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Ecotoxicological information

Toxicity to microorganisms

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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

An activated sludge test has been conducted on tetrahydromethylphthalic anhydride (MTHPA), of which 3 -MTHPA D4 is an isomer following OECD test methds. An EC50 value of 69.87 mg/L was determined. An accurate NOEC value could not be determined, being lower than the lowest concentration of 10 mg/L investigated. Respiration rates were influenced (inhibited) dose dependently over the whole concentration range.