The Physicochemical Speciation of Dissolved Iron in the Bering Sea, Alaska
The physicochemical speciation of dissolved iron (Fe) across natural dissolved Fe gradients in the oceanic and shelf domains of the southeastern Bering Sea was examined in surface and subsurface samples using competitive ligand exchange‐adsorptive cathodic stripping voltammetry with the added ligand...
Published in: | Limnology and Oceanography |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Digital Commons @ University of South Florida
2007
|
Subjects: | |
Online Access: | https://digitalcommons.usf.edu/msc_facpub/620 https://doi.org/10.4319/lo.2007.52.5.1800 |
id |
ftunisfloridatam:oai:digitalcommons.usf.edu:msc_facpub-1618 |
---|---|
record_format |
openpolar |
spelling |
ftunisfloridatam:oai:digitalcommons.usf.edu:msc_facpub-1618 2023-05-15T15:43:35+02:00 The Physicochemical Speciation of Dissolved Iron in the Bering Sea, Alaska Buck, Kristen N. Bruland, Kenneth W. 2007-09-27T07:00:00Z https://digitalcommons.usf.edu/msc_facpub/620 https://doi.org/10.4319/lo.2007.52.5.1800 unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/msc_facpub/620 https://doi.org/10.4319/lo.2007.52.5.1800 Marine Science Faculty Publications Life Sciences article 2007 ftunisfloridatam https://doi.org/10.4319/lo.2007.52.5.1800 2021-10-09T07:50:02Z The physicochemical speciation of dissolved iron (Fe) across natural dissolved Fe gradients in the oceanic and shelf domains of the southeastern Bering Sea was examined in surface and subsurface samples using competitive ligand exchange‐adsorptive cathodic stripping voltammetry with the added ligand salicylaldoxime. Two ligand classes were measured in all samples, a stronger L1 ligand class and a weaker L2 ligand class. Conditional stability constants for both ligand classes were comparable between surface and subsurface samples, with mean log KcondFeL1,Fe0 = 11.5 ± 0.3 and mean log KcondFeL2,Fe0 = 10.3 ± 0.3 in surface samples, and mean log KcondFeL1,Fe0 = 11.4 ± 0.2 with a weaker ligand and mean log KcondFeL2,Fe0 of 10.2 ± 0.2 in subsurface samples. The concentrations of dissolved Fe were strongly correlated with ambient stronger L1 ligand concentrations for all samples with dissolved Fe concentrations greater than 0.2 nmol L−1. In samples with dissolved Fe concentrations less than 0.2 nmol L−1, large and variable excesses of L1 ligand concentrations were measured, coincident with observed Fe stress or limitation on the ambient phytoplankton. These observations suggest that the phytoplankton community is readily able to access dissolved Fe from the FeL1 complex, resulting in excess L1 in these waters. The available speciation data from other sources indicate that a significant correlation exists between dissolved Fe and L1 ligand concentrations in samples with intermediate dissolved Fe, and this is a seemingly ubiquitous feature of dissolved Fe cycling in the marine environment. Article in Journal/Newspaper Bering Sea Alaska Digital Commons University of South Florida (USF) Bering Sea Limnology and Oceanography 52 5 1800 1808 |
institution |
Open Polar |
collection |
Digital Commons University of South Florida (USF) |
op_collection_id |
ftunisfloridatam |
language |
unknown |
topic |
Life Sciences |
spellingShingle |
Life Sciences Buck, Kristen N. Bruland, Kenneth W. The Physicochemical Speciation of Dissolved Iron in the Bering Sea, Alaska |
topic_facet |
Life Sciences |
description |
The physicochemical speciation of dissolved iron (Fe) across natural dissolved Fe gradients in the oceanic and shelf domains of the southeastern Bering Sea was examined in surface and subsurface samples using competitive ligand exchange‐adsorptive cathodic stripping voltammetry with the added ligand salicylaldoxime. Two ligand classes were measured in all samples, a stronger L1 ligand class and a weaker L2 ligand class. Conditional stability constants for both ligand classes were comparable between surface and subsurface samples, with mean log KcondFeL1,Fe0 = 11.5 ± 0.3 and mean log KcondFeL2,Fe0 = 10.3 ± 0.3 in surface samples, and mean log KcondFeL1,Fe0 = 11.4 ± 0.2 with a weaker ligand and mean log KcondFeL2,Fe0 of 10.2 ± 0.2 in subsurface samples. The concentrations of dissolved Fe were strongly correlated with ambient stronger L1 ligand concentrations for all samples with dissolved Fe concentrations greater than 0.2 nmol L−1. In samples with dissolved Fe concentrations less than 0.2 nmol L−1, large and variable excesses of L1 ligand concentrations were measured, coincident with observed Fe stress or limitation on the ambient phytoplankton. These observations suggest that the phytoplankton community is readily able to access dissolved Fe from the FeL1 complex, resulting in excess L1 in these waters. The available speciation data from other sources indicate that a significant correlation exists between dissolved Fe and L1 ligand concentrations in samples with intermediate dissolved Fe, and this is a seemingly ubiquitous feature of dissolved Fe cycling in the marine environment. |
format |
Article in Journal/Newspaper |
author |
Buck, Kristen N. Bruland, Kenneth W. |
author_facet |
Buck, Kristen N. Bruland, Kenneth W. |
author_sort |
Buck, Kristen N. |
title |
The Physicochemical Speciation of Dissolved Iron in the Bering Sea, Alaska |
title_short |
The Physicochemical Speciation of Dissolved Iron in the Bering Sea, Alaska |
title_full |
The Physicochemical Speciation of Dissolved Iron in the Bering Sea, Alaska |
title_fullStr |
The Physicochemical Speciation of Dissolved Iron in the Bering Sea, Alaska |
title_full_unstemmed |
The Physicochemical Speciation of Dissolved Iron in the Bering Sea, Alaska |
title_sort |
physicochemical speciation of dissolved iron in the bering sea, alaska |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2007 |
url |
https://digitalcommons.usf.edu/msc_facpub/620 https://doi.org/10.4319/lo.2007.52.5.1800 |
geographic |
Bering Sea |
geographic_facet |
Bering Sea |
genre |
Bering Sea Alaska |
genre_facet |
Bering Sea Alaska |
op_source |
Marine Science Faculty Publications |
op_relation |
https://digitalcommons.usf.edu/msc_facpub/620 https://doi.org/10.4319/lo.2007.52.5.1800 |
op_doi |
https://doi.org/10.4319/lo.2007.52.5.1800 |
container_title |
Limnology and Oceanography |
container_volume |
52 |
container_issue |
5 |
container_start_page |
1800 |
op_container_end_page |
1808 |
_version_ |
1766377766600572928 |