Figure 1

Methodological approach of the present study. Aquatic toxicity data were obtained from regulatory data bases and the toxicity of the mixture was predicted by the concept of concentration addition (P _i denotes the relative proportion of the i th component in the mixture). The predicted toxicity of the mixture was compared to the toxicity of the product, resulting in the model deviation ratio, MDR. The calculations and comparisons were conducted separately within six different endpoints: acute toxicity to aquatic invertebrates and fish as well as growth inhibition of algae and water plants, always using EC₅₀ values; chronic toxicity to Daphnia and fish, using NOEC instead of EC₅₀ values. For detailed information refer to Methods section.