ABSTRACT
ABSTRACT: The considerable amount of hazardous arsenic detected in the seepage water of the uranium tailings of Schneckentein suggest that high attention to that metalloid is necessary A hydrochemical study was conducted to define the different chemical parameters of pore waters in the tailing system. Also, to determine the fate of arsenic contained within the solid matter, it is important to identify its forms present and assess its mobility. Thus, a seven steps sequential extraction was conducted. The measured E
2-are the most frequent arsenic species with the dominance of the last mentioned one with a share exceeding 60%. Also, the geochemical procedure confirms its high mobility and most of the non residual arsenic is in association with the nodular hydrogenous fraction (between 75 and 98%) with the dominance of the moderately reducible phase.
