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According to thermodynamic calculations performed under the reducing conditions imposed by pyrite and organic matter in Boom Clay (the reference host rock in Belgium), selenium is expected to be present under reduced forms. This is well illustrated by a Pourbaix diagram (Fig. 1). In situ, the pH of Boom Clay interstitial water (BCW, mainly NaHCO3 0.02mol/l; Dierckx, 1997;Maes et al., 2002) is equal to 8.2, and the redox potential ranges from 0.2 to 0.4V(vs. SHE). Under these conditions, selenium concentration (and thus mobility) should be limited by the low solubility of minerals such as FeSe2 or Se(0).

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