Figure 5.

Extracellular microcystin (MC) concentrations (μg L⁻¹) of three MC variants quantified in samples from P. rubescens suspensions from (a) Lake De Kuil and (b) Lake Rauwbraken after 24 h exposure to hydrogen peroxide (5 mg L⁻¹), peroxide + coagulant (2 mg Al L⁻¹) and ballast (200 mg LMB L⁻¹) (combined) or only coagulant (2 mg Al L⁻¹) and LMB (Floc & Lock). Error bars indicate 1 SD (n = 3). Similar letters indicate homogeneous groups that are not different at the p < 0.05 level.