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Kleint, Charlotte; Hawkes, Jeffrey A; Sander, Sylvia G; Koschinsky, Andrea (2016): Geochemical characterization and the voltammetric investigation of hydrothermal Iron speciation of samples gained during SONNE cruise SO229 [dataset]. PANGAEA,, Supplement to: Kleint, C et al. (2016): Voltammetric investigation of hydrothermal iron speciation. Frontiers in Marine Science, 3, 11 pp,

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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 µM dFe with only a small fraction between 1.1 and 11.8% being chemically labile. Iron binding ligand concentrations ([L]) were found in µM level with strong conditional stability constants up to logKFeL,Fe3+ 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 Felab, indicating that all available Fe is being complexed, which in combination with high Felab 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.
Median Latitude: -17.831499 * Median Longitude: 169.278667 * South-bound Latitude: -18.130670 * West-bound Longitude: 168.402830 * North-bound Latitude: -16.688830 * East-bound Longitude: 169.519170
Date/Time Start: 2013-07-09T22:02:00 * Date/Time End: 2013-07-20T07:49:00
Minimum DEPTH, water: 400 m * Maximum DEPTH, water: 1873 m
SO229-19-1 * Latitude Start: -16.689500 * Longitude Start: 168.402830 * Latitude End: -16.688830 * Longitude End: 168.404670 * Date/Time Start: 2013-07-09T22:02:00 * Date/Time End: 2013-07-10T05:12:00 * Elevation Start: -339.8 m * Elevation End: -334.0 m * Location: Coral Sea * Campaign: SO229 (VANUATU) * Basis: Sonne * Method/Device: Remote operated vehicle (ROV)
SO229-27-1 * Latitude Start: -18.128330 * Longitude Start: 169.512000 * Latitude End: -18.130670 * Longitude End: 169.518670 * Date/Time Start: 2013-07-11T22:32:00 * Date/Time End: 2013-07-12T06:08:00 * Elevation Start: -1878.0 m * Elevation End: -1875.0 m * Location: Coral Sea * Campaign: SO229 (VANUATU) * Basis: Sonne * Method/Device: Remote operated vehicle (ROV)
SO229-30-1 * Latitude: -18.129330 * Longitude: 169.517170 * Date/Time: 2013-07-12T13:24:00 * Elevation: -1872.5 m * Location: Coral Sea * Campaign: SO229 (VANUATU) * Basis: Sonne * Method/Device: CTD/Rosette (CTD-RO) * Comment: rope length max: 1810m
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventKleint, Charlotte
2Sample IDSample IDKleint, Charlotte
3Sample typeSamp typeKleint, Charlotte
4Device typeDeviceKleint, CharlotteSampling device
5Date/Time of eventDate/TimeKleint, Charlotte
6Latitude of eventLatitudeKleint, Charlotte
7Longitude of eventLongitudeKleint, Charlotte
8Elevation of eventElevationmKleint, Charlotte
9DEPTH, waterDepth watermKleint, CharlotteGeocode
10Hydrogen sulfideH2Sµmol/lKleint, Charlotte
11pHpHKleint, Charlotte
12Oxidation reduction (RedOx) potentialEhmVKleint, Charlotte
13Iron, dissolvedFe dissnmol/lKleint, Charlotte
14Manganese, dissolvedMn dissnmol/lKleint, Charlotte
15Iron-binding ligand, dissolvedFeL dissnmol/lKleint, Charlotteusing dissolved iron
16Standard deviationStd dev±Kleint, Charlotteusing dissolved iron
17Iron-binding strengthLogK FeL,Fe3+Kleint, Charlotte
18Standard deviationStd dev±Kleint, Charlotte
19Iron-binding ligand, dissolvedFeL dissnmol/lKleint, Charlotteusing chemically labile iron
20Standard deviationStd dev±Kleint, Charlotteusing chemically labile iron
21Iron-binding strengthLogK FeL,Fe3+Kleint, Charlotte
22Standard deviationStd dev±Kleint, Charlotte
23Iron, chemically labileFe labnmol/lKleint, Charlotte
24RatioRatio%Kleint, CharlotteProportional chemically labile iron
25Iron-binding ligand, excessFeL xsnmol/lKleint, Charlotte
26RatioRatio%Kleint, CharlotteProportional excess of iron-binding ligand
197 data points

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