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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to microorganisms

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Administrative data

Link to relevant study record(s)

Description of key information

Toxicity to micro-organisms: EC50 13,4 mg/l , EC10 3,34 mg/l, NOEC 1 mg/l (OECD 209) 

Key value for chemical safety assessment

EC50 for microorganisms:
13.4 mg/L
EC10 or NOEC for microorganisms:
3.34 mg/L

Additional information

Microbiological respiration inhibition data is provided on p-Phenylenediamine in activated sludge of a municipal WWTP. The 3 -hr NOEC was 1 mg/l. The 3 -hr EC10 was 3.34 mg/l, the 3-hr EC50 was 13.4 mg/l and the 3 -hr EC80 was > 100 mg/l. Supporting data is provided from p-phenylenediamine in activated sludge of predominanly industrial sewage. A 30% reduction in respiration rate (30 min): 100 mg/L (nominal) based on respiration rate was observed.