@article{fdi:010053158,
  title = {{M}ercury mobilization by chemical and microbial iron oxide reduction in soils of {F}rench {G}uyana},
  author = {{H}arris-{H}ellal, {J}. and {G}rimaldi, {M}ichel and {G}arnier-{Z}arli, {E}. and {B}ousserrhine, {N}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}ron oxy(hydr)oxides (oxides) are important mercury sinks in tropical oxisols and the geochemistry of these two elements are thus closely entwined. {W}e hypothesized that bacterial {F}e-oxide reduction in anoxic conditions could be a significant mechanism for mobilizing associated {H}g. {I}ron oxide and mercury solubilisation in presence of two chemical reducers (ascorbate and dithionite, dissolving amorphous and amorphous plus well crystallized {F}e-oxides, respectively) was compared to their solubilisation in presence of autochthonous ferri-reducing bacteria. {T}his work was carried out on two soil profiles from a small catchment basin in {F}rench {G}uyana, an oxisol ({O}) from a well drained slope and a water-saturated hydromorphic soil ({H}). {T}he chemical reductions showed that in the oxisol 20 and 48% of total {H}g ({H}g-{T}) was associated to amorphous and well crystallized iron oxides, respectively. {H}owever, in the hydromorphic soil, no {H}g seemed to be associated to amorphous iron oxides while the well crystallized fraction contained less than 9% of {H}g-{T}. {C}hemical {F}e-oxide reduction showed that {H}g solubility was correlated to {F}e reduction in the oxisol, demonstrating a relationship between the geochemistry of these two metals. {D}uring bacterial growth, while bacterial iron reduction solubilised up to 3.2 mg {F}e g(-1) soil in the oxisol sample, {H}g-{T} remained unchanged. {N}o mercury was detected in the culture medium either. {H}owever, chemical analysis showed a decrease of the amounts of {H}g associated to amorphous and well crystallized {F}e-oxides after 14 days of incubation, underlining the potential for iron-reducing bacteria to modify mercury distribution in soil.},
  keywords = {{M}ercury ; {I}ron oxides ; {C}hemical reduction ; {F}erri-reducing bacteria ; {F}rench {G}uyana},
  booktitle = {},
  journal = {{B}iogeochemistry},
  volume = {103},
  numero = {1-3},
  pages = {223--234},
  ISSN = {0168-2563},
  year = {2011},
  DOI = {10.1007/s10533-010-9457-y},
  URL = {https://www.documentation.ird.fr/hor/fdi:010053158},
}