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Article Dans Une Revue Science of the Total Environment Année : 2020

Dissolved organic matter controls of arsenic bioavailability to bacteria

Martin Pothier
  • Fonction : Auteur
Véronique Lenoble
Cédric Garnier
Benjamin Misson
Charlotte Rentmeister
  • Fonction : Auteur
Alexandre Poulain
  • Fonction : Auteur

Résumé

The presence of arsenic in irrigation and drinking waters is a threat to worldwide human health. Dissolved organic matter (DOM) is a ubiquitous and photoreactive sorbent of arsenic, capable of both suppressing and enhancing its mobility. Microbes can control the mobilization of mineral-bound arsenic, through redox processes thought to occur intracellularly. The role that DOM plays on the bioavailability of arsenic to microbes is often invoked but remains untested experimentally. Here, using a whole-cell biosensor, we tested the role of DOM on As (III) and As(V) bioavailability. Using cation amendments, we explored the nature of As-DOM interactions. We found As bioavailability to be dependent on [As]/[DOM] ratio and on the strength of As binding to DOM which varied as a function of time. We further tested the role of DOM on As(III) photooxidation and showed that As (III) photooxidation rate is limited by the strength of its interactions with DOM and sensitive to ionic competitive desorption. Our study demonstrates the dynamic control that photoreactive DOM poses on the bioavailability and reactivity of As in the environment and highlights the kinetic controls that DOM can possibly exert on As toxicity at various levels in foodwebs.
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Dates et versions

hal-03027565 , version 1 (21-02-2021)

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Martin Pothier, Véronique Lenoble, Cédric Garnier, Benjamin Misson, Charlotte Rentmeister, et al.. Dissolved organic matter controls of arsenic bioavailability to bacteria. Science of the Total Environment, 2020, 716, pp.137118. ⟨10.1016/j.scitotenv.2020.137118⟩. ⟨hal-03027565⟩
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