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EC number: 452-830-1 | CAS number: -
Biodegradation in water: screening tests
Administrative data
- 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
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 010
- Report date:
- 2010
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 A (Ready Biodegradability: DOC Die Away Test)
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.4-C (Determination of the "Ready" Biodegradability - Carbon Dioxide Evolution Test)
- Qualifier:
- according to guideline
- Guideline:
- ISO DIS 9439 (Ultimate Aerobic Biodegradability - Method by Analysis of Released Carbon Dioxide)
- Version / remarks:
- dd. 1999
- GLP compliance:
- yes
Test material
- Reference substance name:
- -
- EC Number:
- 452-830-1
- EC Name:
- -
- Molecular formula:
- C27 H44 N2 Na2 O6 S3
- IUPAC Name:
- Equimolecular mixture of - Disodium 2-Hexadecylsulfanyl-1-(4-sulfo-butyl)-1H- benzoimidazole-5-sulfonate - Disodium 2-Hexadecylsulfanyl-3-(4-sulfo-butyl)-1H- benzoimidazole-5-sulfonate
Constituent 1
Study design
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic (adaptation not specified)
- Details on inoculum:
- Activated sludge freshly obtained from a municipal sewage treatment plant: 'Waterschap Aa en Maas', 's-Hertogenbosch, The Netherlands, receiving predominantly domestic sewage
- Duration of test (contact time):
- 28 d
Initial test substance concentration
- Initial conc.:
- 23.5 mg/L
- Based on:
- other: TOC=12mg/l
Parameter followed for biodegradation estimation
- Parameter followed for biodegradation estimation:
- CO2 evolution
Reference substance
- Reference substance:
- acetic acid, sodium salt
Results and discussion
% Degradationopen allclose all
- Parameter:
- % degradation (CO2 evolution)
- Remarks:
- [ratio between cumulative CO2 produced and the total expected CD2 production based on the total carbon content of the amount of test substance (87.7mg CO2/2l)]
- Value:
- 31
- Sampling time:
- 28 d
- Remarks on result:
- other: bottle A
- Parameter:
- % degradation (CO2 evolution)
- Remarks:
- [ratio between cumulative CO2 produced and the total expected CD2 production based on the total carbon content of the amount of test substance (87.7mg CO2/2l)]
- Value:
- 15
- Remarks on result:
- other: bottle B
- Details on results:
- The substance was found not to inhibit microbial activity.
Applicant's summary and conclusion
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- not readily biodegradable
- Conclusions:
- The substance was not readily biodegradable under the conditions of the modified Sturm test presently performed.
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