Does As(III) interact with Fe(II), Fe(III) and organic matter through ternary complexes?

Catrouillet, Charlotte; Davranche, Mélanie; Dia, Aline; Coz, Martine Bouhnik‐Le; Demangeat, Edwige; Gruau, Gérard

doi:10.1016/j.jcis.2016.02.047

Cited by 40 publications

(10 citation statements)

References 46 publications

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“…like Nps were not formed, As adsorption could occur through the Fe(III)-oligomers. This assumption was in agreement with previous results demonstrating that As binding by Fe(III) monomers or tetramers may have occured occur, leading to the formation of As-Fe-OM ternary complexes[48][49][50]. Thus, the adsorption capacity of Fe(III)-oligomers can thus be estimated as q max ~250 µmol g -1 with a Langmuir K ads value of ~20×10 -3 L µmol -1 .…”

supporting

confidence: 91%

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

Beauvois

Vantelon

Jestin

et al. 2021

Journal of Hazardous Materials

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supporting

confidence: 91%

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

Beauvois

Vantelon

Jestin

et al. 2021

Journal of Hazardous Materials

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“…In the environment, cryptic cycling of Fe could also greatly influence other biogeochemical cycles (61), such as cycling of Mn species and As species which cooccur with Fe in many anoxic environments (62,63). The cryptic cycling of Fe may also influence the transport of toxic metals in the form of Fe-OM-metal complexes, as the Fe(III)-/ Fe(II)-OM complexes may have different binding capacities and binding mechanisms to heavy metals (64,65). The reoxidation of Fe(II)-OM by phototrophic Fe(II)-oxidizing bacteria could not only increase the extent of Fe(III) photochemical reduction but also result in a larger extent of photolysis of OM and generation of labile OM for the growth of heterotrophic bacteria (Fig.…”

Section: Discussionmentioning

confidence: 99%

Cryptic Cycling of Complexes Containing Fe(III) and Organic Matter by Phototrophic Fe(II)-Oxidizing Bacteria

Peng

Bryce

Sundman

et al. 2019

Appl Environ Microbiol

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Fe-organic matter (Fe-OM) complexes are abundant in the environment and, due to their mobility, reactivity, and bioavailability, play a significant role in the biogeochemical Fe cycle. In photic zones of aquatic environments, Fe-OM complexes can potentially be reduced and oxidized, and thus cycled, by light-dependent processes, including abiotic photoreduction of Fe(III)-OM complexes and microbial oxidation of Fe(II)-OM complexes, by anoxygenic phototrophic bacteria. This could lead to a cryptic iron cycle in which continuous oxidation and rereduction of Fe could result in a low and steady-state Fe(II) concentration despite rapid Fe turnover. However, the coupling of these processes has never been demonstrated experimentally. In this study, we grew a model anoxygenic phototrophic Fe(II) oxidizer,Rhodobacter ferrooxidansSW2, with either citrate, Fe(II)-citrate, or Fe(III)-citrate. We found that strain SW2 was capable of reoxidizing Fe(II)-citrate produced by photochemical reduction of Fe(III)-citrate, which kept the dissolved Fe(II)-citrate concentration at low (<10 μM) and stable concentrations, with a concomitant increase in cell numbers. Cell suspension incubations with strain SW2 showed that it can also oxidize Fe(II)-EDTA, Fe(II)-humic acid, and Fe(II)-fulvic acid complexes. This work demonstrates the potential for active cryptic Fe cycling in the photic zone of anoxic aquatic environments, despite low measurable Fe(II) concentrations which are controlled by the rate of microbial Fe(II) oxidation and the identity of the Fe-OM complexes.IMPORTANCEIron cycling, including reduction of Fe(III) and oxidation of Fe(II), involves the formation, transformation, and dissolution of minerals and dissolved iron-organic matter compounds. It has been shown previously that Fe can be cycled so rapidly that no measurable changes in Fe(II) and Fe(III) concentrations occur, leading to a so-called cryptic cycle. Cryptic Fe cycles have been shown to be driven either abiotically by a combination of photochemical reduction of Fe(III)-OM complexes and reoxidation of Fe(II) by O2, or microbially by a combination of Fe(III)-reducing and Fe(II)-oxidizing bacteria. Our study demonstrates a new type of light-driven cryptic Fe cycle that is relevant for the photic zone of aquatic habitats involving abiotic photochemical reduction of Fe(III)-OM complexes and microbial phototrophic Fe(II) oxidation. This new type of cryptic Fe cycle has important implications for biogeochemical cycling of iron, carbon, nutrients, and heavy metals and can also influence the composition and activity of microbial communities.

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“…1 and 2 show that the addition of 10 μM of each NOM under UVA and UVB irradiation inhibited the oxidation of As(III) to varying degrees. The main reason for this observation is thought to be competitive complexation (Catrouillet et al, 2016).…”

Section: Photochemical Oxidation Of As(iii) In the Presence Of Fe(iii) And Various Nommentioning

confidence: 99%

Iron(III)-induced photooxidation of arsenite in the presence of carboxylic acids and phenols as model compounds of natural organic matter

Huang

Peng

et al. 2021

Chemosphere

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Iron species have essential influence on the environmental/geochemical behaviors of arsenic species in water and soil. Colloidal ferric hydroxide (CFH) induces photooxidation of arsenite (As(III)) to arsenate (As(V)) in water at neutral pH through surface complexation and ligand-to-metal charge transfer (LMCT). However, the effect of the co-existing natural organic matter (NOM) on the complexation-photolysis in this process has remained unclear. In the present work, the photooxidation of As(III) induced by CFH was investigated in the presence of various carboxylic acids and polyphenols as simple model compounds of NOM. Two different light sources of ultraviolet A (UVA) (λ max = 365 nm) and ultraviolet B (UVB) (λ max = 313 nm) were used for photooxidation treatment of the experimental ternary system and the control binary system respectively. The obtained results demonstrated that all investigated NOM inhibited the photooxidation of As(III) in the As(III)/CFH system at pH 7. Moreover, the correlation analysis between the pseudo-first order rate constant k obs and various property parameters of NOM showed that the stable constant for the complexation between Fe( III) and NOM (logK Fe-NOM ) as well as the molecular weight of NOM and the percentages of total acidity of NOM exhibited significant correlations. A simple quantitative structure-activity relationship (QSAR) model was established between k obs and these three parameters utilizing a multiple linear regression method, which can be employed to estimate the photooxidation efficiency of As(III) in the presence of ferric iron and NOM. Thus, the present work contributes to the understanding of the environmental interactions between NOM and iron.

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Does As(III) interact with Fe(II), Fe(III) and organic matter through ternary complexes?

Cited by 40 publications

References 46 publications

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

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

Cryptic Cycling of Complexes Containing Fe(III) and Organic Matter by Phototrophic Fe(II)-Oxidizing Bacteria

Iron(III)-induced photooxidation of arsenite in the presence of carboxylic acids and phenols as model compounds of natural organic matter

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