| 1.Formation of Iron(III) oxyhydroxy sulfate mineral and mobilization of arsenic during oxidative decomposition of a natural pyrite (FeS2) |
| Sabita Aacharya, Kotaro Yonezu, Naren Gaowa Yoshihiro Okaue, Koichiro Watanabe and Takushi Yokoyama |
| The mobilization of arsenic (As) during the oxidative decomposition of a natural pyrite (FeS2) containing As was examined using hydrogen peroxide as an oxidizing reagent. The release of As into aqueous solution, however, was apparently inhibited during the oxidation process, suggesting the formation of a secondary mineral that can entrap As. From the powder X-ray diffractogram and SEM-EDX observation for solid material remained after the decomposition of FeS2, schwertmannite was detected. The fact suggests that As released during the oxidative decomposition of FeS2 may be instantaneously sorbed to schwertmannite because of more rapid sorption rate than that by goethite. |