Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/114216
Title: Influence of strong iron-binding ligands on cloud water oxidant capacity
Authors: González González, Aridane 
Bianco, Angelica
Boutorh, Julia
Cheize, Marie
Mailhot, Gilles
Delort, Anne-Marie
Planquette, Hélène
Chaumerliac, Nadine
Deguillaume, Laurent
Sarthou, Geraldine
UNESCO Clasification: 251010 Procesos litorales o sublitorales
Keywords: Cloud oxidant capacity
Iron complexation
Cloud chemistry modelling
Cloud microbiota
Issue Date: 2022
Project: BIOCAP ANR-13-BS06-0004
Journal: Science of the Total Environment 
Abstract: Iron (Fe) plays a dual role in atmospheric chemistry: it is involved in chemical and photochemical reactivity and serves as a micronutrient for microorganisms that have recently been shown to produce strong organic ligands. These ligands control the reactivity, mobility, solubility and speciation of Fe, which have a potential impact on Fe bioavailability and cloud water oxidant capacity. In this work, the concentrations of Fe-binding ligands and the conditional stability constants were experimentally measured for the first time by Competitive Ligand Exchange-Adsorptive Cathodic Stripping Voltammetry (CLE-ACSV) technique in cloud water samples collected at puy de Dôme (France). The conditional stability constants, which indicate the strength of the Fe-ligand complexes, are higher than those considered until now in cloud chemistry (mainly Fe-oxalate). To understand the effect of Fe complexation on cloud water reactivity, we used the CLEPS cloud chemistry model. According to the model results, we found that Fe complexation impacts the hydroxyl radical formation rate: contrary to our expectations, Fe complexation by natural organic ligands led to an increase in hydroxyl radical production. These findings have important impacts on cloud chemistry and the global iron cycle.
URI: http://hdl.handle.net/10553/114216
ISSN: 0048-9697
DOI: 10.1016/j.scitotenv.2022.154642
Source: Science of the Total Environment [ISSN 0048-9697], v. 829, (Julio 2022)
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