Predominance of aqueous Tl(I) species in the river system downstream from the abandoned Carnoulès mine (Southern France).

Thallium concentration reached up to 534 μg L(-1) in the Reigous acid mine drainage downstream from the abandoned Pb-Zn Carnoulès mine (Southern France). It decreased to 5.44 μg L(-1) in the Amous River into which the Reigous creek flows.