Reductive immobilization of 79Se by iron canister under simulated repository environment

Cui, D.; Puranen, A.; Devoy, J.; Scheidegger, A.; Leupin, O.X.; Wersin, Paul; Gens, R.; Spahiu, K. (2009). Reductive immobilization of 79Se by iron canister under simulated repository environment. Journal of Radioanalytical and Nuclear Chemistry, 282(2), pp. 349-354. Springer 10.1007/s10967-009-0328-8

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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.

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