An intercomparison of dissolved iron speciation at the Bermuda Atlantic Time-series Study (BATS) site: Results from GEOTRACES Crossover Station A
The organic complexation of dissolved iron (Fe) was determined in depth profile samples collected from GEOTRACES Crossover Station A, the Bermuda Atlantic Time-series Study (BATS) site, as part of the Dutch and U.S. GEOTRACES North Atlantic programs in June 2010 and November 2011, respectively. The...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2016-12-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | http://journal.frontiersin.org/Journal/10.3389/fmars.2016.00262/full |
| _version_ | 1818193900000509952 |
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| author | Kristen Nicolle Buck Loes J.A. Gerringa Micha J.A. Rijkenberg |
| author_facet | Kristen Nicolle Buck Loes J.A. Gerringa Micha J.A. Rijkenberg |
| author_sort | Kristen Nicolle Buck |
| collection | DOAJ |
| description | The organic complexation of dissolved iron (Fe) was determined in depth profile samples collected from GEOTRACES Crossover Station A, the Bermuda Atlantic Time-series Study (BATS) site, as part of the Dutch and U.S. GEOTRACES North Atlantic programs in June 2010 and November 2011, respectively. The two groups employed distinct competitive ligand exchange-adsorptive cathodic stripping voltammetry (CLE-AdCSV) methods, and resulting ligand concentrations and conditional stability constants from each profile were compared. Excellent agreement was found between the total ligand concentrations determined in June 2010 and the strongest, L1-type, ligand concentrations determined in November 2011. Yet a primary distinction between the datasets was the number of ligand classes observed: a single ligand class was characterized in the June 2010 profile while two ligand classes were observed in the November 2011 profile. To assess the role of differing interpretation approaches in determining final results, analysts exchanged titration data and accompanying parameters from the profiles for reinterpretation. The reinterpretation exercises highlighted the considerable influence of the sensitivity (S) parameter applied on interpretation results, consistent with recent intercalibration work on interpretation of copper speciation titrations. The potential role of titration data structure, humic-type substances, differing dissolved Fe concentrations, and seasonality are also discussed as possible drivers of the one versus two ligand class determinations between the two profiles, leading to recommendations for future studies of Fe-binding ligand cycling in the oceans. |
| first_indexed | 2024-12-12T00:53:44Z |
| format | Article |
| id | doaj.art-0aa038cd637e48c981f7867515ed2d94 |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-12-12T00:53:44Z |
| publishDate | 2016-12-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-0aa038cd637e48c981f7867515ed2d942022-12-22T00:43:56ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452016-12-01310.3389/fmars.2016.00262222913An intercomparison of dissolved iron speciation at the Bermuda Atlantic Time-series Study (BATS) site: Results from GEOTRACES Crossover Station AKristen Nicolle Buck0Loes J.A. Gerringa1Micha J.A. Rijkenberg2University of South FloridaUtrecht UniversityUtrecht UniversityThe organic complexation of dissolved iron (Fe) was determined in depth profile samples collected from GEOTRACES Crossover Station A, the Bermuda Atlantic Time-series Study (BATS) site, as part of the Dutch and U.S. GEOTRACES North Atlantic programs in June 2010 and November 2011, respectively. The two groups employed distinct competitive ligand exchange-adsorptive cathodic stripping voltammetry (CLE-AdCSV) methods, and resulting ligand concentrations and conditional stability constants from each profile were compared. Excellent agreement was found between the total ligand concentrations determined in June 2010 and the strongest, L1-type, ligand concentrations determined in November 2011. Yet a primary distinction between the datasets was the number of ligand classes observed: a single ligand class was characterized in the June 2010 profile while two ligand classes were observed in the November 2011 profile. To assess the role of differing interpretation approaches in determining final results, analysts exchanged titration data and accompanying parameters from the profiles for reinterpretation. The reinterpretation exercises highlighted the considerable influence of the sensitivity (S) parameter applied on interpretation results, consistent with recent intercalibration work on interpretation of copper speciation titrations. The potential role of titration data structure, humic-type substances, differing dissolved Fe concentrations, and seasonality are also discussed as possible drivers of the one versus two ligand class determinations between the two profiles, leading to recommendations for future studies of Fe-binding ligand cycling in the oceans.http://journal.frontiersin.org/Journal/10.3389/fmars.2016.00262/fullSeawaterVoltammetrychemical speciationMethod intercomparisonIron-binding ligands |
| spellingShingle | Kristen Nicolle Buck Loes J.A. Gerringa Micha J.A. Rijkenberg An intercomparison of dissolved iron speciation at the Bermuda Atlantic Time-series Study (BATS) site: Results from GEOTRACES Crossover Station A Frontiers in Marine Science Seawater Voltammetry chemical speciation Method intercomparison Iron-binding ligands |
| title | An intercomparison of dissolved iron speciation at the Bermuda Atlantic Time-series Study (BATS) site: Results from GEOTRACES Crossover Station A |
| title_full | An intercomparison of dissolved iron speciation at the Bermuda Atlantic Time-series Study (BATS) site: Results from GEOTRACES Crossover Station A |
| title_fullStr | An intercomparison of dissolved iron speciation at the Bermuda Atlantic Time-series Study (BATS) site: Results from GEOTRACES Crossover Station A |
| title_full_unstemmed | An intercomparison of dissolved iron speciation at the Bermuda Atlantic Time-series Study (BATS) site: Results from GEOTRACES Crossover Station A |
| title_short | An intercomparison of dissolved iron speciation at the Bermuda Atlantic Time-series Study (BATS) site: Results from GEOTRACES Crossover Station A |
| title_sort | intercomparison of dissolved iron speciation at the bermuda atlantic time series study bats site results from geotraces crossover station a |
| topic | Seawater Voltammetry chemical speciation Method intercomparison Iron-binding ligands |
| url | http://journal.frontiersin.org/Journal/10.3389/fmars.2016.00262/full |
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