Registration Dossier
Registration Dossier
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EC number: 268-750-3 | CAS number: 68134-38-3
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
- Endpoint:
- biodegradation in water: ready biodegradability
- Type of information:
- calculation (if not (Q)SAR)
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- accepted calculation method
- Qualifier:
- according to guideline
- Guideline:
- other: expert judgement
- Version / remarks:
- expert judgement based on estimation and available data
- Deviations:
- not applicable
- GLP compliance:
- no
- Inoculum or test system:
- not specified
- Parameter:
- other: expert judgement based on available studies
- Remarks on result:
- other: not determined
- Validity criteria fulfilled:
- not applicable
- Interpretation of results:
- not readily biodegradable
- Conclusions:
- Based on available studies, the tested substance is considered to be not ready biodegradable.
- Executive summary:
Based on available studies, the tested substance is considered to be not ready biodegradable.
- Endpoint:
- biodegradation in water: screening test, other
- Remarks:
- inherent biodegradability
- Type of information:
- other: experimental study based on similar substance
- Adequacy of study:
- key study
- Study period:
- 1995-01-16 to 1995-02-13
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Guideline study, well documented.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 302 B (Inherent biodegradability: Zahn-Wellens/EMPA Test)
- GLP compliance:
- no
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge (adaptation not specified)
- Details on inoculum:
- - Test organisms: aquatic mix-population of activated sludge- Source of inoculum: Activated sludge I: municipal ("Kläranlage im Labormaßstab, die mit kommunalen Abwasser betrieben wird (Wupperverband)") Activated sludge II: predominantly municipal ("Kläranlage Odenthal, wird vorwiegend mit kommunalem Abwasser betrieben.") Activated sludge III: predominantly industrial ("Belebungsbecken des Gemeinschaftsklärwerks Bürrig wird vorwiegend mit industriellem Abwasser betrieben.")- Pretreatment: each sludge was washed twice, and separated via centrifugation
- Duration of test (contact time):
- ca. 28 d
- Initial conc.:
- ca. 100 mg/L
- Based on:
- DOC
- Parameter followed for biodegradation estimation:
- DOC removal
- Reference substance:
- aniline
- Parameter:
- % degradation (DOC removal)
- Value:
- ca. 1
- Sampling time:
- 28 d
- Remarks on result:
- other: Activated sludge I - municipal
- Parameter:
- % degradation (DOC removal)
- Value:
- ca. 2
- Sampling time:
- 28 d
- Remarks on result:
- other: Activated sludge II - predominantly municipal
- Parameter:
- % degradation (DOC removal)
- Value:
- ca. 6
- Sampling time:
- 28 d
- Remarks on result:
- other: Activated sludge III - predominantly industrial
- Results with reference substance:
- 100% biodegradation after 14 days with each sludge type.
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- not inherently biodegradable
- Conclusions:
- The test substance was tested for inherent biodegradation in a modified Zahn-Wellens test according to OECD 302B. The DOC-removal with three different sludge types was consistently below 10% after 28 days suggesting that the test substance has to be considered as "not inherently biodegradable".
- Executive summary:
The test substance was tested for inherent biodegradation in a modified Zahn-Wellens test according to OECD 302B. A significant biological degradation was not noted. The DOC-removal with three different sludge types was consistently below 10% after 28 days.
Referenceopen allclose all
Description of key information
The test substance was tested for inherent biodegradation in a modified Zahn-Wellens test according to OECD 302B. A significant biological degradation was not noted. The DOC-removal with three different sludge types was consistently below 10% after 28 days.
The EPIWEB estimation showed no readily biodegradation.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
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