Characterization of iron oxide nanoparticle films at the air–water interface in Arctic tundra waters
Here, massive amounts of organic carbon have accumulated in Arctic permafrost and soils due to anoxic and low temperature conditions that limit aerobic microbial respiration. Alternative electron acceptors are thus required for microbes to degrade organic carbon in these soils. Iron or iron oxides h...
Published in: | Science of The Total Environment |
---|---|
Main Authors: | , , , , , , , , |
Language: | unknown |
Published: |
2019
|
Subjects: | |
Online Access: | http://www.osti.gov/servlets/purl/1437920 https://www.osti.gov/biblio/1437920 https://doi.org/10.1016/j.scitotenv.2018.03.332 |
id |
ftosti:oai:osti.gov:1437920 |
---|---|
record_format |
openpolar |
spelling |
ftosti:oai:osti.gov:1437920 2023-07-30T04:00:54+02:00 Characterization of iron oxide nanoparticle films at the air–water interface in Arctic tundra waters Jubb, Aaron M. Eskelsen, Jeremy R. Yin, Xiangping Lisa Zheng, Jianqiu Philben, Michael J. Pierce, Eric M. Graham, David E. Wullschleger, Stan D. Gu, Baohua 2019-04-04 application/pdf http://www.osti.gov/servlets/purl/1437920 https://www.osti.gov/biblio/1437920 https://doi.org/10.1016/j.scitotenv.2018.03.332 unknown http://www.osti.gov/servlets/purl/1437920 https://www.osti.gov/biblio/1437920 https://doi.org/10.1016/j.scitotenv.2018.03.332 doi:10.1016/j.scitotenv.2018.03.332 54 ENVIRONMENTAL SCIENCES 2019 ftosti https://doi.org/10.1016/j.scitotenv.2018.03.332 2023-07-11T09:25:51Z Here, massive amounts of organic carbon have accumulated in Arctic permafrost and soils due to anoxic and low temperature conditions that limit aerobic microbial respiration. Alternative electron acceptors are thus required for microbes to degrade organic carbon in these soils. Iron or iron oxides have been recognized to play an important role in carbon cycle processes in Arctic soils, although the exact form and role as an electron acceptor or donor remain poorly understood. Here, Arctic biofilms collected during the summers of 2016 and 2017 from tundra surface waters on the Seward Peninsula of western Alaska were characterized with a suite of microscopic and spectroscopic methods. We hypothesized that these films contain redox-active minerals bound to biological polymers. The major components of the films were found to be iron oxide nanoparticle aggregates associated with extracellular polymeric substances. The observed mineral phases varied between films collected in different years with magnetite (Fe 2+ Fe 2 3+ O 4 ) nanoparticles (<5 nm) predominantly identified in the 2016 films, while for films collected in 2017 ferrihydrite-like amorphous iron oxyhydroxides were found. While the exact formation mechanism of these Artic iron oxide films remains to be explored, the presence of magnetite and other iron oxide/oxyhydroxide nanoparticles at the air–water interface may represent a previously unknown source of electron acceptors for continual anaerobic microbial respiration of organic carbon within poorly drained Arctic tundra. Other/Unknown Material Arctic permafrost Seward Peninsula Tundra Alaska SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic Science of The Total Environment 633 1460 1468 |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
spellingShingle |
54 ENVIRONMENTAL SCIENCES Jubb, Aaron M. Eskelsen, Jeremy R. Yin, Xiangping Lisa Zheng, Jianqiu Philben, Michael J. Pierce, Eric M. Graham, David E. Wullschleger, Stan D. Gu, Baohua Characterization of iron oxide nanoparticle films at the air–water interface in Arctic tundra waters |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
Here, massive amounts of organic carbon have accumulated in Arctic permafrost and soils due to anoxic and low temperature conditions that limit aerobic microbial respiration. Alternative electron acceptors are thus required for microbes to degrade organic carbon in these soils. Iron or iron oxides have been recognized to play an important role in carbon cycle processes in Arctic soils, although the exact form and role as an electron acceptor or donor remain poorly understood. Here, Arctic biofilms collected during the summers of 2016 and 2017 from tundra surface waters on the Seward Peninsula of western Alaska were characterized with a suite of microscopic and spectroscopic methods. We hypothesized that these films contain redox-active minerals bound to biological polymers. The major components of the films were found to be iron oxide nanoparticle aggregates associated with extracellular polymeric substances. The observed mineral phases varied between films collected in different years with magnetite (Fe 2+ Fe 2 3+ O 4 ) nanoparticles (<5 nm) predominantly identified in the 2016 films, while for films collected in 2017 ferrihydrite-like amorphous iron oxyhydroxides were found. While the exact formation mechanism of these Artic iron oxide films remains to be explored, the presence of magnetite and other iron oxide/oxyhydroxide nanoparticles at the air–water interface may represent a previously unknown source of electron acceptors for continual anaerobic microbial respiration of organic carbon within poorly drained Arctic tundra. |
author |
Jubb, Aaron M. Eskelsen, Jeremy R. Yin, Xiangping Lisa Zheng, Jianqiu Philben, Michael J. Pierce, Eric M. Graham, David E. Wullschleger, Stan D. Gu, Baohua |
author_facet |
Jubb, Aaron M. Eskelsen, Jeremy R. Yin, Xiangping Lisa Zheng, Jianqiu Philben, Michael J. Pierce, Eric M. Graham, David E. Wullschleger, Stan D. Gu, Baohua |
author_sort |
Jubb, Aaron M. |
title |
Characterization of iron oxide nanoparticle films at the air–water interface in Arctic tundra waters |
title_short |
Characterization of iron oxide nanoparticle films at the air–water interface in Arctic tundra waters |
title_full |
Characterization of iron oxide nanoparticle films at the air–water interface in Arctic tundra waters |
title_fullStr |
Characterization of iron oxide nanoparticle films at the air–water interface in Arctic tundra waters |
title_full_unstemmed |
Characterization of iron oxide nanoparticle films at the air–water interface in Arctic tundra waters |
title_sort |
characterization of iron oxide nanoparticle films at the air–water interface in arctic tundra waters |
publishDate |
2019 |
url |
http://www.osti.gov/servlets/purl/1437920 https://www.osti.gov/biblio/1437920 https://doi.org/10.1016/j.scitotenv.2018.03.332 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost Seward Peninsula Tundra Alaska |
genre_facet |
Arctic permafrost Seward Peninsula Tundra Alaska |
op_relation |
http://www.osti.gov/servlets/purl/1437920 https://www.osti.gov/biblio/1437920 https://doi.org/10.1016/j.scitotenv.2018.03.332 doi:10.1016/j.scitotenv.2018.03.332 |
op_doi |
https://doi.org/10.1016/j.scitotenv.2018.03.332 |
container_title |
Science of The Total Environment |
container_volume |
633 |
container_start_page |
1460 |
op_container_end_page |
1468 |
_version_ |
1772811580931571712 |