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Title: The solubility of technetium(IV) at high pH
Authors: Warwick, Peter
Aldridge, S.
Evans, Nick
Vines, Sarah
Keywords: technetium
reduction
solubility
high pH
Issue Date: 2007
Publisher: © Oldenbourg
Citation: WARWICK, P. ... et al, 2007. The solubility of technetium(IV) at high pH. Radiochimica Acta, 95 (12), pp. 709-716
Abstract: Technetium-99 is a β-emitting fission product of 238U. It is important when considering a safety case for nuclear waste disposal because of its high yield in radioactive waste and long half-life. The aqueous chemistry of Tc in a cementitious repository is likely to be dominated by Tc(VII), as TcO4 -, in aerobic areas and by Tc(IV), as TcO2 (am), in anaerobic. Some previous studies have shown an increase in Tc(IV) solubiltiy with increasing pH above pH 9.5 whilst others have not observed this increase. This study found that the solubility of Tc(IV) remains independent of pH until around 13.5, when a small increase can be seen which continues to increase linearly with pH. Modelling suggests that this increase occurs as the species TcO(OH)3 - is formed. The formation constant was estimated with data from this study and was found to be log K2 = -21.6 ± 0.3.
Description: This article is Restricted Access. It was published in the journal Radiochimica Acta [© Oldenbourg] and can be found at: http://www.atypon-link.com/OLD/loi/ract
URI: https://dspace.lboro.ac.uk/2134/3115
ISSN: 0033-8230
Appears in Collections:Closed Access (Chemistry)

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