Organic matter effect on Fe(II) oxidation kinetics in the Labrador Sea

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 tempera...

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Bibliographic Details
Published in:Chemical Geology
Main Authors: Santana-González, Carolina, González-Dávila, Melchor, Santana-Casiano, J. Magdalena, Gladyshev, Sergey, Sokov, Alexey
Other Authors: 57193317400, 6603931257, 6701344294, 7003444062, 6701757896, 13063007, 30362855, 4779462, 1015500, 3541534, WOS:Santana-Gonzalez, C, WOS:Gonzalez-Davila, M, WOS:Santana-Casiano, JM, WOS:Gladyshev, S, WOS:Sokov, A
Format: Article in Journal/Newspaper
Language:English
Published: 2019
Subjects:
2503 Geoquímica
Natural-Waters
North-Atlantic
Phaeodactylum-Tricornutum
Iron Concentrations
Nanomolar Levels
Flow-Injection
Fulvic-Acid
Seawater
Deep
Complexation
Fe(Ii)
Oxidation Kinetics
Labrador Sea
Organic Ligands
Conway
Gonzalez
Tristan
North Atlantic
Online Access:http://hdl.handle.net/10553/55070
https://doi.org/10.1016/j.chemgeo.2018.12.019
Description
Summary: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. 255 238 18

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