Registration Dossier
Registration Dossier
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EC number: 202-374-2 | CAS number: 94-91-7
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
- Endpoint:
- biodegradation in water: ready biodegradability
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 1999
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
- GLP compliance:
- yes
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic, non-adapted
- Details on inoculum:
- - Municipal activated sludge from laboratory wastewater treatment plants fed with municipal sewage
- Concentration of dry substance 30 mg/L - Duration of test (contact time):
- 28 d
- Initial conc.:
- 100 mg/L
- Based on:
- test mat.
- Parameter followed for biodegradation estimation:
- O2 consumption
- Reference substance:
- aniline
- Key result
- Parameter:
- % degradation (O2 consumption)
- Value:
- >= 70 - <= 80
- Sampling time:
- 28 d
- Details on results:
- - Duration of adaptation phase (d): 2
- Duration of degradation phase (d): 18
- Degradation at end of ten-day window (% BOD/ThOD): 60 - 70
- Degree of degradation of test substance in abiotic control at end of test (%BOD/ThOD): 0 - 10
Kinetic of test substance (in %):
= 0 after 1 day(s)
= 16 after 2 day(s)
= 52 after 3 day(s)
= 64 after 14 day(s)
= 68 after 21 day(s)
= 75 after 28 day(s)
Kinetic of control substance (in %):
= 60 ... 70 after 14 day(s) - Key result
- Parameter:
- BOD5*100/ThOD
- Value:
- 60 - 70
- Results with reference substance:
- - Degradation degree of reference substance after 14 days (%BOD/ThOD): 60 - 70
- Degradation degree in inhibition control after 14 days (%BOD/ThOD): 60 - 70 - Validity criteria fulfilled:
- yes
- Interpretation of results:
- readily biodegradable
- Conclusions:
- The biodegradation rate was determined by measuring the oxygen consumption of non-adapted domestic activated sludge at a concentration of 100 mg/l. After the 28 day incubation period, a degradation rate of 70 -80% was observed.
Reference
Description of key information
The ready biodegradability of the substance was tested in a GLP guideline study according to OECD 301F (Ready biodegradability: Manometric Respirometry Test).
The biodegradation rate was determined by measuring the oxygen consumption of non-adapted domestic activated sludge at a concentration of 100 mg/l. After the 28 day incubation period, a degradation rate of 70 -80% was observed.
The substance is therefore considered to be readily biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
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