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EC number: 941-899-8 | CAS number: -
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
- Endpoint:
- biodegradation in water: inherent biodegradability
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 1993
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Justification for type of information:
- None
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 302 B (Inherent biodegradability: Zahn-Wellens/EMPA Test)
- Deviations:
- no
- Principles of method if other than guideline:
- Guideline followed
- GLP compliance:
- yes (incl. QA statement)
- Specific details on test material used for the study:
- None
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- sewage, domestic (adaptation not specified)
- Details on inoculum:
- - Source of inoculum/activated sludge (e.g. location, sampling depth, contamination history, procedure): Sludge of a biological sewage treatment plant (ARA-Therwil) collected on 22.06.93
- Duration of test (contact time):
- 28 d
- Initial conc.:
- 150 mg/L
- Based on:
- DOC
- Parameter followed for biodegradation estimation:
- DOC removal
- Details on study design:
- Experimental conditions:
Water/Nutrient: according to the specification of the EEC L133 (pp. 99-105) Volume 31 resp. OECD Method 302B.
Temperature: 22.0 ± 3°C (room temperature)
Test duration: 28 days
Lighting: indirect daylight
Estimation Technique: TOC/DOC Analyzer/ SHIMADZU TOC-500 - Reference substance:
- diethylene glycol
- Preliminary study:
- None
- Test performance:
- None
- Key result
- Parameter:
- % degradation (DOC removal)
- Value:
- 4
- Sampling time:
- 28 d
- Details on results:
- Test substance:
The bioelimination of FAT - 92'348/A measured as DOC after 28 days corrected by the blank control is: 4.0 % (average of 2 tests running in parallel)
Adsorption after 3 hours: 3.6 %
Reference substance:
The bioelimination, corrected by the blank control and measured as DOC (mg/l) is: 98.7 % 16th day - Results with reference substance:
- The bioelimination, corrected by the blank control and measured as DOC (mg/l) was: 98.7 % on 16th day.
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- not inherently biodegradable
- Conclusions:
- The bioelimination of the test substance FAT - 92348/A after 28 days was: 4.0 %.
- Executive summary:
The inherent biodegradability of FAT - 92348/A was determined in a 28 days Zahn-Wellens Test according to the OECD Guideline for Testing of Chemicals, No. 302B, Paris 1981 and the EEC-Directive, L133 (pp. 99-105) Volume 31, May 88, in accordance with GLP.
The test substance was tested in concentration of 150 mg/l DOC. The reference substance diethylene glycol was also tested in a concentration of 150 mg/l DOC.
The bioelimination of the test substance FAT - 92'348/A after 28 days was: 4.0 %, while the bioelimination of the reference substance after 16 days was: 98.7 %.
Reference
None
Description of key information
FAT 92348/A is neither readily nor inherently biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
In the key study, the inherent biodegradability of FAT - 92348/A was determined in a 28-day Zahn-Wellens - Test according to the OECD Guideline for Testing of Chemicals, No. 302B, Paris 1981 and the EEC-Directive, L133 (pp. 99-105) Volume 31, May 88, in accordance with GLP. The test substance was tested in concentration of 150 mg/l DOC. The reference substance Diethylenglycol was also tested in a concentration of 150 mg/l DOC. Based on the findings of the study, the bioelimination of the test substance FAT 92348/A after 28 days was estimated to be 4.0 %, while the bioelimination of the reference substance after 16 days was 98.7 %.
In two separately conducted studies in 1993, the Biological Oxygen Demand (BOD5) of FAT - 92348/A over a duration of 5 days was estimated to be 8 mg 02/g, while the COD of determined to be 855 mg O2/g. Hence, the BOD5/COD ratio was calculated to be 8/855 = 0.009, which indicates substance to be not rapidly biodegradable.
For FAT 40065/A (1974), BOD5 was found to be 56 mg/g O2 and COD was found to be 817 mg/g O2. Correspondingly the BOD5/COD quotient is calculated to 0.069 at pH= 4.8. The substance is considered to be not rapidly biodegradable.
Hence all the available data point to the substance being neither readily nor inherently biodegradable.
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