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Evaluation of the Fluoride Retardation Factor in Unsaturated and Undisturbed Soil Columns

Département des Sols et de Génie Agroalimentaire, FSAA, Université Laval, Québec, QC, Canada, G1K 7P4

View larger version (15K): [in a new window]   Fig. 1. Column experiment setup.

View larger version (13K): [in a new window]   Fig. 2. Bromide and F breakthrough curves obtained with a tension table. The solid and dashed lines represent the CDE model adjusted to the Br and F breakthrough curves, respectively.

View larger version (23K): [in a new window]   Fig. 3. Examples of Br (diamonds) and F (circles) breakthrough curves obtained in each soil layer. Three columns were used for each soil layer, except for Site B (40–50 cm), where two columns were used. The solid lines represent the CDE model adjusted to the Br and F breakthrough curves. The CLT model is not represented but is nearly indistinguishable from the CDE model. Two F breakthrough curves are presented for Site C (20–40 cm) to show the strong variation of F retention observed in different columns of that soil layer. No F was detected in the effluent of the columns of Sites A, B, and D.

View larger version (26K): [in a new window]   Fig. 4. Examples of F accumulation profiles in each soil layer. Three columns were used for each soil layer, except for Site B (40–50 cm), where two columns were used. Data points represent the increase in F total resident concentration. The vertical dotted line is at 0 mg F L-1 soil. The solid and dotted curves represent the CDE and CLT models adjusted to the accumulation profile, respectively.