Marine sulfate - reducing bacteria cause serious corrosion of iron under electroconductive biogenic mineral crust

Iron (Fe°) corrosion in anoxic environments (e.g. inside pipelines), a process entailing considerable economic costs, is largely influenced by microorganisms, in particular sulfate-reducing bacteria (SRB). The process is characterized by formation of black crusts and metal pitting. The mechanism is...

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Main Authors: Dennis Enning, Hendrik Venzlaff, Julis Garrelfs, Hang T. Dinh, Volker Meyer, Karl Mayrhofer, Achim W. Hassel, Martin Stratmann, Friedrich Widdel
Format: Article
Language:English
Published: Environmental Microbiology 2016
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Online Access:http://repository.vnu.edu.vn/handle/VNU_123/10813
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Institution: Vietnam National University, Hanoi
Language: English
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spelling oai:112.137.131.14:VNU_123-108132017-04-05T14:10:31Z Marine sulfate - reducing bacteria cause serious corrosion of iron under electroconductive biogenic mineral crust Dennis Enning Hendrik Venzlaff Julis Garrelfs Hang T. Dinh Volker Meyer Karl Mayrhofer Achim W. Hassel Martin Stratmann Friedrich Widdel corrosion Marine - sulfate Iron (Fe°) corrosion in anoxic environments (e.g. inside pipelines), a process entailing considerable economic costs, is largely influenced by microorganisms, in particular sulfate-reducing bacteria (SRB). The process is characterized by formation of black crusts and metal pitting. The mechanism is usually explained by the corrosiveness of formed H2S, and scavenge of 'cathodic' H2 from chemical reaction of Fe° with H2O. Here we studied peculiar marine SRB that grew lithotrophically with metallic iron as the only electron donor. They degraded up to 72% of iron coupons (10 mm x 10 mm x 1 mm) within five months, which is a technologically highly relevant corrosion rate (0.7 mm Fe°/year), while conventional H2-scavenging control strains were not corrosive. The black, hard mineral crust (FeS, FeCO3, Mg/CaCO3) deposited on the corroding metal exhibited electrical conductivity (50 S m-1). This was sufficient to explain the corrosion rate by electron flow from the metal (4Fe°-> 4Fe(2+) + 8e-) through semiconductive sulfides to the crust-colonizing cells reducing sulfate (8e- + SO4(2-) + 9H+ —> HS(-) + 4H20). Hence, anaerobic microbial iron corrosion obviously by passes H2 rather than depends on it. SRB with such corrosive potential were revealed at naturally high numbers at a coastal marine sediment site. Iron coupons buried there were corroded and covered by the characteristic mineral crust. It is speculated that anaerobic biocorrosion is due to the promiscuous use of an ecophysiologically relevant catabolic trait for uptake of external electrons from abiotic or biotic sources in sediments. 2016-05-26T05:15:38Z 2016-05-26T05:15:38Z 2012-04-17 Article 1462-2920 http://repository.vnu.edu.vn/handle/VNU_123/10813 en Environmental Microbiology;14(7) application/pdf Environmental Microbiology
institution Vietnam National University, Hanoi
building VNU Library & Information Center
country Vietnam
collection VNU Digital Repository
language English
topic corrosion
Marine - sulfate
spellingShingle corrosion
Marine - sulfate
Dennis Enning
Hendrik Venzlaff
Julis Garrelfs
Hang T. Dinh
Volker Meyer
Karl Mayrhofer
Achim W. Hassel
Martin Stratmann
Friedrich Widdel
Marine sulfate - reducing bacteria cause serious corrosion of iron under electroconductive biogenic mineral crust
description Iron (Fe°) corrosion in anoxic environments (e.g. inside pipelines), a process entailing considerable economic costs, is largely influenced by microorganisms, in particular sulfate-reducing bacteria (SRB). The process is characterized by formation of black crusts and metal pitting. The mechanism is usually explained by the corrosiveness of formed H2S, and scavenge of 'cathodic' H2 from chemical reaction of Fe° with H2O. Here we studied peculiar marine SRB that grew lithotrophically with metallic iron as the only electron donor. They degraded up to 72% of iron coupons (10 mm x 10 mm x 1 mm) within five months, which is a technologically highly relevant corrosion rate (0.7 mm Fe°/year), while conventional H2-scavenging control strains were not corrosive. The black, hard mineral crust (FeS, FeCO3, Mg/CaCO3) deposited on the corroding metal exhibited electrical conductivity (50 S m-1). This was sufficient to explain the corrosion rate by electron flow from the metal (4Fe°-> 4Fe(2+) + 8e-) through semiconductive sulfides to the crust-colonizing cells reducing sulfate (8e- + SO4(2-) + 9H+ —> HS(-) + 4H20). Hence, anaerobic microbial iron corrosion obviously by passes H2 rather than depends on it. SRB with such corrosive potential were revealed at naturally high numbers at a coastal marine sediment site. Iron coupons buried there were corroded and covered by the characteristic mineral crust. It is speculated that anaerobic biocorrosion is due to the promiscuous use of an ecophysiologically relevant catabolic trait for uptake of external electrons from abiotic or biotic sources in sediments.
format Article
author Dennis Enning
Hendrik Venzlaff
Julis Garrelfs
Hang T. Dinh
Volker Meyer
Karl Mayrhofer
Achim W. Hassel
Martin Stratmann
Friedrich Widdel
author_facet Dennis Enning
Hendrik Venzlaff
Julis Garrelfs
Hang T. Dinh
Volker Meyer
Karl Mayrhofer
Achim W. Hassel
Martin Stratmann
Friedrich Widdel
author_sort Dennis Enning
title Marine sulfate - reducing bacteria cause serious corrosion of iron under electroconductive biogenic mineral crust
title_short Marine sulfate - reducing bacteria cause serious corrosion of iron under electroconductive biogenic mineral crust
title_full Marine sulfate - reducing bacteria cause serious corrosion of iron under electroconductive biogenic mineral crust
title_fullStr Marine sulfate - reducing bacteria cause serious corrosion of iron under electroconductive biogenic mineral crust
title_full_unstemmed Marine sulfate - reducing bacteria cause serious corrosion of iron under electroconductive biogenic mineral crust
title_sort marine sulfate - reducing bacteria cause serious corrosion of iron under electroconductive biogenic mineral crust
publisher Environmental Microbiology
publishDate 2016
url http://repository.vnu.edu.vn/handle/VNU_123/10813
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