Pseudo-first order oxidation rate, apparent oxidation rate and half-life time of Fe(II) under different pH conditions for seawater enriched with nutrients (SWEN) and seawater enriched organic exudates (SWEX) ...

• Main Authors: Samperio-Ramos, Guillermo, Santana-Casiano, Juana Magdalena, González-Dávila, Melchor
• Format: Dataset
• Language: English
• Published: PANGAEA 2018
• Subjects: Bottles or small containers/Aquaria <20 L; Chromista; Emiliania huxleyi; Haptophyta; Laboratory experiment; Laboratory strains; Macro-nutrients; Not applicable; Other; Other metabolic rates; Pelagos; Phytoplankton; Single species; Type; Species; Registration number of species; Uniform resource locator/link to reference; Treatment; pH; Carbon, organic, dissolved; Carbon, organic, dissolved, standard error; Uronic acids, dissolved; Uronic acids, dissolved, standard error; Pseudo-first order oxidation rate; Pseudo-first order oxidation rate, standard error; Oxygen; Oxygen, standard error; Apparent oxidation rate; Apparent oxidation rate, standard error; Half-life time; Temperature, water; Salinity; Alkalinity, total; Alkalinity, total, standard error; Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard error; Partial pressure of carbon dioxide water at sea surface temperature wet air; Partial pressure of carbon dioxide water at sea surface temperature wet air, standard error; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Aragonite saturation state; Calcite saturation state; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; Dua; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.924610; https://doi.pangaea.de/10.1594/PANGAEA.924610

The potential effect of ocean acidification on the exudation of organic matter by phytoplankton and, consequently, on the iron redox chemistry is largely unknown. In this study, the coccolithophorid Emiliania huxleyi was exposed to different pCO2 conditions (225–900 μatm), in order to determine the role of natural organic ligands on the Fe(II) oxidation rate. Oxidation kinetics of Fe(II) were studied as a function of pH (7.75–8.25) and dissolved organic carbon levels produced (0–141.11 μmol C/L) during the different growth stages. The Fe(II) oxidation rate always decreased in the presence of exudates as compared to that in the exudates-free seawater. The organic ligands present in the coccolithophorid exudates were responsible for this decrease. The oxidation of Fe(II) in artificial seawater was also investigated at nanomolar levels over a range of pH (7.75–8.25) at 25°C in the presence of different glucuronic acid concentrations. Dissolved uronic acids (DUA) slightly increased the experimental rate compared ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2016) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2018-05-23. ...