Release of arsenite, arsenate and methyl-arsenic species from streambed sediment affected by acid mine drainage: a microcosm study
Marina Héry A D , Corinne Casiot A C D , Eléonore Resongles A , Zoe Gallice A , Odile Bruneel A B , Angélique Desoeuvre A and Sophie Delpoux A
+ Author Affiliations
- Author Affiliations
A Laboratoire HydroSciences Montpellier, HSM, UMR 5569 (IRD, CNRS, Universités Montpellier 1 et 2), Université Montpellier 2, Place E. Bataillon, CC MSE, F-34095 Montpellier, France.
B Laboratoire Mixte International Biotechnologie Microbienne et Végétale; Laboratoire de Microbiologie et Biologie Moléculaire, Faculté des Sciences, Avenue Ibn Batouta BP1014, Université Mohammed V. Rabat, Morocco.
C Corresponding author: casiot@msem.univ-montp2.fr
D Both authors contributed equally to this work.
Environmental Chemistry 11(5) 514-524 https://doi.org/10.1071/EN13225
Submitted: 10 December 2013 Accepted: 5 May 2014 Published: 14 August 2014
Environmental context. Arsenic-rich waters generated from the oxidation of mining wastes are responsible for the severe contamination of river waters and sediments located downstream from mining sites. Under certain environmental conditions, the affected riverbed sediments may represent a reservoir for arsenic from which this toxic element may be released into water, mainly as a consequence of microbial activity.
Abstract. The (bio-)geochemical processes driving As mobilisation from streambed sediments affected by acid mine drainage (AMD) were investigated, and the structure of the bacterial community associated with the sediments was characterised. Microcosm experiments were set up to determine the effect of oxygen, temperature (4 and 20 °C) and microbial activity on As mobilisation from contrasting sediments collected during high- (November 2011) and low- (March 2012) flow conditions in the Amous River, that received AMD. Distinct bacterial communities thrived in the two sediments, dominated by Rhodobacter spp., Polaromonas spp. and Sphingomonads. These communities included only few bacteria known for their capacity to interact directly with As, whereas biogeochemical processes appeared to control As cycling. Major As mobilisation occurred in the AsIII form at 20 °C in anoxic conditions, from both November and March sediments, as the result of successive biotic reductive dissolution of Mn- and Fe-oxyhydroxides. The later process may be driven by Mn- and Fe-reducing bacteria such as Geobacter spp. and possibly occurred in combination with microbially mediated AsV reduction. The involvement of other bacteria in these redox processes is not excluded. Biomethylation occurred only with the sediments collected at low-flow during oxic and anoxic conditions, although no bacteria characterised so far for its ability to methylate As was identified. Finally, sorption equilibrium of AsV onto the sediment appeared to be the main process controlling AsV concentration in oxic conditions. Comparison with field data shows that the later process, besides biomethylation, may be of relevance to the As fate in AMD-affected streams.
Additional keywords: bacterial communities, biomethylation.
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