Scholz, Florian; Zabel, Matthias; Kossack, Michael: Sequential iron extraction, pore water and solid phase analyses for sediment cores from cruises M157 and MSM105 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.972991 (dataset in review)
Abstract:
Fe2+ was analysed photometrically (Hach Lange DR 5000 photometer) at 565 nm following the method of Collins et al. (1959). 1 mL of acidified sample (20 L of 1% ascorbic acid) was added to 50 μL of a ferrospectral reagent (Merck Chemicals) in disposable polystyrene cuvettes (Stookey, 1970). Samples with high Fe2+ concentrations were diluted with oxygen-free artificial seawater. Total dissolved hydrogen sulfide (H2S) was measured photometrically using the methylene blue method in samples that were fixed on board with ZnAc (Cline, 1969). Dissolved silicon (Si4+) was determined in samples acidified by suprapure concentrated HNO3 (10 μl per ml of sample) by inductively coupled plasma optical emission spectroscopy (ICP-OES; axial plasma observation; Agilent 720) with a precision of at least 2%. Total organic carbon (TOC) was determined by using an element analyzer (Euro EA, HEKAtech). Total iron (Fe), potassium (K) and aluminium (Al) concentrations in the solid phase were determined by ICP-OES following digestion in nitric acid, hydrofluoric acid and perchloric acid. A combination of the multi-step sequential Fe extraction methods by Poulton and Canfield (2005) and Huerta-Diaz and Morse (1990) was applied to determine sedimentary Fe speciation including pyrite.
Keyword(s):
Related to:
Scholz, Florian; Zabel, Matthias; Kossack, Michael (submitted): Iron redox shuttling and uptake by silicate minerals on the Namibian mud belt.
References:
Cline, J D (1969): Spectrophotometric determination of hydrogen sulfide in natural waters. Limnology and Oceanography, 14, 454-458, https://doi.org/10.4319/lo.1969.14.3.0454
Huerta-Diaz, Miguel A; Morse, John W (1990): A quantitative method for determination of trace metal concentrations in sedimentary pyrite. Marine Chemistry, 29, 119-144, https://doi.org/10.1016/0304-4203(90)90009-2
Poulton, Simon W; Canfield, Donald E (2011): Ferruginous Conditions: A Dominant Feature of the Ocean through Earth's History. Elements, 7(2), 107-112, https://doi.org/10.2113/gselements.7.2.107
Funding:
Deutsche Forschungsgemeinschaft, Bonn (DFG), grant/award no. ICONOX: Iron Cycling in Continental Margin Sediments and the Nutrient and Oxygen Balance of the Ocean
Federal Ministry of Education and Research (BMBF), grant/award no. 03F0814B: Küstennahe Auftriebsgebiete EVAR: Variationen der Auftriebsintensität und des Sedimentationsregimes im Benguela Auftriebssystem während des Holozän und des späten Pleistozän
Federal Ministry of Education and Research (BMBF), grant/award no. 03F0814C: Küstennahe Auftriebsgebiete EVAR: In situ Erfassung und Modellierung des benthischen Stoffumsatzes
Coverage:
Median Latitude: -23.889239 * Median Longitude: 14.194501 * South-bound Latitude: -25.005883 * West-bound Longitude: 13.499050 * North-bound Latitude: -22.999530 * East-bound Longitude: 14.652667
Date/Time Start: 2019-08-21T10:37:00 * Date/Time End: 2022-02-06T23:00:32
Minimum DEPTH, sediment/rock: 0.000 m * Maximum DEPTH, sediment/rock: 0.420 m
Event(s):
M157_10-8 * Latitude: -22.999917 * Longitude: 13.500167 * Date/Time: 2019-08-25T10:01:00 * Elevation: -241.0 m * Campaign: M157 (BUSUC 1) * Basis: Meteor (1986) * Method/Device: MultiCorer (MUC)
M157_12-7 * Latitude: -22.999917 * Longitude: 13.866567 * Date/Time: 2019-08-21T10:37:00 * Elevation: -150.0 m * Campaign: M157 (BUSUC 1) * Basis: Meteor (1986) * Method/Device: MultiCorer (MUC)
M157_14-17 * Latitude: -22.999817 * Longitude: 14.050183 * Date/Time: 2019-08-28T15:25:00 * Elevation: -139.0 m * Campaign: M157 (BUSUC 1) * Basis: Meteor (1986) * Method/Device: MultiCorer (MUC)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Kossack, Michael | |||
| 2 | Latitude of event | Latitude | Kossack, Michael | |||
| 3 | Longitude of event | Longitude | Kossack, Michael | |||
| 4 | Elevation of event | Elevation | m | Kossack, Michael | ||
| 5 | DEPTH, sediment/rock | Depth sed | m | Kossack, Michael | Geocode | |
| 6 | Iron | Fe | µmol/l | Kossack, Michael | Photometer, Hach Lange DR 5000 | |
| 7 | Hydrogen sulfide | H2S | mmol/l | Kossack, Michael | Photometer, methylene blue (Cline, 1969) | |
| 8 | Silicon | Si | µmol/l | Kossack, Michael | ICP-OES (Agilent 720) | |
| 9 | Carbon, organic, total | TOC | % | Kossack, Michael | Elemental analyzer, HEKAtechGmbH, Euro EA | |
| 10 | Aluminium | Al | mg/g | Kossack, Michael | ICP-OES (Agilent 720) | |
| 11 | Iron | Fe | mg/g | Kossack, Michael | ICP-OES (Agilent 720) | |
| 12 | Potassium | K | mg/g | Kossack, Michael | ICP-OES (Agilent 720) | |
| 13 | Aluminium | Al | % | Kossack, Michael | ICP-OES, VARIAN 720-ES | hydrochloric acid, wt% |
| 14 | Aluminium | Al | % | Kossack, Michael | ICP-OES, VARIAN 720-ES | dithionite solution, wt% |
| 15 | Aluminium | Al | % | Kossack, Michael | ICP-OES, VARIAN 720-ES | oxalic acid, wt% |
| 16 | Aluminium | Al | % | Kossack, Michael | ICP-OES, VARIAN 720-ES | hydrofluoric acid, wt% |
| 17 | Aluminium | Al | % | Kossack, Michael | ICP-OES, VARIAN 720-ES | nitric acid, wt% |
| 18 | Iron | Fe | % | Kossack, Michael | ICP-OES, VARIAN 720-ES | hydrochloric acid, wt% |
| 19 | Iron | Fe | % | Kossack, Michael | ICP-OES, VARIAN 720-ES | dithionite solution, wt% |
| 20 | Iron | Fe | % | Kossack, Michael | ICP-OES, VARIAN 720-ES | oxalic acid, wt% |
| 21 | Iron | Fe | % | Kossack, Michael | ICP-OES, VARIAN 720-ES | hydrofluoric acid, wt% |
| 22 | Iron | Fe | % | Kossack, Michael | ICP-OES, VARIAN 720-ES | nitric acid, wt% |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1780 data points