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EC number: 947-995-6 | CAS number: -
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
- Endpoint:
- biodegradation in water: ready biodegradability
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2014
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
- Version / remarks:
- Adopted 1992-07-17
- GLP compliance:
- yes
- Specific details on test material used for the study:
- SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: STO2697671
- Expiration date of the lot/batch: 2013-12-31
- - Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic (adaptation not specified)
- Details on inoculum:
- - Source of inoculum/activated sludge (e.g. location, sampling depth, contamination history, procedure): Datanasha Sewage Treatment Plant of Guangzhou
- Preparation of inoculum for exposure: washed by centrifugation, resuspended in mineral medium
- Concentration of sludge: 2.4 g dry material per liter - Duration of test (contact time):
- 28 d
- Initial conc.:
- 33 mg/L
- Based on:
- test mat.
- Parameter followed for biodegradation estimation:
- O2 consumption
- Details on study design:
- TEST CONDITIONS
- Test temperature: 22.1 - 22.7°C
- pH: 7.49 - 7.51
- Continuous darkness: yes
CONTROL AND BLANK SYSTEM
- Inoculum blank: 2 bottles
- Toxicity control: 1 bottle
- Other:
- Reference substance:
- benzoic acid, sodium salt
- Key result
- Parameter:
- % degradation (O2 consumption)
- Value:
- 69.3
- Sampling time:
- 28 d
- Parameter:
- % degradation (O2 consumption)
- Value:
- 46.5
- Sampling time:
- 14 d
- Details on results:
- Reference substance (14d): 88 % degradation (O2 consumption)
Toxicity control (14d): 55.8 % degradation (O2 consumption)
Test substance (14d): 48.5 % and 44.5 % degradation (O2 consumption)
Test substance 28d): 72.3 % and 66.2 % degradation (O2 consumption) - Parameter:
- COD
- Value:
- 1 680 mg O2/g test mat.
- Results with reference substance:
- Reference substance (14d): 88 % degradation (O2 consumption)
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- readily biodegradable, but failing 10-day window
- Conclusions:
- The percentage biodegradation of the test substance did not reach 60 % within the 10d-window of the test under the conditions of the study. However, 69.3 % degradation was reached at day 28.
Reference
Description of key information
The percentage biodegradation of the test substance did not reached 60 % at the 10d-window of the test under the conditions of the study. However, 69.3 % degradation was reached at day 28.
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable but failing 10-day window
Additional information
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