fig4

Figure 4. Influence of municipal wastewater extracts on the PER assay. The Perotox assay was used to determine the potential toxic properties of municipal influents and effluents (A). The formation rate of CIII (B; 418 nm) and the levels of aldehydes (C; TBARS) were determined. The control represents the PER assay in the presence of the vehicle (ethanol). The data are expressed as the mean with the standard error. The star symbol * indicates significance relative to controls. PER: Peroxidase; Perotox: peroxidase-toxicity; TBARS: thiobarbituric acid reactants (malonaldehyde).