Table 2.

Rate constants obtained by fitting data of aqueous SeIV removal due to sorption to clay minerals (top of table) and pyrite (middle of table) using equation (1) and (2) respectively. k′1 is the fitted, conditional, pseudo first-order rate constant which has been converted in to k1 and k−1 based on the equilibrium distribution coefficient, Kd, and the properties of the solids. In the bottom part of the table the rate constants obtained by fitting the kinetic model (equation (1), (2) and (3)) for SeIV adsorption to and reduction by Boom Clay are displayed

MineralSolid/solution (g l−1)Setot (mol l−1)A (m2 l−1)k1′ (h−1)k1 (10−3 L h−1 m−2)k−1 (h−1)Kd (ml g−1)k2 (10−3 L h−1 m−2)k3 (h−1)R2
Clay minerals
Illite du Puy*34E–817–890.060.7–3.60.191050.98
Illite du Puy0.51E–82.8–150.085.6–29.21.261300.88
Fithian Illite (this study)15.55E–587–4570.81.7–9.20.242150.85
Smecite FEBEX0.51E–82.5–7.50.022.6–8.10.192120.68
Smectite SWa-1 (this study)26.85E–5131–4020.110.3–0.80.021950.77
Smectite SWa-1, reduced (this study)155E–574–2250.020.09–0.30.03390.72
Kaolinite Georgia§101.6E–625–630.23.2–8.00.072850.86
Pyrite
Bruggeman et al. (2005)2.55E–62.20.280.94
Bruggeman et al. (2005)2.51E–62.20.670.95
Bruggeman et al. (2005)105E–68.80.680.96
Bruggeman et al. (2005)101E–68.82.60.93
Kang et al. (2011)7.51.35E–30.830.290.53
Kang et al. (2011)7.54.48E–30.830.780.96
Boom ClaySApyr[m2 g−1]
M1505E–5C:4, S:2.3 T:2.30. 20.37.145.30.85
M1* (fixed k2, fit SA)505E–5C:23, S125|S150:2.3|4.6 T125|T150:6|30. 20.37.142.60.96
M2505E–5C:4, S:2.3 T:2.30. 20.37.142.40.0420.93
  • *Bruggeman (2006).

  • The selenite adsorption onto Illite du Puy by Bruggeman (2006) consisted of two phases, adsorption and possibly occlusion. Here, the k-values and the Kd are calculated for the first, fast phase.

  • Missana et al. (2009).

  • §Bar-Yosef & Meek (1987).