@article{fdi:010061407,
  title = {{A}rsenic cavenging by aluminum-substituted ferrihydrites in a circumneutral ph river impacted by acid mine drainage},
  author = {{A}dra, {A}. and {M}orin, {G}. and {O}na-{N}guema, {G}. and {M}enguy, {N}. and {M}aillot, {F}. and {C}asiot, {C}. and {B}runeel, {O}dile and {L}ebrun, {S}. and {J}uillot, {F}arid and {B}rest, {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{F}errihydrite ({F}h) is a nanocrystalline ferric oxyhydroxide involved in the retention of pollutants in natural systems and in water-treatment processes. {T}he status and properties of major chemical impurities in natural {F}h is however still scarcely documented. {H}ere we investigated the structure of aluminum-rich {F}h, and their role in arsenic scavenging in river-bed sediments from a circumneutral river (p{H} 6-7) impacted by an arsenic-rich acid mine drainage ({AMD}). {E}xtended {X}-ray absorption fine structure ({EXAFS}) spectroscopy at the {F}e {K}-edge shows that {F}h is the predominant mineral phase forming after neutralization of the {AMD}, in association with minor amount of schwertmannite transported from the {AMD}. {TEM}-{EDXS} elemental mapping and {SEM}-{EDXS} analyses combined with {EXAFS} analysis indicates that {A}l3+ substitutes for {F}e3+ ions into the {F}h structure in the natural sediment samples, with local aluminum concentration within the 25-30 +/- 10 mol %{A}l range. {S}ynthetic aluminous {F}h prepared in the present study are found to be less {A}l-substituted (14-20 +/- 5 mol %{A}l). {F}inally, {EXAFS} analysis at the arsenic {K}-edge indicates that {A}s({V}) form similar inner-sphere surface complexes on the natural and synthetic {A}l-substituted {F}h studied. {O}ur results provide direct evidence for the scavenging of arsenic by natural {A}l-{F}h, which emphasize the possible implication of such material for scavenging pollutants in natural or engineered systems.},
  keywords = {{FRANCE}},
  booktitle = {},
  journal = {{E}nvironmental {S}cience and {T}echnology},
  volume = {47},
  numero = {22},
  pages = {12784--12792},
  ISSN = {0013-936{X}},
  year = {2013},
  DOI = {10.1021/es4020234},
  URL = {https://www.documentation.ird.fr/hor/fdi:010061407},
}