Registration Dossier
Registration Dossier
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
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
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
