How crucial is the impact of calcium on the reactivity of iron-organic matter aggregates? Insights from arsenic - Archive ouverte HAL Access content directly
Journal Articles Journal of Hazardous Materials Year : 2021

How crucial is the impact of calcium on the reactivity of iron-organic matter aggregates? Insights from arsenic

(1) , (2) , (3) , (1) , (1) , (2) , (2) , (1)
1
2
3
Anthony Beauvois
Delphine Vantelon
Martine Bouhnik-Le Coz
Charlotte Catrouillet
Valérie Briois
Thomas Bizien

Abstract

Environmental iron-organic matter (Fe-OM) aggregates play a major role in the dynamic of pollutants. Nowadays, there is a lack of information about the control exerted by their structural organization on their reactivity towards metal(loid)s and in particular, the impact of major ions, such as calcium. The sorption capacity of mimetic environmental Fe-OM-Ca aggregates was investigated relative to the Fe/organic carbon (OC) and Ca/Fe ratios using As as a probe. It was shown that Fe speciation is the key factor controlling the reactivity of Fe-OM-Ca aggregates regarding the high affinity of Fe(III)-oligomers towards As and the high sorption capacity of ferrihydrite-like nanoparticles. Moreover, when it occurs at high concentration, Ca competes with Fe for OM binding leading to an increase in the amount of ferrihydrite-like nanoparticles and binding site availability. As a consequence, Ca not only impacts the ionic strength but it also has a dramatic impact on the structural organization of Fe-OM aggregates at several scales of organization, resulting in an increase of their sorption capacity. In the presence of high amounts of Ca, Fe-OM-Ca aggregates could immobilize pollutants in the soil porous media as they form a micrometric network exhibiting a strong sorption capacity.
Fichier principal
Vignette du fichier
beauvois-2020.pdf (2.38 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

insu-02959672 , version 1 (07-10-2020)

Identifiers

Cite

Anthony Beauvois, Delphine Vantelon, Jacques Jestin, Martine Bouhnik-Le Coz, Charlotte Catrouillet, et al.. How crucial is the impact of calcium on the reactivity of iron-organic matter aggregates? Insights from arsenic. Journal of Hazardous Materials, 2021, 404, part A, pp.124127. ⟨10.1016/j.jhazmat.2020.124127⟩. ⟨insu-02959672⟩
166 View
114 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More