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Colloid Mobilization and Arsenite Transport in Soil Columns: Effect of Ionic Strength

Sturgis Hall, School of Plant, Environmental and Soil Sciences, LSU, Baton Rouge, LA 70803. Contribution from Louisiana State Univ. Agric Center as manuscript no. 07-14-0027

View larger version (18K): [in this window] [in a new window]   Fig. 1. Effluent turbidity during injection of 10 mg L–1 As(III) in 0.01 M NaCl followed by leaching with deionized water (DIW) for the Olivier and Windsor soil columns. Arrows indicate pore volumes when flow interruptions occurred.

View larger version (18K): [in this window] [in a new window]   Fig. 2. Effluent pH during injection of 10 mg L–1 As(III) in 0.01 M NaCl followed by leaching with deionized water (DIW) for the Olivier and Windsor soil columns. Arrows indicate pore volumes when flow interruptions occurred.

View larger version (17K): [in this window] [in a new window]   Fig. 3. Effluent electrical conductivity (EC) during injection of 10 mg L–1 As(III) in 0.01 M NaCl followed by leaching with deionized water (DIW) for the Olivier and Windsor soil columns. Arrows indicate pore volumes when flow interruptions occurred.

View larger version (20K): [in this window] [in a new window]   Fig. 4. Breakthrough curves (BTC) of total (<20 µm) and dissolved (<0.2 µm) arsenic for the Olivier and Windsor soil columns. Arrows indicate pore volumes when flow interruptions or leaching with deionized water (DIW) occurred.

View larger version (20K): [in this window] [in a new window]   Fig. 5. The percentage recoveries of arsenic from different soil column depths. Agents used for extractions were: exchangeable (1 M MaCl2), strongly sorbed (1 M NaH2PO4), precipitated (0.2 M ammonium oxalate), and recalcitrant (16 M HNO3).

View larger version (16K): [in this window] [in a new window]   Fig. 6. X-ray diffractograms (XRD) of colloids in the composite effluent solution of the Olivier soil column.

View larger version (22K): [in this window] [in a new window]   Fig. 7. Mobilization of total (<20 µm) and dissolved (<0.2 µm) iron fractions from the Olivier and Windsor soil columns. Arrows indicate pore volumes when flow interruptions or leaching with deionized water (DIW) occurred.

View larger version (22K): [in this window] [in a new window]   Fig. 8. Mobilization of total (<20 µm) and dissolved (<0.2 µm) aluminum fractions from the Olivier and Windsor soil columns. Arrows indicate pore volumes when flow interruptions or leaching with deionized water (DIW) occurred.