@article{fdi:010062627,
  title = {{R}elease of arsenite, arsenate and methyl-arsenic species from streambed sediment affected by acid mine drainage : a microcosm study},
  author = {{H}{\'e}ry, {M}. and {C}asiot, {C}. and {R}esongles, {E}. and {G}allice, {Z}. and {B}runeel, {O}dile and {D}esoeuvre, {A}. and {D}elpoux, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he (bio-)geochemical processes driving {A}s 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. {M}icrocosm experiments were set up to determine the effect of oxygen, temperature (4 and 20 degrees {C}) and microbial activity on {A}s mobilisation from contrasting sediments collected during high- ({N}ovember 2011) and low- ({M}arch 2012) flow conditions in the {A}mous {R}iver, that received {AMD}. {D}istinct bacterial communities thrived in the two sediments, dominated by {R}hodobacter spp., {P}olaromonas spp. and {S}phingomonads. {T}hese communities included only few bacteria known for their capacity to interact directly with {A}s, whereas biogeochemical processes appeared to control {A}s cycling. {M}ajor {A}s mobilisation occurred in the {A}s-{III} form at 20 degrees {C} in anoxic conditions, from both {N}ovember and {M}arch sediments, as the result of successive biotic reductive dissolution of {M}n- and {F}e-oxyhydroxides. {T}he later process may be driven by {M}n- and {F}e-reducing bacteria such as {G}eobacter spp. and possibly occurred in combination with microbially mediated {A}s-{V} reduction. {T}he involvement of other bacteria in these redox processes is not excluded. {B}iomethylation 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 {A}s was identified. {F}inally, sorption equilibrium of {A}s-{V} onto the sediment appeared to be the main process controlling {A}s-{V} concentration in oxic conditions. {C}omparison with field data shows that the later process, besides biomethylation, may be of relevance to the {A}s fate in {AMD}-affected streams.},
  keywords = {bacterial communities ; biomethylation ; {FRANCE}},
  booktitle = {},
  journal = {{E}nvironmental {C}hemistry},
  volume = {11},
  numero = {5},
  pages = {514--524},
  ISSN = {1448-2517},
  year = {2014},
  DOI = {10.1071/en13225},
  URL = {https://www.documentation.ird.fr/hor/fdi:010062627},
}