Why iron wire is heated and added to sulfide reducing bacteria test?
Answers
Answer:
Sulfate-reducing bacteria (SRB) are commonly considered the main culprits of MIC ( Microbially Influenced Corrosion ) . This perception largely stems from three recurrent observations. Firstly, anoxic sulfate-rich environments (e.g. anoxic seawater) are particularly corrosive. Secondly, SRB and their characteristic corrosion product iron sulfide are ubiquitously associated with anaerobic corrosion damage and, thirdly, no other physiological group produces comparably severe corrosion damage in laboratory-grown pure cultures. However, there remain many open questions as to the underlying mechanisms and their relative contribution to corrosion.
Explanation:
On the one hand, SRB damage iron constructions indirectly through a corrosive chemical agent, hydrogen sulfide, formed by the organisms as dissimilatory product from sulfate reduction with organic compounds or hydrogen ('chemical microbially influenced corrosion', CMIC). On the other hand, certain SRB can also attack iron via withdrawal of electrons ('electrical microbially influenced corrosion', EMIC), viz. directly by metabolic coupling. Corrosion of iron by SRB is typically associated with the formation of iron sulfides (FeS) which, paradoxically, may reduce corrosion in some cases while they increase it in others. This brief review traces the historical twists in the perception of SRB-induced corrosion, considering the presently most plausible explanations as well as possible early misconceptions in the understanding of severe corrosion in anoxic, sulfate-rich environments.
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Answer!!...
On the one hand, SRB damage iron constructions indirectly through a corrosive chemical agent, hydrogen sulfide, formed by the organisms as dissimilatory product from sulfate reduction with organic compounds or hydrogen ('chemical microbially influenced corrosion', CMIC). On the other hand, certain SRB can also attack iron via withdrawal of electrons ('electrical microbially influenced corrosion', EMIC), viz. directly by metabolic coupling. Corrosion of iron by SRB is typically associated with the formation of iron sulfides (FeS) which, paradoxically, may reduce corrosion in some cases while they increase it in others. This brief review traces the historical twists in the perception of SRB-induced corrosion, considering the presently most plausible explanations as well as possible early...
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