Registration Dossier
Registration Dossier
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EC number: 259-830-9 | CAS number: 55809-98-8
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
- Endpoint:
- biodegradation in water: screening tests
- Type of information:
- other: read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Study period:
- May 05, 1981
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Basic data given, acceptable for assessment
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- No information about the method used.
- GLP compliance:
- no
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- not specified
- Details on inoculum:
- None
- Details on study design:
- None
- Preliminary study:
- None
- Test performance:
- None
- Remarks on result:
- other: Not determinable, BOD5/COD test
- Details on results:
- None
- Parameter:
- BOD5
- Value:
- ca. 0 mg O2/g test mat.
- Parameter:
- COD
- Value:
- ca. 675 mg O2/g test mat.
- Parameter:
- BOD5*100/COD
- Value:
- ca. 0
- Results with reference substance:
- None
- Interpretation of results:
- not readily biodegradable
- Conclusions:
- BOD5/COD = 0
- Executive summary:
The BOD5 and the COD of the test substance are determined by measuring the dissolved oxygen concentration before and after 5 days incubation at 20 °C in different test concentrations diluted in water saturated with dissolved oxygen that contains a seed of micro-organisms.
The BOD5/COD of the test substance is 0.
Reference
None
Description of key information
Not readily biodegradable.
Key value for chemical safety assessment
Additional information
No studies on the "Biodegradation in water" are available for the substance in itself.
Nevertheless studies were conducted with an analogue molecule (Similar Substance 01). Further information are reported in the Read Across justification attached to section 13.
The first study was carried out to determine the ready biodegradation of the test substance. The biochemical oxygen demand was determined by measuring the dissolved oxygen concentration before and after 5 days incubation at 20 °C in different test concentrations diluted in water saturated with dissolved oxygen that contains a seed of micro-organisms. The BOD5 and COD of the test substance was found to be 0 mg O2/g and 675 mg O2/g, respectively. In another study, the values were as follows: BOD5 = 2.8 mg/g O2, COD = 335.34 mg/g O2 (BOD5/COD = 0.085).
Relevant is the BOD5/COD quotient which is not > 0.5, therefore the substance is not indicative of rapid degradation. Taking into consideration the data from the two studies, the test substance can be regarded as not readily biodegradable.
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