Gerringa, Loes J A; Rijkenberg, Micha J A; Slagter, Hans A (2018): Dissolved iron measured on board with Flow injection analysis and iron-binding dissolved organic ligands from Ultra Clean CTD collected depth profiles during GEOTRACES PS94 Arctic cruise on Polarstern [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.890975
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Abstract:
Data from Polarstern cruise PS94 in the Arctic in 2015 with chief scientist Ursula Schauer. In order to explain geochemical cycles of Fe in the ocean, M. Rijkenberg, L. Gerringa and H. Slagter a.o. sampled filtered seawater using an ultra clean titanium CTD. In these samples on board measurements were executed: dissolved Fe by flow injection analysis and the characteristics of the dissolved organic Fe-binding organic ligands (totalL); characteristics being the concentration of these ligands and the conditional binding constant of the Fe-complex (K' expressed as its logarithm: logK). Moreover in order to relate the dissolved organic Fe-binding organic ligands to humic substances, fluorescence of dissolved organic matter was measured as well as humic substances using voltammetry.
Related to:
Rijkenberg, Micha J A; Slagter, Hans A; Rutgers van der Loeff, Michiel M; van Ooijen, Jan C; Gerringa, Loes J A (2018): Dissolved Fe in the Deep and Upper Arctic Ocean With a Focus on Fe Limitation in the Nansen Basin. Frontiers in Marine Science, 5, https://doi.org/10.3389/fmars.2018.00088
Slagter, Hans A; Reader, Heather E; Rijkenberg, Micha J A; Rutgers van der Loeff, Michiel M; de Baar, Hein J W; Gerringa, Loes J A (2017): Organic Fe speciation in the Eurasian Basins of the Arctic Ocean and its relation to terrestrial DOM. Marine Chemistry, 197, 11-25, https://doi.org/10.1016/j.marchem.2017.10.005
Further details:
Croot, Peter L; Johansson, M (2000): Determination of Iron Speciation by Cathodic Stripping Voltammetry in Seawater Using the Competing Ligand 2‐(2‐Thiazolylazo)‐p‐cresol (TAC). Electroanalysis, 12 (8), 565-576, https://doi.org/10.1002/(SICI)1521-4109(200005)12:8%3C565::AID-ELAN565%3E3.0.CO;2-L
Gerringa, Loes J A; Rijkenberg, Micha J A; Thuróczy, Charles-Edouard; Maas, Leo R M (2014): A critical look at the calculation of the binding characteristics and concentration of iron complexing ligands in seawater with suggested improvements. Environmental Chemistry, 11(2), 114, https://doi.org/10.1071/EN13072
Laglera, Luis Miguel; Battaglia, Gianluca; Van den Berg, Johnnie; van den Berg, Constant M G (2007): Determination of humic substances in natural waters by cathodic stripping voltammetry of their complexes with iron. Analytica Chimica Acta, 599(1), 58-66, https://doi.org/10.1016/j.aca.2007.07.059
Rijkenberg, Micha J A; de Baar, Hein J W; Bakker, Karel; Gerringa, Loes J A; Keijzer, Edwin; Laan, Martin; Laan, Patrick; Middag, Rob; Ober, Sven; van Ooijen, Jan C; Ossebaar, Sharyn; van Weerlee, Evaline; Smit, Marck G (2015): “PRISTINE”, a new high volume sampler for ultraclean sampling of trace metals and isotopes. Marine Chemistry, 177, 501-509, https://doi.org/10.1016/j.marchem.2015.07.001
Project(s):
Coverage:
Median Latitude: 82.572315 * Median Longitude: 90.951644 * South-bound Latitude: 70.999330 * West-bound Longitude: 21.192830 * North-bound Latitude: 89.930170 * East-bound Longitude: -116.679830
Date/Time Start: 2015-08-20T01:23:00 * Date/Time End: 2015-10-09T04:27:00
Minimum DEPTH, water: 2.5 m * Maximum DEPTH, water: 4230.3 m
Event(s):
PS94/004-2 * Latitude: 79.253330 * Longitude: 30.046170 * Date/Time: 2015-08-20T01:23:00 * Elevation: -228.2 m * Location: Barents Sea * Campaign: PS94 (ARK-XXIX/3) * Basis: Polarstern * Method/Device: CTD/Rosette, ultra clean (CTD-UC)
PS94/032-4 * Latitude: 81.854000 * Longitude: 30.893330 * Date/Time: 2015-08-22T14:35:00 * Elevation: -3169.0 m * Location: Arctic Ocean * Campaign: PS94 (ARK-XXIX/3) * Basis: Polarstern * Method/Device: CTD/Rosette, ultra clean (CTD-UC)
PS94/040-2 * Latitude: 82.707000 * Longitude: 30.829830 * Date/Time: 2015-08-24T05:25:00 * Elevation: -3695.2 m * Location: Arctic Ocean * Campaign: PS94 (ARK-XXIX/3) * Basis: Polarstern * Method/Device: CTD/Rosette, ultra clean (CTD-UC)
Comment:
Sampling of sea water was performed using the ultraclean CTD (Rijkenberg et al, 2015).
Samples for dissolved metals were acidified to a pH of 1.8 using a final concentration of 0.024M ultraclean Seastar Base-line HCl (Seastar Chemicals). DFe was measured on board using flow injection analysis (FIA) based on luminol chemiluminescence (described in Rijkenberg et al., 2018). The analytical blank was on average 0.007 ± 0.004 nM DFe (n = 32) and the average detection limit (defined as 3 s of the blank pre-concentrated for 5 s) was 0.012 ± 0.007 nM DFe (n = 32).
SAFe and GEOTRACES reference materials were used.
K and total ligand concentrations have been calculated after Gerringa et al. (2014) using lDFe, except for stations 101, 119, 153, 161 and 173, here DFe is used.
Humid substances were determined according to Laglera et al. (2007).
Parameter(s):
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5486 data points
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