Issue 6, 2003
From the journal:

Journal of Environmental Monitoring

Uranium(vi) interactions with OPC/PFA grout†

M. Sutton,*ab   P. Warwickb  and  A. Hallb  

* Corresponding authors

a Currently at Lawrence Livermore National Laboratory, Livermore, USA
E-mail: Sutton18@llnl.gov
Fax: 1-925-422-3160
Tel: 1-925-424-2137

b Department of Chemistry, Loughborough University, UK
E-mail: P.Warwick@lboro.ac.uk
Fax: 01509-223925
Tel: 01509-222585

Abstract

The sorption of uranium on to Ordinary Portland Cement (OPC)/Pulverized Fuel Ash (PFA, fly ash) grout material has been investigated with respect to time, pH, grout:uranium ratio and the chemical composition of the supporting solution. The information obtained is of relevance to the disposal of low-level nuclear waste. The grout material has been chemically characterised and is negatively charged above pH 2.3. At the uranium concentrations studied (2 µM) all uranyl hydroxide aqueous species are expected to be monomeric, rather than polymeric. Uranium(VI) sorption on to the grout material has been explained in terms of inner sphere complexation binding by means of hydroxide bridge formation between the uranium and grout surface. It is also proposed that oligomeric uranyl species are formed across the grout surface, perhaps stabilising the repulsive effects of the negatively charged grout surface and anionic uranyl hydroxide species. Thermodynamic modelling has been used to explain the sorption variation versus solution pH and identifies potential binding mechanisms.

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Article information

DOI
https://doi.org/10.1039/B308554F
Article type
Paper
Submitted
05 Aug 2003
Accepted
20 Oct 2003
First published
03 Nov 2003

J. Environ. Monit., 2003,5, 922-928

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Uranium(VI) interactions with OPC/PFA grout

M. Sutton, P. Warwick and A. Hall, J. Environ. Monit., 2003, 5, 922 DOI: 10.1039/B308554F

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