Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

An acute toxicity package characterizing MBTC effects is available.

For fish test the analytical methodology used a derivatisation procedure. Therefore it is difficult to attribute the observed toxicity to MBTC or other degradation products. Nevertheless even in this context, the observed toxicity is very low and far above the expected water solubility: Fish --> LC50-96h > 100 mg/L.Therefore no effects observed up to the water solubility limit of MBTC.

For Daphnia and algae, the same procedure was applied but with different results for algae. For Daphnia the situation is the same as for fish. The observed toxicity is very low and far above the expected water solubility: Daphnia --> EC50-48h = 83 mg/L.Therefore no effects observed up to the water solubility limit of MBTC.

For algae, the figures obtained are very low, below 1 mg/L, concentration at which we can expect to have a certain quantity of MBTC solubilized. On the other hand the observed toxicity could also come from degradation products but we do not have sufficient elements for demonstrating this. Nevertheless based on the existing data and considering possible occurrence of MBTC at very low concentration in water, toxicity figures are retained for classification purpose:

Algae --> ErC50-72h = 0.31 mg/L