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EC number: 212-161-6
CAS number: 766-09-6
The inhibition of the degradation activity of activated sludge is not anticipated when introduced in appropriately low concentrations.
Three short-term respiration inhibition
tests according to ISO 8192B were performed using activated sludge from
an industrial wwtp instead of activated sludge from a wwtp treating
predominantly domestic sewage. The exposure duration was 30 minutes. The
following effect values were determined for 1 -ethylpiperidine (CAS 766
30 -min EC20: > 500 mg/L (BASF AG, 1988; 05
180 -min EC20: > 100, < 500 mg/L (BASF AG,
1988; 05 Feb 1988)
30 -min EC20: > 1510 mg/L (BASF AG, 1988; 04
30 -min EC20: > 1510 mg/L (BASF AG, 1988; 26
30 -min EC10: ca. 500 mg/L (BASF AG, 1988;
26 Jan 1988)
It can be concluded that the EC20 is
significantly greater than 100 mg/L.
Since the respiration inhibition test with 1 -ethylpiperidine
were performed with activated sludge from an industrial wwtp, experimental
data from the structurally similar substance 1 -Methylpiperidine (CAS
626 -67 -5) were used to support the assessment and to derive the PNEC_STP.
Two short-term respiration inhibition tests
were performed according to the OECD Guideline 209 (Activated sludge,
Respiration Inhibition Test) using activated from a wwtp treating
predominantly domestic sewage. The effect values were as follows:
- 30 -min EC20: > 996 mg/L (BASF AG,
- 30 -min EC10: > 1000 mg/L (BASF AG,
- 30 -min NOEC: 1000 mg/L (BASF AG, 1991;
In conclusion, the inhibition of the
degradation activity of activated sludge is not anticipated when
1-ethylpiperidine is introduced in appropriately low concentrations.
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