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Atrazine Sorption–Desorption Hysteresis by Sugarcane Mulch Residue

Sturgis Hall, Department of Agronomy and Environmental Management, Louisiana State University Agricultural Center, Baton Rouge, LA 70803

View larger version (6K): [in a new window]   Fig. 1. A schematic of the proposed multireaction model (MRM) with equilibrium and kinetic adsorption sites and one first-order degradation (irreversible) reaction. The term C is concentration in soil solution, Se represents the amount sorbed on the equilibrium sites, Sk is that sorbed kinetic sites, and Si the amount retained irreversibly, where Ke, k1, k2, and k3 are the respective rates of reactions.

View larger version (21K): [in a new window]   Fig. 2. Adsorption isotherms of atrazine by sugarcane mulch residue at different reaction times. The solid lines are predictions using a linear model.

View larger version (17K): [in a new window]   Fig. 3. Measured atrazine distribution coefficient (Kd) versus adsorption reaction time for sugarcane mulch residue and Commerce soil. Error bars represent one standard deviation.

View larger version (20K): [in a new window]   Fig. 4. Adsorption isotherms for atrazine by Commerce soil for 2-, 24-, and 384-h reaction times. Solid lines are predictions using a linear model.

View larger version (26K): [in a new window]   Fig. 5. Atrazine concentration in solution during adsorption and desorption versus time. Results are from the batch kinetic experiment having a mulch to solution ratio of 1:30 and for several initial concentrations (Ci). The curves are multireaction model (MRM) predictions using the overall set of model parameters given in Table 2.

View larger version (23K): [in a new window]   Fig. 6. Amount of atrazine sorbed by sugarcane mulch residue. Results are from the batch kinetic experiment having a mulch to solution ratio of 1:30 and for several initial concentrations (Ci). The curves are multireaction model (MRM) predictions using the overall set of model parameters given in Table 2.

View larger version (30K): [in a new window]   Fig. 7. Traditional desorption isotherms of atrazine by sugarcane mulch residue. The solid line is the adsorption isotherm for the 504-h reaction. The dashed curves are predictions using the (a) multireaction model (MRM) and (b) Freundlich model.

View larger version (26K): [in a new window]   Fig. 8. Time-dependent desorption isotherms of atrazine by sugarcane mulch residue. The solid line is the adsorption isotherm for the 504-h reaction. The dashed curves are predictions using the (a) multireaction model (MRM) and (b) Freundlich model.