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Alachlor Transport during Transient Water Flow in Unsaturated Soils

Agronomy Dep., LAES, Louisiana State Univ., Baton Rouge, LA 70803

View larger version (21K): [in a new window]   Fig. 1. Experimental setup for horizontal infiltration of alachlor and tritium solution into a column of dry soil.

View larger version (21K): [in a new window]   Fig. 2. Measured and calculated soil moisture content versus horizontal distance in the NTW, CTW, and CTV soil columns.

View larger version (19K): [in a new window]   Fig. 3. Measured soil water diffusivity versus soil moisture content for the NTW, CTW, and CTV soil columns.

View larger version (17K): [in a new window]   Fig. 4. Measured soil moisture content and tritium concentration versus horizontal distance in the NTW soil column.

View larger version (28K): [in a new window]   Fig. 5. Measured soil-water, methanol, and total extractable alachlor concentration versus horizontal distance in the NTW, CTW, and CTV soil columns.

View larger version (25K): [in a new window]   Fig. 6. Total concentration of alachlor versus horizontal distance in the NTW, CTW, and CTV soil columns. Solid curves are based on the kinetic multireaction model where model parameters were independently derived from batch kinetic and miscible displacement (transport) experiments given in Table 3 and 4, respectively.

View larger version (21K): [in a new window]   Fig. 7. Alachlor concentration in soil solution versus time from kinetic batch experiment for Gigger soil (CTW treatment) for a wide range of initial concentrations (Ci's). Solid curves are based on the kinetic mutlireaction model.

View larger version (23K): [in a new window]   Fig. 8. Measured sorption isotherms for Gigger soil after 1 d of reaction for the NTW, CTW, and CTV treatments. Solid curves are fitted based on nonlinear (Freundlich) adsorption.

View larger version (23K): [in a new window]   Fig. 9. Total concentration of alachlor versus horizontal distance in the NTW, CTW, and CTV soil columns. Solid curves are based on steady-state flow and linear equilibrium (CXTFIT model).

View larger version (24K): [in a new window]   Fig. 10. Total concentration of alachlor versus horizontal distance in the NTW, CTW, and CTV soil columns. Solid and dashed curves are based on alachlor transport in unsaturated and transient flow conditions. Retention was characterized by linear (Kd) and Freundlich (Kf and N) equilibrium models.