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EC number: 243-632-4 | CAS number: 20241-76-3
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
- Endpoint:
- biodegradation in water: inherent biodegradability
- Remarks:
- Zahn Wellens: Biodegradation in water
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 17 March 1987
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study with acceptable restrictions
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 302 B (Inherent biodegradability: Zahn-Wellens/EMPA Test)
- Version / remarks:
- According to CIBA's in-house SOP method A-37
- Deviations:
- not specified
- GLP compliance:
- no
- Specific details on test material used for the study:
- FAT 40278/A
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge (adaptation not specified)
- Details on inoculum:
- Activated sludge should be taken from a municipal waste-water treatment plant which has been rinsed with municipal water for 2 times. The sediment is taken to estimate the dry weight according to method A-26. The activated sludge is prepared one day before the start of the experiment, ventilated overnight and adjusted to a concentration of 600 mg/L.
- Duration of test (contact time):
- 28 d
- Key result
- Parameter:
- % degradation (TOC removal)
- Value:
- 49
- Sampling time:
- 28 d
- Validity criteria fulfilled:
- not specified
- Interpretation of results:
- inherently biodegradable, fulfilling specific criteria
- Conclusions:
- FAT 40278/A is inherently biodegradable
- Executive summary:
In a study performed according to the Zahn-Wellens test procedure which is similar to OECD guideline 302 B, FAT 40278/A was assessed for biodegradation potential at the end of the 28-day experimental period. The initial test substance concentration was 145 mg/l TOC. At the end of 28 days 49 % TOC was observed, indicating the test substance FAT 40278/A is inherently biodegradable.
Reference
Description of key information
In a study performed as per Zahn-Wellen test procedure which is similar to OECD guideline 302 B, FAT 40278/A was assessed for biodegradation potential at the end of the 28 day experimental period. The initial test substance concentration was 145 mg/l TOC. At the end of 28 days 49 % TOC was observed, indicating the test substance FAT 40278/A as inherently biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- inherently biodegradable
Additional information
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