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Title: Organic matter effect on Fe(II) oxidation kinetics in the Labrador Sea
Authors: Santana-González, Carolina 
González-Dávila, Melchor 
Santana-Casiano, J. Magdalena 
Gladyshev, Sergey
Sokov, Alexey
UNESCO Clasification: 2503 Geoquímica
Keywords: Natural-Waters
Iron Concentrations
Nanomolar Levels, et al
Issue Date: 2019
Journal: Chemical geology 
Abstract: The Fe(II) oxidation rate was studied in one latitudinal and one longitudinal transect crossing the Labrador Sea. The studies considered the temperature, pH, salinity and total organic carbon (TOC) content. The pseudo-first-order kinetic rate, k' (min(-1)), variability was controlled by temperature (77%) when recreating in situ conditions, by pH(F) (75%) at a fixed temperature of 15 degrees C and by salinity and TOC (80%) when samples were fixed in both temperature and pH(F) 8. Sources and characteristics of TOC affected the oxidation of Fe(II). Organic matter produced positive and negative effects on the Fe(II) oxidation rate. A theoretical approach that considers the effect of inorganic interactions and temperature on oxidation kinetics was included to explain the effects of organic ligands on the Fe(II) oxidation rate. An empirical equation for the calculation of Fe(II) oxidation rate constants was obtained, considering the in situ conditions of temperature, pH(F) and salinity for the North Atlantic.This article is part of a special issue entitled: "Cycles of trace elements and isotopes in the ocean - GEOTRACES and beyond" - edited by Tim M. Conway, Tristan Horner, Yves Plancherel, and Aridane G. Gonzalez.
ISSN: 0009-2541
DOI: 10.1016/j.chemgeo.2018.12.019
Source: Chemical Geology [ISSN 0009-2541], v. 511, p. 238-255, (Abril 2019)
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