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EC number: 213-214-6 | CAS number: 930-33-6
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:
- weight of evidence
- Study period:
- August- October 2006
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 306 (Biodegradability in Seawater)
- Deviations:
- yes
- Remarks:
- nitrite and nitrate concentrations were not measured
- GLP compliance:
- yes (incl. QA statement)
- Specific details on test material used for the study:
- Test substance: Triazolone
CAS#: 930-33-6
Stability: stable
Solubility: soluble in seawater
Appearance: white solid, powder with no odour
Date received: 01.09.2006
Storage: 20°C - Oxygen conditions:
- aerobic
- Inoculum or test system:
- natural water: marine
- Details on inoculum:
- NA
- Duration of test (contact time):
- ca. 28 d
- Initial conc.:
- ca. 2.04 mg/L
- Based on:
- ThOD
- Parameter followed for biodegradation estimation:
- O2 consumption
- Details on study design:
- Test substance (2-10 mg per litre) was added directly to the test medium and mixed on a magnetic stirrer, for at least 15 min.
The closed bottles were incubated in the dark at 20.0°C +/- 1.4 for 28 d. - Reference substance:
- benzoic acid, sodium salt
- Parameter:
- % degradation (test mat. analysis)
- Value:
- ca. 1
- Sampling time:
- 7 d
- Key result
- Parameter:
- % degradation (O2 consumption)
- Value:
- ca. 3
- Sampling time:
- 28 d
- Details on results:
- The test substance was degraded by 3% after 28 days.
- Results with reference substance:
- 84% of biodegradation after 28 days.
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- not readily biodegradable
- Conclusions:
- A test susbstance has a potential for biodegradation in the marine environment, if it has been degraded 60% within 28d.
Triazolone was degraded by 3% after 28 days. Based on this, the test substance can not be characterised as readily biodegradable in the marine environment according to the OECD guideline 306. - Executive summary:
A test susbstance has a potential for biodegradation in the marine environment, if it has been degraded 60% within 28d.
Triazolone was degraded by 3% after 28 days. Based on this, the test substance can not be characterised as readily biodegradable in the marine environment according to the OECD guideline 306.
Reference
none
Description of key information
A test susbstance has a potential for biodegradation in the marine environment, if it has been degraded 60% within 28days.
Triazolone gave 3% biodegradation after 28 days. Based on this, the test substance cannot be characterised as being readily biodegradable in the marine environment according to the OECD guideline 306.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
- Type of water:
- marine water
Additional information
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