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首页> 美国卫生研究院文献>Applied and Environmental Microbiology >Effect of Phosphate on the Corrosion of Carbon Steel and on the Composition of Corrosion Products in Two-Stage Continuous Cultures of Desulfovibrio desulfuricans
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Effect of Phosphate on the Corrosion of Carbon Steel and on the Composition of Corrosion Products in Two-Stage Continuous Cultures of Desulfovibrio desulfuricans

机译：磷酸盐对脱硫脱硫弧菌二阶段连续培养中碳钢腐蚀和腐蚀产物组成的影响

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摘要

A field isolate of Desulfovibrio desulfuricans was grown in defined medium in a two-stage continuous culture apparatus with different concentrations of phosphate in the feed medium. The first state (V1) was operated as a conventional chemostat (D = 0.045 h−1) that was limited in energy source (lactate) or phosphate. The second stage (V2) received effluent from V1 but no additional nutrients, and contained a healthy population of transiently starved or resting cells. An increase in the concentration of phosphate in the medium fed to V1 resulted in increased corrosion rates of carbon steel in both V1 and V2. Despite the more rapid corrosion observed in growing cultures relative to that in resting cultures, corrosion products that were isolated under strictly anaerobic conditions from the two culture modes had similar bulk compositions which varied with the phosphate content of the medium. Crystalline mackinawite (Fe9S8), vivianite [Fe3(PO4)2 · 8H2O], and goethite [FeO(OH)] were detected in amounts which varied with the culture conditions. Chemical analyses indicated that the S in the corrosion product was almost exclusively in the form of sulfides, while the P was present both as phosphate and as unidentified components, possibly reduced P species. Some differential localization of S and P was observed in intact corrosion products. Cells from lactate-limited, but not from phosphate-limited, cultures contained intracellular granules that were enriched in P and Fe. The results are discussed in terms of several proposed mechanisms of microbiologically influenced corrosion.
机译：脱硫脱硫弧菌的田间分离物在两阶段连续培养设备的特定培养基中生长，进料培养基中磷酸盐的浓度不同。第一状态（V1）作为常规的恒化器（D = 0.045 hs-1）受到能量（乳酸）或磷酸盐的限制。第二阶段（V2）从V1接收污水，但没有其他营养，并且含有健康的短暂饥饿或静止细胞。送入V1的介质中磷酸盐浓度的增加导致V1和V2中碳钢的腐蚀速率增加。尽管在生长的培养物中观察到比在静息培养中观察到的腐蚀更迅速，但是在严格厌氧条件下从两种培养模式中分离出的腐蚀产物具有相似的总体组成，其随培养基的磷酸盐含量而变化。检出了结晶马基钠石（Fe9S8），堇青石[Fe3（PO4）2·8H2O]和针铁矿[FeO（OH）]，其含量随培养条件而变化。化学分析表明，腐蚀产物中的S几乎仅以硫化物形式存在，而P既以磷酸盐形式存在，又以未确定的组分形式存在，可能还原了P物质。在完整的腐蚀产物中观察到了S和P的一些局部分布。来自乳酸限制而不是磷酸盐限制的培养物中的细胞含有富含P和Fe的细胞内颗粒。根据几种提议的微生物影响的腐蚀机理讨论了结果。

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