Fig. 3. Variation of toxicity in time for the decoloration of 2000 mg L^–1 Amaranth by Trametes versicolor. Toxicity assays performed on samples with their original pH (a) and on pH adjusted to be between 6 and 8 (b). Toxicity calculated for the 50% effect and 15-min exposure time (TU_{50, 15 min}) as 100/EC₅₀. CC = chemical components. Three measurements/mean and 95% confidence level.