Reductive capacity measurement of waste forms for secondary radioactive wastes

JOURNAL OF NUCLEAR MATERIALS

卷:467

Article

Um, Wooyong^1,2  Yang, Jung-Seok³  Serne, R. Jeffrey¹  Westsik, Joseph H.¹ 

[1] PNNL, Energy & Environm Directorate, Richland, WA 99354 USA

[2] Pohang Univ Sci & Technol POSTECH, Div Adv Nucl Engn, Pohang 790784, South Korea

[3] Korea Inst Sci & Technol, Nat Prod Res Ctr, Kangnung 25451, South Korea

关键词: Reductive capacity;    Waste form;    Blast furnace slag;    Cast stone;    Geopolymer;    Ceramicrete;   

DOI  :  10.1016/j.jnucmat.2015.09.045

来源: Elsevier

【 摘 要 】

The reductive capacities of dry ingredients and final solid waste forms were measured using both the Cr(VI) and Ce(IV) methods and the results were compared. Blast furnace slag (BFS), sodium sulfide, SnF2, and SnCl2 used as dry ingredients to make various waste forms showed significantly higher reductive capacities compared to other ingredients regardless of which method was used. Although the BFS exhibits appreciable reductive capacity, it requires greater amounts of time to fully react. In almost all cases, the Ce(IV) method yielded larger reductive capacity values than those from the Cr(VI) method and can be used as an upper bound for the reductive capacity of the dry ingredients and waste forms, because the Ce(IV) method subjects the solids to a strong acid (low pH) condition that dissolves much more of the solids. Because the Cr(VI) method relies on a neutral pH condition, the Cr(VI) method can be used to estimate primarily the waste form surface-related and readily dissolvable reductive capacity. However, the Cr(VI) method does not measure the total reductive capacity of the waste form, the long-term reductive capacity afforded by very slowly dissolving solids, or the reductive capacity present in the interior pores and internal locations of the solids. Published by Elsevier B.V.

【 授权许可】

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