exceeded 100 mg/L; for the 2-d pulse scenario the EC50 was
lower, at 97 mg/L (Table 3). Inhibition of Lemna minor growth rate
under pulsed and continuous exposure scenarios is summarized
in Figure 2. There were no significant differences in Lemna minor
growth rate between the control and the different exposure
scenarios ( p>0.0021) at treatment concentrations of 5 and
25 mg/L. At 50 mg/L, Lemna minor growth rate under the 2-d pulse
exposure scenario was not significantly different from the
control ( p=0.069); however, continuous and 4-d pulse application
scenarios resulted in significantly reduced growth
(p