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The solubility of nickel and its migration through the cementitious backfill of a geological disposal facility for nuclear waste

Felipe-Sotelo, M., Hinchliff, J., Field, L.P., Milodowski, A.E., Holt, J.D., Taylor, S.E. and Read, D. (2016) The solubility of nickel and its migration through the cementitious backfill of a geological disposal facility for nuclear waste Journal of Hazardous Materials, 314. pp. 211-219.

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Abstract

This work describes the solubility of nickel under the alkaline conditions anticipated in the near field of a cementitious repository for intermediate level nuclear waste. The measured solubility of Ni in 95%-saturated Ca(OH)2 solution is similar to values obtained in water equilibrated with a bespoke cementitious backfill material, on the order of 5 × 10−7 M. Solubility in 0.02 M NaOH is one order of magnitude lower. For all solutions, the solubility limiting phase is Ni(OH)2; powder X-ray diffraction and scanning transmission electron microscopy indicate that differences in crystallinity are the likely cause of the lower solubility observed in NaOH. The presence of cellulose degradation products causes an increase in the solubility of Ni by approximately one order of magnitude. The organic compounds significantly increase the rate of Ni transport under advective conditions and show measurable diffusive transport through intact monoliths of the cementitious backfill material.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
NameEmailORCID
Felipe-Sotelo, M.m.felipe-sotelo@surrey.ac.uk
Hinchliff, J.
Field, L.P.
Milodowski, A.E.
Holt, J.D.
Taylor, S.E.S.Taylor@surrey.ac.uk
Read, D.d.read@surrey.ac.uk
Date : 25 April 2016
DOI : 10.1016/j.jhazmat.2016.04.057
Uncontrolled Keywords : Retardation; Diffusion; Cement; Radioactive waste
Depositing User : Clive Harris
Date Deposited : 24 Sep 2018 12:42
Last Modified : 24 Sep 2018 12:42
URI: http://epubs.surrey.ac.uk/id/eprint/849424

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