@article{fdi:010088687,
  title = {{A}ntimony isotopic fractionation during {S}b({III}) oxidation to {S}b({V}) : biotic and abiotic processes},
  author = {{F}errari, {C}. and {R}esongles, {E}l{\'e}onore and {H}{\'e}ry, {M}. and {D}{\'e}soeuvre, {A}. and {F}reydier, {R}. and {D}elpoux, {S}. and {B}runeel, {O}dile and {C}asiot, {C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{O}xidation of antimonite ({S}b({III})) to antimonate ({S}b({V})) plays an important role in the control of {S}b mobility in aquatic systems. {F}ractionation of {S}b isotopes (123{S}b/121{S}b) during {S}b({III}) oxidation has been investigated in the present study at concentrations relevant to mining environments. {T}he isotopic composition (8123{S}b) of dissolved {S}b({III}) and {S}b({V}) species was analysed during biotic oxidation of {S}b({III}) at p{H} 6 and -0.1 m{M} {S}b. {B}iotic experiments used a aio{A} gene carrier bacterial strain of the genus {E}nsifer isolated from {S}b-rich river sediments. {C}hemical oxidation experiments with {H}2{O}2 were also conducted either in {N}a{NO}3 or {HC}l medium. {D}uring biotic oxidation, the {S}b({V}) produced was enriched in the light isotope compared to {S}b({III}), with an apparent fractionation factor {A}123{S}b{S}b({V})-{S}b({III}) of-0.20 +/- 0.07 %o. {T}he {A}123{S}b value was independent of the oxidation kinetics within the range 0.03 to 0.05 mu mol.{L}-1.min- 1; the fractionation observed was rather attributed to kinetic effect that weakens over time in the experiments, although this hypothesis would require further investigation. {D}uring abiotic experiments in {N}a{NO}3 medium, the {S}b({V}) produced was not isotopically fractionated relatively to {S}b({III}), while in {HC}l medium, the {S}b({V}) produced was enriched with the heavier isotope relatively to {S}b({III}), with a {R}ayleigh fractionation factor e123{S}b of +0.30 +/- 0.05 %o. {T}hese differences were attributed to different reaction pathways involving multi-step reactions and either hydroxy-or chloride-{S}b species. {A}ltogether, these results showed a low fractionation of {S}b isotopes during {S}b({III}) oxidation, although significant variability occurred according to experimental conditions. {F}urther experimental research and confrontation with natural systems is necessary before applying {S}b isotopes as process tracer in water.},
  keywords = {{A}ntimony ; {I}sotopes ; {O}xidation ; {B}acteria ; {F}ractionation},
  booktitle = {},
  journal = {{C}hemical {G}eology},
  volume = {641},
  numero = {},
  pages = {121788 [9 p.]},
  ISSN = {0009-2541},
  year = {2023},
  DOI = {10.1016/j.chemgeo.2023.121788},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088687},
}