Registration Dossier
Registration Dossier
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EC number: 201-708-4 | CAS number: 86-92-0
Biodegradation in water: screening tests
Administrative data
- Endpoint:
- biodegradation in water: inherent biodegradability
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 1988
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: according to Zahn-Wellens test (only test results reported)
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 988
- Report date:
- 1988
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.9 (Biodegradation: Zahn-Wellens Test)
- GLP compliance:
- not specified
Test material
- Reference substance name:
- 3-methyl-1-p-tolyl-5-pyrazolone
- EC Number:
- 201-708-4
- EC Name:
- 3-methyl-1-p-tolyl-5-pyrazolone
- Cas Number:
- 86-92-0
- Molecular formula:
- C11H12N2O
- IUPAC Name:
- 3-methyl-1-p-tolyl-5-pyrazolone
Constituent 1
Study design
- Oxygen conditions:
- not specified
- Inoculum or test system:
- not specified
- Details on inoculum:
- no further detailed information reported about inoculum used for this Zahn Wellens test
- Duration of test (contact time):
- 28 d
Initial test substance concentrationopen allclose all
- Initial conc.:
- 394 other: mgC/L
- Based on:
- DOC
- Initial conc.:
- 1 542 other: mgO2/L
- Based on:
- COD
Reference substance
- Reference substance:
- not specified
Results and discussion
% Degradationopen allclose all
- Parameter:
- % degradation (DOC removal)
- Value:
- 0
- Sampling time:
- 3 h
- Parameter:
- % degradation (DOC removal)
- Value:
- 5
- Sampling time:
- 5 d
- Parameter:
- % degradation (DOC removal)
- Value:
- 0
- Sampling time:
- 10 d
- Parameter:
- % degradation (DOC removal)
- Value:
- 8
- Sampling time:
- 15 d
- Parameter:
- % degradation (DOC removal)
- Value:
- 30
- Sampling time:
- 28 d
Applicant's summary and conclusion
- Validity criteria fulfilled:
- not specified
- Interpretation of results:
- other: hardly to moderately biodegradable
- Conclusions:
- The tested substance is hardly to moderately biodegradable.
- Executive summary:
A biodegradation range of 30 -70% is possible since after 15d of adaption a clear biodegradation started; biodegradation could possibly be higher if the test was based on an adapted inoculum
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