Registration Dossier

Ecotoxicological information

Toxicity to microorganisms

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

The EC50 value was determined as 69.87 mg/L.

Key value for chemical safety assessment

EC50 for microorganisms:
69.87 mg/L

Additional information

In an activated sludge test with tetrahydromethylphthalic anhydride (MTHPA) an EC50 value was determined as 69.87 mg/L.

An accurate NOEC value was not determined. The NOEC was lower than the investigated lowest concentration level of 10 mg/L.

The respiration rates were inhibited and influenced dose dependently in the whole concentration range, the observed inhibition (17.6 %) at the lowest examined concentration level of 10 mg/L was evaluated as an unequivocal effect caused by the test item.