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EC number: 467-100-8 | 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:
- 16 January 2018 - 11 July 2018
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 310 (Ready Biodegradability - CO2 in Sealed Vessels (Headspace Test)
- Version / remarks:
- September 2014
- GLP compliance:
- yes (incl. QA statement)
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic, non-adapted
- Details on inoculum:
- source: municipal wastewater treatment plant Breisgauer Bucht
concentration: 4 mg dry solids (d.s.) per litre
sampling data: 17 January 2018
dry solid content of activated sludge: 3.8 g/l (triplicate measurements)
the activated sludge was washed twice with tape water by settling the sludge, decanting the supernatant an re-suspending the sludge. In order to keep the tIC of the blank at a low level, the activated sludge was pre- - Duration of test (contact time):
- 28 d
- Initial conc.:
- 2.9 µg/L
- Based on:
- test mat.
- Initial conc.:
- 20 mg/L
- Based on:
- TOC
- Parameter followed for biodegradation estimation:
- CO2 evolution
- Reference substance:
- benzoic acid, sodium salt
- Key result
- Parameter:
- % degradation (CO2 evolution)
- Value:
- 86.4
- St. dev.:
- 11
- Sampling time:
- 7 d
- Key result
- Parameter:
- % degradation (CO2 evolution)
- Value:
- 93.4
- St. dev.:
- 12.7
- Sampling time:
- 14 d
- Key result
- Parameter:
- % degradation (CO2 evolution)
- Value:
- 89.6
- St. dev.:
- 9.3
- Sampling time:
- 21 d
- Key result
- Parameter:
- % degradation (CO2 evolution)
- Value:
- 83.4
- St. dev.:
- 12.1
- Sampling time:
- 28 d
- Details on results:
- Toxicity control: The degradation extend in the toxicity control was 79% within 14 days. The test substance had no inhibitory effect on the inoculum.
Reference item: The reference substance sodium benzoate reached the pass level for ready biodegradability within 7 days (80.6%) - Validity criteria fulfilled:
- yes
- Interpretation of results:
- readily biodegradable
- Conclusions:
- Under the test conditions the substance was ready biodegradable
- Executive summary:
In an valid OECD 310, CO2 Headspace, Test under GLP the test substance was ready biodegradable.
Reference
Description of key information
In an valid OECD 310, CO2 Headspace Test under GLP the test substance is ready biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
- Type of water:
- freshwater
Additional information
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