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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/12644

Title: The complexation of Tc(IV) with EDTA and picolinic acid at high pH
Authors: Evans, Nick
Hallam, Ricky
Keywords: Barrier system
Picolinic acid
Radionuclide transport
Issue Date: 2012
Publisher: © The Mineralogical Society
Citation: EVANS, N. and HALLAM, R., 2012. The complexation of Tc(IV) with EDTA and picolinic acid at high pH. Mineralogical Magazine, 76 (8), pp. 3435 - 3438.
Abstract: In the UK, technetium may be disposed of in a high pH, low Eh cementitious repository. In such a scenario, its chemistry would be dominated by TcO4−, in aerobic conditions and the sparingly soluble TcO2(s) in anaerobic conditions. Repository heterogeneity could mean that both Tc(VII) and Tc(IV) are present simultaneously. The anthropogenic ligands EDTA and picolinic acid are commonly used as decontamination agents and are likely to be present in intermediate-level waste (ILW). They could complex with Tc(IV) increasing its aqueous concentration and mobility in the cement porewaters and beyond. The conditional stability constants (measured in 0.3 mol dm−3 NaOH) for the Tc(IV)-EDTA and Tc(IV)-picolinic acid complexes have been determined to be: βTc(IV)−EDTA = 1.6 × 1026, which corresponds to log β = 25.2±0.6; and βTc(IV)−PA = 8.65 × 1026, which corresponds to log β = 26.9±0.1, respectively.
Description: Closed access. This article was published in the journal, Mineralogical Magazine [© Mineralogical Society] and the definitive version is available on Ingenta Connect.
Version: Published
DOI: 10.1180/minmag.2012.076.8.56
URI: https://dspace.lboro.ac.uk/2134/12644
Publisher Link: http://dx.doi.org/10.1180/minmag.2012.076.8.56
Appears in Collections:Closed Access (Chemistry)

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