Sequential iron extraction, pore water and solid phase analyses for sediment cores from cruises M157 and MSM105
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2025
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| _version_ | 1867170127394373632 |
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| author | Scholz, Florian Zabel, Matthias Kossack, Michael |
| author_facet | Scholz, Florian Zabel, Matthias Kossack, Michael |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_972991 |
| institution | PANGAEA |
| language | en |
| publishDate | 2025 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Sequential iron extraction, pore water and solid phase analyses for sediment cores from cruises M157 and MSM105 Scholz, Florian Zabel, Matthias Kossack, Michael Aluminium; Benguela Upwelling System; BUSUC 1; BUSUC II; Carbon, organic, total; DEPTH, sediment/rock; Elemental analyzer, HEKAtechGmbH, Euro EA; Elevation of event; EVAR; Event label; GeoB23814-17; GeoB23817-13; Hydrogen sulfide; ICP-OES, VARIAN 720-ES; ICP-OES (Agilent 720); Iron; Iron Geochemistry; Latitude of event; Longitude of event; M157; M157_10-8; M157_12-7; M157_14-17; M157_16-13; M157_17-13; M157_41-3; M157_43-11; M157_44-8; M157_48-5; Maria S. Merian; Meteor (1986); MSM105; MSM105_108-2; MSM105_110-3; MSM105_13-4; MSM105_15-9; MSM105_17-12; MSM105_23-7; MSM105_24-4; MSM105_54-9; MSM105_74-6; MUC; MultiCorer; Photometer, Hach Lange DR 5000; Photometer, methylene blue (Cline, 1969); pore water; Potassium; Sediment; sequential iron extractions; Silicon; South Atlantic Ocean; The Benguela Upwelling System under climate change – Effects of VARiability in physical forcing on carbon and oxygen budgets 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. |
| title | Sequential iron extraction, pore water and solid phase analyses for sediment cores from cruises M157 and MSM105 |
| topic | Aluminium; Benguela Upwelling System; BUSUC 1; BUSUC II; Carbon, organic, total; DEPTH, sediment/rock; Elemental analyzer, HEKAtechGmbH, Euro EA; Elevation of event; EVAR; Event label; GeoB23814-17; GeoB23817-13; Hydrogen sulfide; ICP-OES, VARIAN 720-ES; ICP-OES (Agilent 720); Iron; Iron Geochemistry; Latitude of event; Longitude of event; M157; M157_10-8; M157_12-7; M157_14-17; M157_16-13; M157_17-13; M157_41-3; M157_43-11; M157_44-8; M157_48-5; Maria S. Merian; Meteor (1986); MSM105; MSM105_108-2; MSM105_110-3; MSM105_13-4; MSM105_15-9; MSM105_17-12; MSM105_23-7; MSM105_24-4; MSM105_54-9; MSM105_74-6; MUC; MultiCorer; Photometer, Hach Lange DR 5000; Photometer, methylene blue (Cline, 1969); pore water; Potassium; Sediment; sequential iron extractions; Silicon; South Atlantic Ocean; The Benguela Upwelling System under climate change – Effects of VARiability in physical forcing on carbon and oxygen budgets |
| url | https://doi.org/10.1594/PANGAEA.972991 |