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However, it is difficult to know when the thermodynamic equilibrium between the radionuclides present in the waste packages and the surrounding geological environment will be established. Kinetics of selenium redox reaction are slow (Foster et al., 2003). Se species are often found in redox disequilibrium and oxidized species might persist in reducing environments. Selenite concentration in reducing conditions representative for Boom Clay will be governed by sorption followed by a reduction¨Cprecipitation mechanism, while selenate is likely not sorbed nor easily reduced (Bruggeman et al., 2002). The study of selenatemigration in Boom Clay requires thus a higher priority, as it might be the most mobile selenium species in the host rock.

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