Registration Dossier
Registration Dossier
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EC number: 241-318-1 | CAS number: 17283-81-7
Biodegradation in water: screening tests
Administrative data
- Endpoint:
- biodegradation in water: ready biodegradability
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- December 1997
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 997
- Report date:
- 1997
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
Test material
- Reference substance name:
- 4-(2,6,6-trimethyl-1-cyclohexen-1-yl)butan-2-one
- EC Number:
- 241-318-1
- EC Name:
- 4-(2,6,6-trimethyl-1-cyclohexen-1-yl)butan-2-one
- Cas Number:
- 17283-81-7
- Molecular formula:
- C13H22O
- IUPAC Name:
- 4-(2,6,6-trimethyl-1-cyclohexen-1-yl)butan-2-one
- Reference substance name:
- rel-4-((1R,6R)-2,2,6-trimethylcyclohexyl)butan-2-one
- Cas Number:
- 60761-23-1
- Molecular formula:
- C13H24O
- IUPAC Name:
- rel-4-((1R,6R)-2,2,6-trimethylcyclohexyl)butan-2-one
- Test material form:
- liquid
Constituent 1
impurity 1
Study design
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic, non-adapted
- Details on inoculum:
- Fresh activated sludge from a bioological waste water treatment plant treating predominantly domestic sewage (City of Geneva) was used.
- Duration of test (contact time):
- 28 d
Initial test substance concentrationopen allclose all
- Initial conc.:
- 100 mg/L
- Based on:
- test mat.
- Initial conc.:
- 100 mg/L
- Based on:
- other: reference substance
Results and discussion
% Degradationopen allclose all
- Key result
- Parameter:
- % degradation (O2 consumption)
- Value:
- 69
- Sampling time:
- 28 d
- Parameter:
- % degradation (O2 consumption)
- Value:
- 70
- Sampling time:
- 31 d
Applicant's summary and conclusion
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- readily biodegradable, but failing 10-day window
- Executive summary:
Dihydro Ionone Beta undergoes 70% biodegradation after 31 days (69% after 28 days) in the test conditions.
Biodegradation starts on day 6 and reaches 58% at the end of the 10 -day window (days 6 to 16). This is just below the pass level for the "ready" biodegradability qualification (60%).
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