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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2020
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ftuniaarhuspubl:oai:pure.atira.dk:publications/61118d93-bbc3-4516-b3a4-26354272fd52 2023-12-31T10:04:00+01:00 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 application/pdf https://pure.au.dk/portal/da/publications/reactivity-of-iron-minerals-in-the-seabed-toward-microbial-reduction--a-comparison-of-different-extraction-techniques(61118d93-bbc3-4516-b3a4-26354272fd52).html https://doi.org/10.1080/01490451.2019.1679291 https://pure.au.dk/ws/files/231516048/Reactivity_of_Iron_Minerals_in_the_Seabed_Toward_Microbial_Reduction_A_Comparison_of_Different_Extraction_Techniques.pdf http://www.scopus.com/inward/record.url?scp=85076456725&partnerID=8YFLogxK eng eng https://pure.au.dk/portal/da/publications/reactivity-of-iron-minerals-in-the-seabed-toward-microbial-reduction--a-comparison-of-different-extraction-techniques(61118d93-bbc3-4516-b3a4-26354272fd52).html info:eu-repo/semantics/openAccess Laufer , K , Michaud , A B , Røy , H & Jørgensen , B B 2020 , ' Reactivity of Iron Minerals in the Seabed Toward Microbial Reduction – A Comparison of Different Extraction Techniques ' , Geomicrobiology Journal , vol. 37 , no. 2 , pp. 170-189 . https://doi.org/10.1080/01490451.2019.1679291 Arctic Fe reduction iron sediment sulfate reduction Svalbard article 2020 ftuniaarhuspubl https://doi.org/10.1080/01490451.2019.1679291 2023-12-07T00:04:01Z 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 Arctic Kongsfjord* Kongsfjorden Svalbard Aarhus University: Research Geomicrobiology Journal 37 2 170 189 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Arctic Fe reduction iron sediment sulfate reduction Svalbard |
spellingShingle |
Arctic Fe reduction iron sediment sulfate reduction Svalbard 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 |
Arctic Fe reduction iron sediment sulfate reduction Svalbard |
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. |
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 |
publishDate |
2020 |
url |
https://pure.au.dk/portal/da/publications/reactivity-of-iron-minerals-in-the-seabed-toward-microbial-reduction--a-comparison-of-different-extraction-techniques(61118d93-bbc3-4516-b3a4-26354272fd52).html https://doi.org/10.1080/01490451.2019.1679291 https://pure.au.dk/ws/files/231516048/Reactivity_of_Iron_Minerals_in_the_Seabed_Toward_Microbial_Reduction_A_Comparison_of_Different_Extraction_Techniques.pdf http://www.scopus.com/inward/record.url?scp=85076456725&partnerID=8YFLogxK |
genre |
Arctic Kongsfjord* Kongsfjorden Svalbard |
genre_facet |
Arctic Kongsfjord* Kongsfjorden Svalbard |
op_source |
Laufer , K , Michaud , A B , Røy , H & Jørgensen , B B 2020 , ' Reactivity of Iron Minerals in the Seabed Toward Microbial Reduction – A Comparison of Different Extraction Techniques ' , Geomicrobiology Journal , vol. 37 , no. 2 , pp. 170-189 . https://doi.org/10.1080/01490451.2019.1679291 |
op_relation |
https://pure.au.dk/portal/da/publications/reactivity-of-iron-minerals-in-the-seabed-toward-microbial-reduction--a-comparison-of-different-extraction-techniques(61118d93-bbc3-4516-b3a4-26354272fd52).html |
op_rights |
info:eu-repo/semantics/openAccess |
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 |
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1786828459080679424 |