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Aluminum Effect on Dissolution and Precipitation under Hyperalkaline Conditions

I. Liquid Phase Transformations

O.S. Qafoku, Pacific Northwest National Lab., Interfacial Geochemistry Group, 902 Battelle Blvd., P.O. Box 999, MSIN: K3-61, Richland, WA 99352

View larger version (28K): [in a new window]   Fig. 1. Changes in Si concentration with time and Al concentration: (a) from 0 to 42 d, and (b) from 0 to 3 d.

View larger version (29K): [in a new window]   Fig. 2. Changes in Fe concentration with time and Al concentration: (a) from 0 to 42 d, and (b) from 0 to 3 d.

View larger version (25K): [in a new window]   Fig. 3. Changes in K concentration with time and Al concentration: (a) from 0 to 42 d, and (b) from 0 to 3 d.

View larger version (22K): [in a new window]   Fig. 4. Changes in Al concentration from 0 to 42 d in the treatments of the Batch 1 study.

View larger version (24K): [in a new window]   Fig. 5. Dissolution reaction order with respect to initial Al concentration in the soil solution, based on Si release by (a) 4 h and (b) 3 d. The straight lines are the linear regression fits and dotted lines are the 95% confidence intervals.

View larger version (22K): [in a new window]   Fig. 6. Dissolution reaction order with respect to initial Al concentration in the soil solution, based on Fe release by 4 h. The straight lines are the linear regression fits and dotted lines are the 95% confidence intervals.

View larger version (23K): [in a new window]   Fig. 7. Dissolution reaction order with respect to initial Al concentration in the soil solution, based on K release by (a) 2 d and (b) 3 d. The straight lines are the linear regression fits and dotted lines are the 95% confidence intervals.

View larger version (24K): [in a new window]   Fig. 8. Semilog plot of log[Al] vs. time in different treatments of the Batch 1 study: (a) 0.055, (b) 0.11, (c) 0.165, and (d) 0.22 mol L-1 Al. The straight lines are the linear regression fits and the dotted lines are the 95% confidence intervals.

View larger version (23K): [in a new window]   Fig. 9. Precipitation reaction order with respect to initial Al concentration in the soil solution based on the amount of Si and Fe removed from the soil solution in the time periods from 3 to 7 d (Si), and 2 to 3 d (Fe).