@article{fdi:010041425,
  title = {{S}orption and redox processes controlling transport in a stream impacted by acid arsenic fate and mine drainage},
  author = {{C}asiot, {C}. and {L}ebrun, {S}. and {M}orin, {G}. and {B}runeel, {O}dile and {P}ersonne, {J}.{C}. and {E}lbaz {P}oulichet, {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{R}eigous acid creek originating from the {C}amoules tailings impoundment supplies high concentrations of arsenic under soluble (up to similar to 4 mg/l) and particulate (up to 150 mg{A}s/g) phases to the {A}mous river, situated at the drainage basin of the {R}h6ne river ({S}outhern {F}rance). {T}he metalloid is present as {A}s({III}) (> 95%) in {R}eigous creek water while {A}s({V}) predominates (50-80%) in the solid phase, i.e. schwertmannite. {A}t the confluence between acid (p{H} < 5) creek and alkaline {A}mous river, {A}s({III}) concentrations decrease ten-fold through dilution and formation of {A}s-rich ferrihydrite ({A}s/{F}e=0.02-0.1) containing 10-30% {A}s({III}). {H}owever, these attenuation processes are not efficient in the summer heatwave of 2003 since {A}s concentrations in {A}mous river water (>= 20 mu g/l) and {A}s/{F}e ratios in particulate matter (>= 0.07) are closed to those of {R}eigous creek (:522 mu g/l and <= 0.02, respectively) or even higher. {D}ownstream the confluence, processes involved in the transport of aqueous {A}s along {A}mous river flowpath vary seasonally. {A}rsenic is transported conservatively in the aqueous phase away from the confluence in the cooler months; thus, dilution by unpolluted tributaries is the only process that decreases {A}s concentrations. {H}owever, {A}s({III}) is rapidly oxidized and {A}s({V}) remains in solution. {I}n contrast, during the warm season, desorption from {A}s-rich sediment occurs which results in an increase of {A}s({V}) and {A}s({III}) concentrations along {A}mous river flow until they reach up to similar to 20 mu g/l each. {T}herefore, {A}mous river seems not to be totally recovered from mine-related arsenic contamination after 3.5 km and may affect freshwater resources further downstream. (c) 2004 {E}lsevier {B}.{V}. {A}ll rights reserved.},
  keywords = {arsenic ; speciation ; {AMD} ; transport processes ; mine impacted river},
  booktitle = {},
  journal = {{S}cience of the {T}otal {E}nvironment},
  volume = {347},
  numero = {1-3},
  pages = {122--130},
  ISSN = {0048-9697},
  year = {2005},
  DOI = {10.1016/j.scitotenv.2004.12.039},
  URL = {https://www.documentation.ird.fr/hor/fdi:010041425},
}