Registration Dossier
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EC number: 257-851-8 | CAS number: 52328-05-9
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:
- 1990
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 301 E (Ready biodegradability: Modified OECD Screening Test)
- GLP compliance:
- yes
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- activated sludge, domestic, non-adapted
- Duration of test (contact time):
- ca. 42 d
- Reference substance:
- acetic acid, sodium salt
- Key result
- Parameter:
- % degradation (DOC removal)
- Value:
- ca. 0
- Sampling time:
- 7 d
- Key result
- Parameter:
- % degradation (DOC removal)
- Value:
- ca. 5
- Sampling time:
- 14 d
- Key result
- Parameter:
- % degradation (DOC removal)
- Value:
- ca. 7
- Sampling time:
- 21 d
- Key result
- Parameter:
- % degradation (DOC removal)
- Value:
- ca. 15
- Sampling time:
- 28 d
- Key result
- Parameter:
- % degradation (DOC removal)
- Value:
- ca. 83
- Sampling time:
- 42 d
- Details on results:
- Additional results see "overall remarks"
- Validity criteria fulfilled:
- yes
- Interpretation of results:
- inherently biodegradable
- Conclusions:
- O-Methylisourea degraded by 65-83% within 42 days. After 28 days a degradation of only 15% was found. Therefore O-Methylisourea sulfate is considered "not ready biodegradable" but "inherent biodegradeable" although a OECD 302 test hasn't been performed.
- Executive summary:
Using removal of dissolved organic carbon (DOC) as test criterion, the biodegradability of O-methylisourea sulphate was determine essentially by thh method described in the OECD Guideline 301E, Ready Biodegradability: Modified OECD Screening Test.
A control test showed that the activity of the incolum was sufficient and that no significant effect of the test substance on this acitvity was found.
The test substance is not readily biodegradable in either compelte or nitrogen-free medium.
It had no effect on the degradation of acetate.
O-Methylisourea degraded by 65-83% within 42 days. After 28 days a degradation of only 15% was found. Therefore O-Methylisourea sulfate is considered "not ready biodegradable" but "inherent biodegradeable"
Reference
Description of key information
O-Methylisourea degraded by 65-83% within 42 days. After 28 days a degradation of only 15% was found.
Therefore O-Methylisourea sulfate is considered "not ready biodegradable" but "inherent biodegradeable" although a OECD 302 test hasn't been performed.
Key value for chemical safety assessment
- Biodegradation in water:
- inherently biodegradable
Additional information
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