Valk, Ole; Rutgers van der Loeff, Michiel M; Geibert, Walter (2018): Thorium isotopes in the water column at station PS94/050 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.893863, In supplement to: Valk, Ole; Rutgers van der Loeff, Michiel M; Geibert, Walter; Gdaniec, Sandra; Rijkenberg, Micha J A; Moran, S Bradley; Lepore, Kate; Edwards, Ross L; Lu, Y; Puigcorbé, Viena (2018): Importance of hydrothermal vents in scavenging removal of 230Th in the Nansen Basin. Geophysical Research Letters, 45, https://doi.org/10.1029/2018GL079829
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Further details:
Anderson, Robert F; Fleisher, Martin Q; Robinson, Laura F; Edwards, R Lawrence; Hoff, J A; Moran, S Bradley; Rutgers van der Loeff, Michiel M; Thomas, Alexander L; Roy-Barman, Matthieu; Francois, Roger (2012): GEOTRACES intercalibration of 230Th, 232Th, 231Pa, and prospects for 10Be. Limnology and Oceanography-Methods, 10(4), 179-213, https://doi.org/10.4319/lom.2012.10.179
Hansen, R G; Ring, E J (1983): The preparation and certification of uranium reference material. Council for Mineral Technology, Randburg, South Africa
Project(s):
Marine Geochemistry @ AWI (AWI_MarGeoChem)
Coverage:
Latitude: 84.398670 * Longitude: 30.715170
Date/Time Start: 2015-08-26T09:05:00 * Date/Time End: 2015-08-26T09:05:00
Minimum DEPTH, water: 50 m * Maximum DEPTH, water: 3965 m
Event(s):
PS94/050-1 * Latitude: 84.398670 * Longitude: 30.715170 * Date/Time: 2015-08-26T09:05:00 * Elevation: -4055.7 m * Location: Arctic Ocean * Campaign: PS94 (ARK-XXIX/3) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO)
Comment:
Analysis of 230Th and 232Th were performed in clean laboratories of the Alfred-Wegener-Institute (AWI), following GEOTRACES methods (Anderson et al., 2012).
Seawater samples were spiked with 229Th and 236U to prepare the isotope dilution analyses by ICP-MS. Spikes were calibrated against the reference standard material UREM11, a material in state of radioactive equilibrium (Hansen et al., 1983].
Particles were sampled using in-situ pumps (McLane and Challenger Oceanic). 208 L to 772 L seawater were pumped through a 142 mm ᴓ, 0.45 µm pore size Supor® (polyether sulfone) filter (Anderson et al., 2012). Filters were cut aboard for subsamples under a laminar flow hood on a cutting board using tweezers and scalpels. 5/6 of the filters were used for Thorium and 231Pa (not shown in this study) analysis. A subsample (23mm ᴓ) was dried, placed onto plastic mounts, covered with Mylar and aluminum foil and directly measured by beta decay counting of 234Th (t1/2 = 24.1 days) for at least 12 h. Background measurements were performed six months later. Measurements were performed using an ICP-MS (Thermo Scientific™ ELEMENT-2™) equipped with an Apex-Q (Elemental Scientific®).
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Version comment:
2020-01-28: Thorium 232, dissolved corrected
Parameter(s):
Change history:
2020-01-29T10:14:55 – Thorium 232, dissolved corrected
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
117 data points