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EC number: 211-748-4 | CAS number: 693-33-4
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:
- 29 days
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)
- Deviations:
- yes
- Remarks:
- Due to a batch of defective soda-lime, the CO2 trap sequence was changed from 2 soda-lime traps to 2 soda-lime traps followed by 2 500ml dreschels of 3M NaOH and 1 dreschel of Maxima H2O to act as a caustic vapour trap on 30/03/17 (day 1).
- GLP compliance:
- yes
- Specific details on test material used for the study:
- Identification: ColaTeric COAB
Lot/batch number: 53610J16
Supplied by: Colonial Chemical, Inc
Homogeneity (supplied): Homogeneous
Homogeneity (observed): Homogeneous
Date of receipt: 12th December 2016
Expiry date: 19-10-2018 - Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge (adaptation not specified)
- Details on inoculum:
- Source: Cambridge Sewage Treatment Works, Cowley Road
Date of collection: 28/03/17 - Duration of test (contact time):
- 28 d
- Initial conc.:
- 15 mg/L
- Based on:
- DOC
- Initial conc.:
- 20 mg/L
- Based on:
- DOC
- Parameter followed for biodegradation estimation:
- CO2 evolution
- Reference substance:
- acetic acid, sodium salt
- Key result
- Parameter:
- % degradation (CO2 evolution)
- Value:
- 72
- Sampling time:
- 9 d
- Key result
- Parameter:
- % degradation (CO2 evolution)
- Value:
- 110
- Sampling time:
- 29 d
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- readily biodegradable
Reference
ColaTeric COAB achieved significant degradation in this test (60% degradation relative to the ThCO2 value) with a maximum of 110% degradation recorded on day 29. It may therefore, be concluded that there is a potential for biodegradation under environmental conditions.
The test protocol also requires that a 10 day window is applied to the degradation results (60% degradation to be reached within 10 days of 10% of the theoretical carbon dioxide produced).
10% degradation was achieved at approximately 2 day and 60% was reached at approximately day 7, ColaTeric COAB therefore achieved the 10-day window and a pass according to the guideline.
The final conclusion of this study is therefore that ColaTeric COAB is readily biodegradable in an aerobic aqueous environment
Description of key information
Cetyl betaine achieved significant degradation in this test (60% degradation relative to the ThCO2 value) with a maximum of 110% degradation recorded on day 29. It may therefore, be concluded that there is a potential for biodegradation under environmental conditions.
The test protocol also requires that a 10 day window is applied to the degradation results (60% degradation to be reached within 10 days of 10% of the theoretical carbon dioxide produced).
10% degradation was achieved at approximately 2 day and 60% was reached at approximately day 7, ColaTeric COAB therefore achieved the 10-day window and a pass according to the guideline.
The final conclusion of this study is therefore that cetyl betaine is readily biodegradable in an aerobic aqueous environment
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
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