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Adsorption and Transport of Arsenic(V) in Experimental Subsurface Systems

^a Dep. of Civil Engineering, 208 Harbert Engineering Center, Auburn Univ., Auburn, AL 36849
^b PBS&J, Water Resources, 5665 New Northside Drive, Suite 400, Atlanta, GA 30328
^c Dep. of Civil Engineering, Room 205K, WERC, MS 3136, Texas A&M Univ., College Station, TX 77843-3136

View larger version (15K): [in a new window]   Fig. 1. Adsorption of As(V) as a function of time (40 g soil L-1, pH 4.5, 0.01 M NaNO3). (a) Aqueous-phase and (b) solid-phase concentration.

View larger version (21K): [in a new window]   Fig. 2. Adsorbed solid versus aqueous As(V) concentration (pH 4.5, 0.01 M NaNO3).

View larger version (24K): [in a new window]   Fig. 3. Adsorption at constant As(V) concentration [5 g soil L-1, 0.01 M NaNO3, and 1 mg As(V) L-1 unless otherwise noted]. (a) Effect of pH; (b) effect of ionic strength (I), As(V) concentration, and CO3; (c) effect of PO4.

View larger version (26K): [in a new window]   Fig. 4. Relative effluent As(V) concentration versus pore volumes eluted (pH = 4.5, 0.01 M NaNO3, Co = 1 mg L-1, pore water velocity 0.53 cm min-1).

View larger version (23K): [in a new window]   Fig. 5. Effect of varying physical (pore water velocity) and chemical (pH and PO4) conditions on As(V) transport (0.01 M NaNO3 and Co = 1 mg L-1).