@article{fdi:010083242,
  title = {{I}n situ arsenic speciation at the soil/water interface of saline-alkaline lakes of the {P}antanal, {B}razil : a {DGT}-based approach},
  author = {{V}iana, {J}. {L}. {M}. and de {S}ouza, {A}. {F}. and {H}ernandez, {A}. {H}. and {E}lias, {L}. {P}. and {E}ismann, {C}. {E}. and {R}ezende, {A}. {T}. and {B}arbi{\'e}ro, {L}aurent and {M}enegario, {A}. {A}. and {F}ostier, {A}. {H}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}rsenic ({A}s) is a naturally occurring element in the {E}arth's crust, exhibiting toxicity towards a wide range of living organisms. {I}ts properties and environmental dynamics are strongly regulated by its speciation, and the species {A}s ({III}) and {A}s({V}) are the most commonly found in environmental systems. {R}ecently, high concentrations of {A}s were found in saline-alkaline lakes of the {P}antanal ({B}razil), which is the largest wetland area in the world. {T}herefore, we evaluated {A}s contamination and its redox speciation ({A}s({III}) and {A}s({V})) at the soil/water interface of biogeochemically distinct saline-alkaline lakes of {P}antanal wetlands ({B}razil). {B}oth conventional sampling and in situ diffusive gradients in thin films ({DGT}) technique were employed. {Z}irconium oxide and 3-mercaptopropyl were used as ligand phases in {DGT} to selectively bind {A}s species. {H}igh concentrations of total dissolved {A}s in a shallow water table were found (<2337.5 mu g {L}-1), whereas levels in soils were up to 2.4 mu g g(-1). {D}istinct scenarios were observed when comparing speciation analysis through spot sampling and {DGT}. {C}onsidering spot sampling, {A}s({V}) was the main species detected, whereas {A}s({III}) was only detected in only a few samples (<4.2 mu g {L}-1). {C}onversely, results obtained by {DGT} showed that labile {A}s({III}) dominated arsenic speciation at the soil/water interface with levels up to 203.0 mu g {L}-1. {C}oupling {DGT} data and {DGT} induced fluxes in sediments and soils model allowed obtaining kinetic data, showing that the soil barely participated in the arsenic dynamics on the shore of the lakes, and that this participation depends on the evapoconcentration process occurring in the region. {T}herefore, soil acts like a nonreactive matrix depending on the natural concentration process. {I}n addition, our results reinforced the different geochemical characteristics of the studied saline-alkaline lakes and highlights the importance of robust passive sampling techniques in the context of metal/metalloid speciation in environ-mental analysis.},
  keywords = {{A}rsenic ; {P}antanal ; {S}peciation ; {D}iffusive gradients in thin films ; {BRESIL} ; {PANTANAL}},
  booktitle = {},
  journal = {{S}cience of the {T}otal {E}nvironment},
  volume = {804},
  numero = {},
  pages = {150113 [10 p.]},
  ISSN = {0048-9697},
  year = {2022},
  DOI = {10.1016/j.scitotenv.2021.150113},
  URL = {https://www.documentation.ird.fr/hor/fdi:010083242},
}