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Simulation of Phytoremediation of a TNT-Contaminated Soil Using the CTSPAC Model

^a Department of Water Resources, St. Johns River Water Management District, P.O. Box 1429, Palatka, FL 32178-1429
^b Soil and Water Science Department, University of Florida, Gainesville, FL 32611-0290

View larger version (51K): [in a new window]   Fig. 1. Schematic diagram showing a compartment model for chemical transport within a plant system. The numbers are the plant compartment numbers.

View larger version (19K): [in a new window]   Fig. 2. Comparison of the predicted and the measured TNT concentrations in soil and roots during model calibration process.

View larger version (19K): [in a new window]   Fig. 3. Average hourly xylem water potential in roots, stem, and leaves of the poplar tree.

View larger version (28K): [in a new window]   Fig. 4. Simulated xylem water potentials in (a) roots, (b) stem, and (c) leaves as a function of time.

View larger version (21K): [in a new window]   Fig. 5. Simulated (a) root water uptake and (b) soil TNT concentration as a function of time.

View larger version (23K): [in a new window]   Fig. 6. Simulated TNT mass in (a) roots, (b) soil, and (c) bioavailability as a function of time. Bioavailability is the ratio of the contaminant mass (Mw) in soil solution (which is readily taken up by plants) to the contaminant mass (MT) in the soil.