Registration Dossier
Registration Dossier
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EC number: 223-496-2 | CAS number: 3923-79-3
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
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 A (Ready Biodegradability: DOC Die Away Test)
- GLP compliance:
- yes
- 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): Activated sludge from a laboratory wastewater treatment plants fed with municipal and synthetic sewage
- Concentration of sludge: 30 mg/L - Duration of test (contact time):
- 28 d
- Initial conc.:
- 20 mg/L
- Based on:
- DOC
- Initial conc.:
- 109 mg/L
- Based on:
- test mat.
- Details on study design:
- TEST CONDITIONS
- Composition of medium: 500 mL destilled water, 13 mL nutrient solution, 5 mL inoculum, 51 mL stock solution test substance, filled up with distilled water to a total volume of 1000 mL.
TEST SYSTEM
- Culturing apparatus: Shimadzu TOC 500
- Number of culture flasks/concentration: 2
CONTROL AND BLANK SYSTEM
- Inoculum blank: yes
- Abiotic sterile control: yes
- Toxicity control: yes - Reference substance:
- benzoic acid, sodium salt
- Key result
- Parameter:
- % degradation (DOC removal)
- Value:
- >= 70 - <= 80
- Sampling time:
- 28 d
- Interpretation of results:
- readily biodegradable, but failing 10-day window
Reference
Description of key information
In a study according to OECD guideline 301, the test substance was readily biodegradable, but failed the 10-d window.
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable but failing 10-day window
- Type of water:
- freshwater
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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