Fig. 9. Influence of (a) time and (b) effluent volume on leaching of imazaquin from soil as described by Elovich kinetics. Initial imazaquin–soil concentration was 17.8 µmol kg^–1 with the 1.0 mL min^–1 flow rate and 20.0 µmol kg^–1 in the 0.67 and 0.33 mL min^–1 flow rates. All treatments were incubated for 72 h before desorption. Regression slopes are different at a 0.05 level of significance when indicated by ^a or ^b.