期刊
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
卷 282, 期 2, 页码 349-354出版社
SPRINGER
DOI: 10.1007/s10967-009-0328-8
关键词
Reductive immobilization; Selenium; Iron canister; Nuclear waste; Repository
资金
- Swedish Nuclear Fuel and Waste Management Co. (SKB), Sweden
- NAGRA, Switzerland, ONDRAF/NAIRAS, Belgium
- European Commission [WP2.5.7]
To understand the fate of Se-79 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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