Thorium isotopes in the water column at station PS94/050

DOI

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®).===============Version comment:2020-01-28: Thorium 232, dissolved corrected

Identifier
DOI https://doi.org/10.1594/PANGAEA.893863
Related Identifier https://doi.org/10.1594/PANGAEA.893871
Related Identifier https://doi.org/10.1029/2018GL079829
Related Identifier https://doi.org/10.4319/lom.2012.10.179
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.893863
Provenance
Creator Valk, Ole ORCID logo; Rutgers van der Loeff, Michiel M ORCID logo; Geibert, Walter ORCID logo
Publisher PANGAEA
Publication Year 2018
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Language English
Resource Type Dataset
Format text/tab-separated-values
Size 117 data points
Discipline Earth System Research
Spatial Coverage (30.715 LON, 84.399 LAT); Arctic Ocean