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Dissolved Fe(II) in a river-estuary system rich in dissolved organic matter

Dissolved Fe(II) in a river-estuary system rich in dissolved organic matter
Dissolved Fe(II) in a river-estuary system rich in dissolved organic matter
Reduced iron, Fe(II), accounts for a significant fraction of dissolved Fe across many natural surface waters despite its rapid oxidation under oxic conditions. Here we investigate the temporal and spatial variation in dissolved Fe redox state in a high dissolved organic matter (DOM) estuarine system, the River Beaulieu. We couple manual sample collection with the deployment of an autonomous in situ analyser, designed to simultaneously measure dissolved Fe(II) and total dissolved Fe, in order to investigate processes operating on the diurnal timescale and to evaluate the performance of the analyser in a high DOM environment.

Concentrations of dissolved Fe available to the ligand ferrozine are elevated throughout the estuary (up to 21 ?M in fresh water) and notably higher than those previously reported likely due to seasonal variation. Fe(II) is observed to account for a large, varying fraction of the dissolved Fe available to ferrozine (25.5 ± 12.5%) and this fraction decreases with increasing salinity. We demonstrate that the very high DOM concentration in this environment and association of this DOM with dissolved Fe, prevents the accurate measurement of dissolved Fe concentrations in situ using a sensor reliant on rapid competitive ligand exchange.
Iron, estuary, dissolved organic matter, Beaulieu
0272-7714
1-9
Hopwood, Mark J.
cb24a4ad-217e-4528-b11b-4dfa3d5a1e09
Statham, Peter J.
51458f15-d6e2-4231-8bba-d0567f9e440c
Milani, Ambra
839ef5af-ea55-4f7c-a5d6-5dfa4c5b62aa
Hopwood, Mark J.
cb24a4ad-217e-4528-b11b-4dfa3d5a1e09
Statham, Peter J.
51458f15-d6e2-4231-8bba-d0567f9e440c
Milani, Ambra
839ef5af-ea55-4f7c-a5d6-5dfa4c5b62aa

Hopwood, Mark J., Statham, Peter J. and Milani, Ambra (2014) Dissolved Fe(II) in a river-estuary system rich in dissolved organic matter. Estuarine, Coastal and Shelf Science, 151, 1-9. (doi:10.1016/j.ecss.2014.09.015).

Record type: Article

Abstract

Reduced iron, Fe(II), accounts for a significant fraction of dissolved Fe across many natural surface waters despite its rapid oxidation under oxic conditions. Here we investigate the temporal and spatial variation in dissolved Fe redox state in a high dissolved organic matter (DOM) estuarine system, the River Beaulieu. We couple manual sample collection with the deployment of an autonomous in situ analyser, designed to simultaneously measure dissolved Fe(II) and total dissolved Fe, in order to investigate processes operating on the diurnal timescale and to evaluate the performance of the analyser in a high DOM environment.

Concentrations of dissolved Fe available to the ligand ferrozine are elevated throughout the estuary (up to 21 ?M in fresh water) and notably higher than those previously reported likely due to seasonal variation. Fe(II) is observed to account for a large, varying fraction of the dissolved Fe available to ferrozine (25.5 ± 12.5%) and this fraction decreases with increasing salinity. We demonstrate that the very high DOM concentration in this environment and association of this DOM with dissolved Fe, prevents the accurate measurement of dissolved Fe concentrations in situ using a sensor reliant on rapid competitive ligand exchange.

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More information

Accepted/In Press date: September 2014
Published date: 5 December 2014
Keywords: Iron, estuary, dissolved organic matter, Beaulieu
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 369580
URI: http://eprints.soton.ac.uk/id/eprint/369580
ISSN: 0272-7714
PURE UUID: 03150136-b391-44d1-a21c-4b90bd071e04

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Date deposited: 01 Oct 2014 10:27
Last modified: 15 Jul 2019 21:42

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Contributors

Author: Mark J. Hopwood
Author: Ambra Milani

University divisions

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