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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

Toxicity to microorganisms: EC50 = 219 mg/L

Key value for chemical safety assessment

EC50 for microorganisms:
219 mg/L
EC10 or NOEC for microorganisms:
70 mg/L

Additional information

Toxicity to microorganisms has been investigated in an activated sludge respiration inhibition test according to OECD test methods. 4 –MHHPA caused a concentration related inhibition ranging from 14% at 58 mg/L to 99% at 1000 mg/L. The EC50 was 219 (189 – 248) mg/L with concentrations of 95.3 mg/L and below causing less that 20% inhibition and regarded as not toxic to microorganisms of a municipal sewage treatment plant. EC10, estimated from reported EC20, EC50 and EC80 values, was approximately 70 mg/L. Effects or pH on inhibition were examined and found to be the major factor in determining effects, a concentration of 1000 mg/L causing <20% inhibition when pH was adjusted back to neutral.