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Voltammetric Investigation of Hydrothermal Iron Speciation
Jacobs Univ Bremen, Sch Engn & Sci, Dept Phys & Earth Sci, Bremen, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Analytical Chemistry.ORCID iD: 0000-0003-0664-2242
Univ Otago, NIWA Univ Otago Res Ctr Oceanog, Marine & Freshwater Chem, Dept Chem, Dunedin, New Zealand.
Jacobs Univ Bremen, Sch Engn & Sci, Dept Phys & Earth Sci, Bremen, Germany.
2016 (English)In: Frontiers in Marine Science, E-ISSN 2296-7745, Vol. 3, article id 75Article in journal (Refereed) Published
Abstract [en]

Hydrothermal vent fluids are highly enriched in iron (Fe) compared to ambient seawater, and organic ligands may play a role in facilitating the transport of some hydrothermal Fe into the open ocean. This is important since Fe is a limiting micronutrient for primary production in large parts of the world's surface ocean. We have investigated the concentration and speciation of Fe in several vent fluid and plume samples from the Nifonea vent field, Coriolis Troughs, New Hebrides Island Arc, South Pacific Ocean using competitive ligand exchange-adsorptive cathodic stripping voltammetry (CLE-AdCSV) with salicylaldoxime (SA) as the artificial ligand. Our results for total dissolved Fe (dFe) in the buoyant hydrothermal plume samples showed concentrations up to 3.86 mu M dFe with only a small fraction between 1.1 and 11.8% being chemically labile. Iron binding ligand concentrations (M) were found in mu M level with strong conditional stability constants up to logK(FeL,Fe)(3+) of 22.9. Within the non-buoyant hydrothermal plume above the Nifonea vent field, up to 84.7% of the available Fe is chemically labile and [L] concentrations up to 97 nM were measured. [L] was consistently in excess of Fe-lab, indicating that all available Fe is being complexed, which in combination with high F-lab values in the non-buoyant plume, signifies that a high fraction of hydrothermal dFe is potentially being transported away from the plume into the surrounding waters, contributing to the global oceanic Fe budget.

Place, publisher, year, edition, pages
FRONTIERS MEDIA SA , 2016. Vol. 3, article id 75
Keywords [en]
iron, CLE-AdCSV, hydrothermal vents, organic complexation, Vanuatu, New Hebrides Island Arc, Nifonea vent field
National Category
Oceanography, Hydrology and Water Resources
Identifiers
URN: urn:nbn:se:uu:diva-400173DOI: 10.3389/fmars.2016.00075ISI: 000457358000074OAI: oai:DiVA.org:uu-400173DiVA, id: diva2:1380507
Available from: 2019-12-19 Created: 2019-12-19 Last updated: 2019-12-19Bibliographically approved

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