Registration Dossier
Registration Dossier
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EC number: 424-190-3 | CAS number: 105641-66-5 DIAZO ER 1273
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:
- 5. June to 3. July, 1992
- 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:
- no
- GLP compliance:
- yes
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic, non-adapted
- Details on inoculum:
- - Source of inoculum/activated sludge: domestic sewage treatment plant Frankfurt Sindlingen, Germany
- Concentration of sludge: 10 ml/L - Duration of test (contact time):
- 28 d
- Initial conc.:
- 60.9 mg/L
- Based on:
- test mat.
- Remarks:
- 39.65 mg as carbon
- Initial conc.:
- 32.6 mg/L
- Based on:
- test mat.
- Remarks:
- 21.22 mg as carbon
- Parameter followed for biodegradation estimation:
- CO2 evolution
- Details on study design:
- The test substance was directly weighed into the test vessels (5L glass vessels)
- Reference substance:
- benzoic acid, sodium salt
- Key result
- Parameter:
- % degradation (CO2 evolution)
- Value:
- < 20
- Sampling time:
- 28 d
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- not readily biodegradable
- Conclusions:
- The test substance was found to be not readily biodegradable.
- Executive summary:
The testing according to the modified Sturm test (OECD Guideline 301 B) revealed that the test item was not readily biodegradable. Within a period of 28 days the CO2 formation stayed below 20 % of the theoretical maximum.
Reference
The degradation of the reference substance caused CO2-formation amounting to more than 60 % of the theoretical maximum within 10 days.
Description of key information
The testing according to the modified Sturm test (OECD Guideline 301 B) revealed that the test item was not readily biodegradable. Within a period of 28 days the CO2 formation stayed below 20 % of the theoretical maximum.
Key value for chemical safety assessment
- Biodegradation in water:
- not biodegradable
- Type of water:
- freshwater
Additional information
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