Reactivity of Iron Minerals in the Seabed Toward Microbial Reduction – A Comparison of Different Extraction Techniques
Dissimilatory iron reduction and sulfate reduction are the most important processes for anaerobic mineralization of organic carbon in marine sediments. The thermodynamics and kinetics of microbial Fe(III) reduction depend on the characteristics of the Fe(III) minerals, which influence the potential...
Published in: | Geomicrobiology Journal |
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2020
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Online Access: | https://oceanrep.geomar.de/id/eprint/48708/ https://oceanrep.geomar.de/id/eprint/48708/1/Laufer.pdf https://doi.org/10.1080/01490451.2019.1679291 |
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ftoceanrep:oai:oceanrep.geomar.de:48708 2023-05-15T17:05:16+02:00 Reactivity of Iron Minerals in the Seabed Toward Microbial Reduction – A Comparison of Different Extraction Techniques Laufer, Katja Michaud, Alexander B. Røy, Hans Jørgensen, Bo B. 2020 text https://oceanrep.geomar.de/id/eprint/48708/ https://oceanrep.geomar.de/id/eprint/48708/1/Laufer.pdf https://doi.org/10.1080/01490451.2019.1679291 en eng Taylor & Francis https://oceanrep.geomar.de/id/eprint/48708/1/Laufer.pdf Laufer, K., Michaud, A. B. , Røy, H. and Jørgensen, B. B. (2020) Reactivity of Iron Minerals in the Seabed Toward Microbial Reduction – A Comparison of Different Extraction Techniques. Geomicrobiology Journal, 37 (2). pp. 170-189. DOI 10.1080/01490451.2019.1679291 <https://doi.org/10.1080/01490451.2019.1679291>. doi:10.1080/01490451.2019.1679291 info:eu-repo/semantics/restrictedAccess Article PeerReviewed info:eu-repo/semantics/article 2020 ftoceanrep https://doi.org/10.1080/01490451.2019.1679291 2023-04-07T15:48:59Z Dissimilatory iron reduction and sulfate reduction are the most important processes for anaerobic mineralization of organic carbon in marine sediments. The thermodynamics and kinetics of microbial Fe(III) reduction depend on the characteristics of the Fe(III) minerals, which influence the potential of Fe(III)-reducers to compete with sulfate-reducers for common organic substrates. In the present study, we tested different methods to quantify and characterize microbially reducible Fe(III) in sediments from a transect in Kongsfjorden, Svalbard, using different standard sequential endpoint extractions and time-course extractions with either ascorbate or a Fe(III)-reducing microbial culture. Similar trends of increasing ‘reactive Fe’ content of the sediment along the fjord transect were found using the different extraction methods. However, the total amount of ‘reactive Fe’ extracted differed between the methods, due to different Fe dissolution mechanisms and different targeted Fe fractions. Time-course extractions additionally provided information on the reactivity and heterogeneity of the extracted Fe(III) minerals, which also impact the favorability for microbial reduction. Our results show which fractions of the existing Fe extraction protocols should be considered ‘reactive’ in the sense of being favorable for microbial Fe(III) reduction, which is important in studies on early diagenesis in marine sediments. Article in Journal/Newspaper Kongsfjord* Kongsfjorden Svalbard OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Svalbard Geomicrobiology Journal 37 2 170 189 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Dissimilatory iron reduction and sulfate reduction are the most important processes for anaerobic mineralization of organic carbon in marine sediments. The thermodynamics and kinetics of microbial Fe(III) reduction depend on the characteristics of the Fe(III) minerals, which influence the potential of Fe(III)-reducers to compete with sulfate-reducers for common organic substrates. In the present study, we tested different methods to quantify and characterize microbially reducible Fe(III) in sediments from a transect in Kongsfjorden, Svalbard, using different standard sequential endpoint extractions and time-course extractions with either ascorbate or a Fe(III)-reducing microbial culture. Similar trends of increasing ‘reactive Fe’ content of the sediment along the fjord transect were found using the different extraction methods. However, the total amount of ‘reactive Fe’ extracted differed between the methods, due to different Fe dissolution mechanisms and different targeted Fe fractions. Time-course extractions additionally provided information on the reactivity and heterogeneity of the extracted Fe(III) minerals, which also impact the favorability for microbial reduction. Our results show which fractions of the existing Fe extraction protocols should be considered ‘reactive’ in the sense of being favorable for microbial Fe(III) reduction, which is important in studies on early diagenesis in marine sediments. |
format |
Article in Journal/Newspaper |
author |
Laufer, Katja Michaud, Alexander B. Røy, Hans Jørgensen, Bo B. |
spellingShingle |
Laufer, Katja Michaud, Alexander B. Røy, Hans Jørgensen, Bo B. Reactivity of Iron Minerals in the Seabed Toward Microbial Reduction – A Comparison of Different Extraction Techniques |
author_facet |
Laufer, Katja Michaud, Alexander B. Røy, Hans Jørgensen, Bo B. |
author_sort |
Laufer, Katja |
title |
Reactivity of Iron Minerals in the Seabed Toward Microbial Reduction – A Comparison of Different Extraction Techniques |
title_short |
Reactivity of Iron Minerals in the Seabed Toward Microbial Reduction – A Comparison of Different Extraction Techniques |
title_full |
Reactivity of Iron Minerals in the Seabed Toward Microbial Reduction – A Comparison of Different Extraction Techniques |
title_fullStr |
Reactivity of Iron Minerals in the Seabed Toward Microbial Reduction – A Comparison of Different Extraction Techniques |
title_full_unstemmed |
Reactivity of Iron Minerals in the Seabed Toward Microbial Reduction – A Comparison of Different Extraction Techniques |
title_sort |
reactivity of iron minerals in the seabed toward microbial reduction – a comparison of different extraction techniques |
publisher |
Taylor & Francis |
publishDate |
2020 |
url |
https://oceanrep.geomar.de/id/eprint/48708/ https://oceanrep.geomar.de/id/eprint/48708/1/Laufer.pdf https://doi.org/10.1080/01490451.2019.1679291 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Kongsfjord* Kongsfjorden Svalbard |
genre_facet |
Kongsfjord* Kongsfjorden Svalbard |
op_relation |
https://oceanrep.geomar.de/id/eprint/48708/1/Laufer.pdf Laufer, K., Michaud, A. B. , Røy, H. and Jørgensen, B. B. (2020) Reactivity of Iron Minerals in the Seabed Toward Microbial Reduction – A Comparison of Different Extraction Techniques. Geomicrobiology Journal, 37 (2). pp. 170-189. DOI 10.1080/01490451.2019.1679291 <https://doi.org/10.1080/01490451.2019.1679291>. doi:10.1080/01490451.2019.1679291 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1080/01490451.2019.1679291 |
container_title |
Geomicrobiology Journal |
container_volume |
37 |
container_issue |
2 |
container_start_page |
170 |
op_container_end_page |
189 |
_version_ |
1766059722117480448 |