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EC number: 273-227-8
CAS number: 68953-84-4
3h-EC50 > 20 mg/L
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.
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