing carbon steel coupons in “native” and “filter-sterilized” brine samples. The dissolution of iron from the coupons immersed in native brine was threefold to fourfold higher than that in the filter-sterilized brine. Denaturing gradient gel electrophoresis analyses revealed that iodide-oxidizing bacteria (IOBs) were predominant in the coupon-containing native brine samples. IOBs were also detected in a corrosion deposit on the inner surface of a corroded pipe. These results strongly suggested the involvement of IOBs in the corrosion of the carbon steel pipes. Of the six bacterial strains isolated from a brine sample, four were capable of oxidizing iodide ion (I−) into molecular iodine (I2), and these strains were further phylogenetically classified into two groups. The iron-corroding activity of each of the isolates from the two groups was examined. Both strains corroded iron in the presence of potassium iodide in a concentration-dependent manner. This is the first report providing direct evidence that IOBs are involved in iron corrosion. Further, possible mechanisms by which IOBs corrode iron are discussed.