Registration Dossier
Registration Dossier
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EC number: - | 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
- Study period:
- 02.06.2010 - 04.08.2010
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Report date:
- 2010
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test)
- Version / remarks:
- Following OECD 301B resp. EU C.4.C
- GLP compliance:
- yes (incl. QA statement)
Test material
Reference
- Name:
- Unnamed
- Type:
- Constituent
Study design
- Oxygen conditions:
- anaerobic
- Inoculum or test system:
- activated sludge, domestic, non-adapted
- Details on inoculum:
- Activated sludge from a biologic sewage treatment plant was used. the chosen plant is treating mostly domestic sewage.
- Duration of test (contact time):
- 28 d
Initial test substance concentration
- Initial conc.:
- 26 mg/L
- Based on:
- test mat.
Parameter followed for biodegradation estimation
- Parameter followed for biodegradation estimation:
- CO2 evolution
Reference substance
- Reference substance:
- aniline
Results and discussion
% Degradation
- Key result
- Parameter:
- % degradation (CO2 evolution)
- Value:
- 60
- Sampling time:
- 28 d
- Details on results:
- The 10-day-window began on day 4, at its end, 53% were reached, missing the pass level of 60% given in the OECD guideline. Degradation surpassed 60% within 28 days, though. Therefore, the test item may be considered as "biodegradable within 28 days".
Abiiotic degradation was less than 2%.
Applicant's summary and conclusion
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- readily biodegradable, but failing 10-day window
- Conclusions:
- The test item Dicyclohexylammonium Isostearate (Isooctadecanoic acid, compound with dicyclohexylamine (1:1)) is considered as "biodegradable".
The degree of biodegradation reached 60% after 28 days.
The 10-day-window gegan on day 4, at its end, 53% were reached, missing the pass level of 60% given in the OECD guideline. Degradation surpassed 60% within 28 days, though. Therefore, the test item may be considered as "biodegradable within 28 days".
Abiiotic degradation was less than 2%.
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