Fig. 5. Influence of flow rate and effluent on ratio of solution concentration to soil concentration (nonequilibrium Kd). Initial imazaquin–soil concentration was 17.8 µmol kg–1 in the 1.0 mL min–1 flow rate and 20.0 in the 0.67 and 0.33 mL min–1 flow rates. All treatments were incubated 72 h before desorption. Regression slopes were not different at the 0.05 level of significance.