Egal M. auteur aut IRD Casiot C. auteur aut IRD Morin G. auteur aut IRD Elbaz-Poulichet F. auteur aut IRD Cordier M. A. auteur aut IRD Bruneel Odile auteur aut IRD text journalArticle eng text/pdf born digital access The removal of metals and metalloids occurring in acid mine drainage has been studied on different scales (years, days). Dissolved and particulate concentrations of Fe and As were monitored over a 4-a period along Reigous Creek, an acid mine drainage from a former Pb-Zn mine in southern France. Dissolved concentrations of Fe (12-25 mmol L-1), As (0.9-3.5 mmol L-1) and SO42- (10-70 mmol L-1) exhibited seasonal variations related to rainfall, with an increase during the driest months. About 30% of the As initially present in solution as As(III) was coprecipitated with Fe oxides in the first 40 m of Reigous Creek. The corresponding As removal rate was 3.58 x 10(-7) mol L-1 s(-1). The mineralogy of resultant precipitates varied spatially and seasonally. Over the first 40 m, amorphous As(V)-Fe(III) phases and tooeleite, were formed. Sediments deposited in the bed of the creek close to the spring contained both types of solid phases. Laminated concretions, which consist of precipitates around bacterial structures, were mainly constituted of tooeleite. Further downstream, these Fe-oxide phases were replaced by schwertmannite and ferrihydrite. On a daily basis, concentrations of dissolved Fe and As have been shown to vary up to 10% during the day as a result of photoreduction of Fe-oxide phases. specialized 064 25 12 1949-1957 2010 0883-2927 https://www.documentation.ird.fr/hor/fdi:010053099 10.1016/j.apgeochem.2010.10.012 0883-2927 [F B010053099] https://www.documentation.ird.fr/hor/fdi:010053099 https://www.documentation.ird.fr/intranet/publi/2011/03/010053099.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2011-04-07 2017-08-23 fdi:010053099 fre