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The stabilisation and transportation of dissolved iron from high temperature hydrothermal vent systems

The stabilisation and transportation of dissolved iron from high temperature hydrothermal vent systems
The stabilisation and transportation of dissolved iron from high temperature hydrothermal vent systems
Iron (Fe) binding phases in two hydrothermal plumes in the Southern Ocean were studied using a novel voltammetric technique. This approach, reverse titration–competitive ligand exchange–adsorptive cathodic stripping voltammetry, showed that on average 30±21% of dissolved Fe in the hydrothermal plumes was stabilised by chemically labile binding to ligands. The conditional stability constant (log K?FeL) of the observed complexes was 20.61±0.54 (mean±1 SD) for the two vent sites, intermediate between previous measurements of deep ocean ligands (21.4–23; Kondo et al., 2012) and dissolved weak estuarine ligands (<20; Gerringa et al., 2007).

Our results indicate that approximately 7.5% of all hydrothermal Fe was stabilised by complexation with ligands. Furthermore, 47±26% of the dissolved Fe in the plume existed in the colloidal size range (0.02–0.2 µm). Our data suggests that a portion (?7.5%) of hydrothermal Fe is sufficiently stabilised in the dissolved size fraction (<0.2 µm) to make an important impact on deep ocean Fe distributions. Lateral deep ocean currents transport this hydrothermal Fe as lenses of enhanced Fe concentrations away from mid ocean ridge spreading centres and back arc basins.
iron, ligand, colloid, hydrothermal plume, cle–acsv, speciation
0003-2670
280-290
Hawkes, Jeffrey A.
19e298a9-b5bf-4987-bfea-07780ca5bd69
Gledhill, Martha
da795c1e-1489-4d40-9df1-fc6bde54382d
Connelly, Douglas P.
d49131bb-af38-4768-9953-7ae0b43e33c8
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Hawkes, Jeffrey A.
19e298a9-b5bf-4987-bfea-07780ca5bd69
Gledhill, Martha
da795c1e-1489-4d40-9df1-fc6bde54382d
Connelly, Douglas P.
d49131bb-af38-4768-9953-7ae0b43e33c8
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9

Hawkes, Jeffrey A., Gledhill, Martha, Connelly, Douglas P. and Achterberg, Eric P. (2013) The stabilisation and transportation of dissolved iron from high temperature hydrothermal vent systems. Analytica Chimica Acta, 375, 280-290. (doi:10.1016/j.epsl.2013.05.047).

Record type: Article

Abstract

Iron (Fe) binding phases in two hydrothermal plumes in the Southern Ocean were studied using a novel voltammetric technique. This approach, reverse titration–competitive ligand exchange–adsorptive cathodic stripping voltammetry, showed that on average 30±21% of dissolved Fe in the hydrothermal plumes was stabilised by chemically labile binding to ligands. The conditional stability constant (log K?FeL) of the observed complexes was 20.61±0.54 (mean±1 SD) for the two vent sites, intermediate between previous measurements of deep ocean ligands (21.4–23; Kondo et al., 2012) and dissolved weak estuarine ligands (<20; Gerringa et al., 2007).

Our results indicate that approximately 7.5% of all hydrothermal Fe was stabilised by complexation with ligands. Furthermore, 47±26% of the dissolved Fe in the plume existed in the colloidal size range (0.02–0.2 µm). Our data suggests that a portion (?7.5%) of hydrothermal Fe is sufficiently stabilised in the dissolved size fraction (<0.2 µm) to make an important impact on deep ocean Fe distributions. Lateral deep ocean currents transport this hydrothermal Fe as lenses of enhanced Fe concentrations away from mid ocean ridge spreading centres and back arc basins.

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e-pub ahead of print date: 4 June 2013
Published date: 1 August 2013
Keywords: iron, ligand, colloid, hydrothermal plume, cle–acsv, speciation
Organisations: Geochemistry, Ocean Biochemistry & Ecosystems, Marine Geoscience

Identifiers

Local EPrints ID: 353653
URI: http://eprints.soton.ac.uk/id/eprint/353653
ISSN: 0003-2670
PURE UUID: 3671b7aa-5d85-4c04-b7c8-60c16a4b8b09

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Date deposited: 12 Jun 2013 14:57
Last modified: 14 Mar 2024 14:08

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Contributors

Author: Jeffrey A. Hawkes
Author: Martha Gledhill
Author: Douglas P. Connelly

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