ABSTRACT: To understand the fate of 79Se in a repository-like environment, the interactions between iron canister surface with dissolved selenite (SeO3
2−) and selenate (SeO4
2−) in anaerobic solutions have been investigated. Se(IV) immobilization on iron surface was observed to be about 100 times
faster than that of Se(VI) at same conditions. An iron surface coated with a FeCO3 layer corrosion product is more reactive than a polished iron to immobilize Se(IV) and Se(VI). The reacted iron surfaces
were analysed by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), X-ray diffraction (XRD), Raman
spectrometry and micro-X-ray Absorption Spectroscopy (XAS). The result show that Se(IV) and Se(VI) were reduced and precipitated.
The dominating phase was found to be FeSe2.
Journal of Radioanalytical and Nuclear Chemistry 05/2012; 282(2):349-354. · 1.52 Impact Factor