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Role of Competitive Cation Exchange on Chromatographic Displacement of Cesium in the Vadose Zone beneath the Hanford S/SX Tank Farm

^a Los Alamos National Laboratory, SM-30 Bikini Atoll Rd., Los Alamos, NM 87545
^b Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352
^c Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., MS 90-1116, Berkeley, CA 94720
^d Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, CA 94550-9234

View larger version (28K): [in a new window]   Fig. 1. Distribution coefficient for Cs+ exchanging with Na+ on Hanford sediments plotted as a function of aqueous Cs+ concentration for different Na+ concentrations indicated in the figure using the Steefel et al. (2003) selectivity coefficients at 25°C listed in Table 2. Also shown for the 20 M Na+ case is the distribution coefficient calculated at 65°C but using Steefel et al. (2003) selectivity coefficients determined at 25°C (up triangle), and compared with selectivity coefficients measured by Liu et al. (2003b) at 65°C (down triangle).

View larger version (19K): [in a new window]   Fig. 2. Mobility ratio (/µ)l/(/µ) for 0.1, 1, 4, and 8 m NaNO3 solutions compared with pure water plotted as a function of temperature. Points refer to data taken from Isono (1984).

View larger version (24K): [in a new window]   Fig. 3. Transient and steady-state water saturation profiles resulting from a tank leak with volume and duration given in the text with a steady surface infiltration rate of 0.08 m yr4. Indicated in the figure are the positions of the different stratigraphic units listed in Table 3.

View larger version (31K): [in a new window]   Fig. 4. Calculated solute and pH profiles for an elapsed time of 35 yr compared with field observations (symbols) taken from Well 299-W23-19 at the SX-115 tank (Serne et al., 2001a).

View larger version (23K): [in a new window]   Fig. 5. Calculated Mg2+ and K+ profiles for an elapsed time of 35 yr compared with field observations (symbols) taken from Well 299-W23-19 at the SX-115 tank (Serne et al., 2001a).

View larger version (24K): [in a new window]   Fig. 6. Calculated total Na+, Cs+, and sorbed SCs+ profiles as a function of depth at the indicated times ranging from 1 to 75 yr for a 0.75 m NaNO3 source concentration corresponding to Tank SK-115.

View larger version (25K): [in a new window]   Fig. 7. Calculated total Na+, Cs+, and sorbed SCs+ profiles as a function of depth at the indicated times for 5 m NaNO3 source concentration.

View larger version (26K): [in a new window]   Fig. 8. Calculated total Na+, Cs+, and sorbed SCs+ profiles as a function of depth at the indicated times for 10 m NaNO3 source concentration.

View larger version (27K): [in a new window]   Fig. 9. Calculated total Na+, Cs+, and sorbed SCs+ profiles as a function of depth at the indicated times for 15 m NaNO3 source concentration.

View larger version (29K): [in a new window]   Fig. 10. Calculated total Na+, Cs+, and sorbed SCs+ profiles as a function of depth at the indicated times for 20 m NaNO3 source concentration. The symbols refer to measured Cs+ concentrations from the slant borehole (Serne et al., 2001b).