Influence of organic matters on AsIII oxidation by the microflora of polluted soils - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Environmental Geochemistry and Health Année : 2016

Influence of organic matters on AsIII oxidation by the microflora of polluted soils

Résumé

The global AsIII-oxidizing activity of microorganisms in eight surface soils from polluted sites was quantified with and without addition of organic substrates. The organic substances provided differed by their nature: either yeast extract, commonly used in microbiological culture media, or a synthetic mixture of defined organic matters (SMOM) presenting some common features with natural soil organic matter. Correlations were sought between soil characteristics and both the AsIII-oxidizing rate constants and their evolution in accordance with inputs of organic substrates. In the absence of added substrate, the global AsIII oxidation rate constant correlated positively with the concentration of intrinsic organic matter in the soil, suggesting that AsIII-oxidizing activity was limited by organic substrate availability in nutrient-poor soils. This limitation was, however, removed by 0.08 g/L of added organic carbon. In most conditions, the AsIII oxidation rate constant decreased as organic carbon input increased from 0.08 to 0.4 g/L. Incubations of polluted soils in aerobic conditions, amended or not with SMOM, resulted in short-term As mobilization in the presence of SMOM and active microorganisms. In contrast, microbial AsIII oxidation seemed to stabilize As when no organic substrate was added. Results suggest that microbial speciation of arsenic driven by nature and concentration of organic matter exerts a major influence on the fate of this toxic element in surface soils.
Fichier principal
Vignette du fichier
EGAH-D-15-00144-Articlesols-AGAH-revised.pdf (960.68 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

insu-01237137 , version 1 (10-12-2015)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

Citer

Tiffanie Lescure, J. Moreau, C. Charles, T. Ben Ali Saanda, Hugues Thouin, et al.. Influence of organic matters on AsIII oxidation by the microflora of polluted soils. Environmental Geochemistry and Health, 2016, 38 (3), pp.911-925. ⟨10.1007/s10653-015-9771-3⟩. ⟨insu-01237137⟩
241 Consultations
261 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More