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Study of colloidal particles behaviour in the PWR primary circuit conditions

Morgan Barale
Abstract : EDF wants to understand, model and limit primary circuit contamination of Pressurized Water Reactors by colloidal particles resulting from corrosion. The electrostatic behaviour of representative oxide particles (cobalt ferrite, nickel ferrite and magnetite) has been studied in primary circuit conditions with the influence of boric acid and lithium hydroxide. The isoelectric point (IEP) and the point of zero charge (PZC) of particles, measured between 5°C and 320°C, exhibit a minimum towards 200°C. The thermodynamic constants of the protonation equilibrium of surface sites were calculated. When boric acid is added, zeta potential and IEP decrease because of borate ions sorption. On the contrary, there is not effect of lithium ions. The modelling of these results under conditions representative of primary circuit shows that these oxides exhibit a negative surface charge, explaining their sorption and adhesion behaviour.
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Contributor : Ecole Chimie Paristech <>
Submitted on : Monday, June 4, 2007 - 8:00:00 AM
Last modification on : Monday, June 4, 2007 - 8:00:00 AM
Long-term archiving on: : Wednesday, September 8, 2010 - 5:01:17 PM

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  • HAL Id : pastel-00002396, version 1

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Morgan Barale. Study of colloidal particles behaviour in the PWR primary circuit conditions. Chemical Sciences. Chimie ParisTech, 2006. English. ⟨pastel-00002396⟩

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