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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

3h-EC50 > 20 mg/L

Key value for chemical safety assessment

EC50 for microorganisms:
20 mg/L

Additional information

The key study assesses the effect of DAPD (Polystay 100) on the respiration rate of activated sludge micro-organisms. The test method is based on OECD test guideline 209 and uses freshly obtained activated sludge from a mainly domestic sewage treatment plant. DAPD is added to the test vessels at 0.2, 2 and 20 mg/L. No dose-response effect on the inhibition of the respiration rate of activated sludge was observed. The 3h-EC50 of DAPD therefore was concluded to be > 20 mg/L.

In the supporting study higher concentrations of DAPD (up to 10000 mg/L) were tested according to the OECD 209 test protocol. Also in this case no substantial toxicity towards micro-organisms was observed.