Dissolved copper and copper-binding organic ligands in deep-sea pore waters of the central equatorial Pacific Ocean


This data set presents dissolved copper (dCu) and copper-binding ligand (L) data for deep-sea pore waters in the Peru Basin, south east equatorial Pacific Ocean and the Clarion Clipperton Zone (CCZ) in the central equatorial Pacific Ocean. Samples were taken during cruises SO242, SO262, and SO268 using rhizons with a pore size of 0.12-0.18 µm. Several depths from one multicorer liner were pooled to get sufficient sample volume. dCu was determined by either ICP-MS analysis in kinetic energy discrimination mode or by competitive ligand equilibration–adsorptive stripping voltammetry (CLE-AdCSV). Cu speciation in the samples was also determined with CLE-AdCSV using salicylaldoxime (SA) as the added ligand. For each titration, the concentration of complexing ligands ([L]) and corresponding conditional stability constants (logK) were determined using the fitting software named ProMCC. The free copper ion (Cu2+) and bioavailable Cu' (Cu2+ + inorganic copper) were also calculated. Data was fitted using both the one-ligand and two-ligand complete complexation-fitting model. The model with the best fit and thus the least fitting error was used for data interpretation - this was always the one-ligand model. Side reaction coefficients and stability constants of SA of each sample were provided by van den Berg's ion-pairing model for seawater (EXCEL worksheet - ion-pairing model for seawater, written by C.M.G. van den Berg in 2014) using sample specific salinity values measured in the lab, a SA concentration of 5 µM, an ambient temperature of 21˚C, and a pH of 8.1.

DOI https://doi.org/10.1594/PANGAEA.929937
Related Identifier https://doi.org/10.1594/PANGAEA.932940
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.929937
Creator Paul, Sophie Anna Luise ORCID logo; Zitoun, Rebecca ORCID logo; Noowong, Ann; Manirajah, Mythili; Koschinsky, Andrea ORCID logo; Schmidt, Katja ORCID logo
Publisher PANGAEA
Publication Year 2021
Rights Creative Commons Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Resource Type Dataset
Format text/tab-separated-values
Size 261 data points
Discipline Earth System Research
Spatial Coverage (-125.925W, -7.125S, -88.451E, 14.135N); South Pacific Ocean, Peru Basin; North Pacific Ocean; Clarion-Clipperton Fraction Zone, North East Pacific Ocean
Temporal Coverage Begin 2015-09-01T17:05:53Z
Temporal Coverage End 2019-05-11T11:18:07Z