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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:
- 2018
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 F (Ready Biodegradability: Manometric Respirometry Test)
- GLP compliance:
- yes (incl. QA statement)
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, non-adapted
- Duration of test (contact time):
- 28 d
- Initial conc.:
- 20 g/L
- Based on:
- test mat.
- Parameter followed for biodegradation estimation:
- O2 consumption
- Details on study design:
- None
- Preliminary study:
- No data
- Test performance:
- No data
- Key result
- Parameter:
- % degradation (CO2 evolution)
- Value:
- ca. 51.6
- Sampling time:
- 28 d
- Details on results:
During the test, three stages in the biodegradation of the test material are clearly visible:
- primary reactions up to day 3; these are manganese related processes.
- biodegradation phase from day 3 to day 6, i.e. oxidation of the organic part of the test material,
- nitrification of the test material from day 6 to day 28.
The given limits in days are indicative and there is probably no strict demarcation between the end of biodegradation and the start of nitrification. Both of these for a while processes occur side by side.
Biodegradation is the oxidation of organic carbon and other elements in an organic molecule.
Because the concentration of nitrites and nitrates was not determined for many test times (only for 14 and 28 days) the biodegradation of the test material in multiple cannot be calculated points. For this reason, the 10-day window principle was not applied.- Validity criteria fulfilled:
- yes
- Interpretation of results:
- inherently biodegradable
- Conclusions:
- Substance is inherently biodegradable.
Reference
Description of key information
Substnce is inherentlyb iodegradabe.
Key value for chemical safety assessment
- Biodegradation in water:
- inherently biodegradable
- Type of water:
- freshwater
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