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...
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ftdatacite:10.6084/m9.figshare.10029257 2023-05-15T17:05:13+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. 2019 https://dx.doi.org/10.6084/m9.figshare.10029257 https://tandf.figshare.com/articles/Reactivity_of_Iron_Minerals_in_the_Seabed_Toward_Microbial_Reduction_A_Comparison_of_Different_Extraction_Techniques/10029257 unknown Taylor & Francis https://dx.doi.org/10.1080/01490451.2019.1679291 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Biochemistry Molecular Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology FOS Biological sciences 69999 Biological Sciences not elsewhere classified Text article-journal Journal contribution ScholarlyArticle 2019 ftdatacite https://doi.org/10.6084/m9.figshare.10029257 https://doi.org/10.1080/01490451.2019.1679291 2021-11-05T12:55:41Z 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. Text Kongsfjord* Kongsfjorden Svalbard DataCite Metadata Store (German National Library of Science and Technology) Svalbard |
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Biochemistry Molecular Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology FOS Biological sciences 69999 Biological Sciences not elsewhere classified |
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Biochemistry Molecular Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology FOS Biological sciences 69999 Biological Sciences not elsewhere classified 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 |
topic_facet |
Biochemistry Molecular Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology FOS Biological sciences 69999 Biological Sciences not elsewhere classified |
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 |
Text |
author |
Laufer, Katja Michaud, Alexander B. Røy, Hans Jørgensen, Bo B. |
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 |
2019 |
url |
https://dx.doi.org/10.6084/m9.figshare.10029257 https://tandf.figshare.com/articles/Reactivity_of_Iron_Minerals_in_the_Seabed_Toward_Microbial_Reduction_A_Comparison_of_Different_Extraction_Techniques/10029257 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Kongsfjord* Kongsfjorden Svalbard |
genre_facet |
Kongsfjord* Kongsfjorden Svalbard |
op_relation |
https://dx.doi.org/10.1080/01490451.2019.1679291 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.10029257 https://doi.org/10.1080/01490451.2019.1679291 |
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1766059637967159296 |