Registration Dossier
Registration Dossier
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EC number: 403-030-6 | CAS number: 137398-54-0 ROBAC AS/100
Biodegradation in water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
- Endpoint:
- biodegradation in water: simulation testing on ultimate degradation in surface water
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 309 (Aerobic Mineralisation in Surface Water - Simulation Biodegradation Test)
- GLP compliance:
- yes
- Radiolabelling:
- yes
- Oxygen conditions:
- aerobic
- Inoculum or test system:
- natural water / sediment: freshwater
- Duration of test (contact time):
- > 1 - < 28 d
- Initial conc.:
- ca. 80 <= µg/L
- Based on:
- test mat.
- Parameter followed for biodegradation estimation:
- radiochem. meas.
- Reference substance:
- benzoic acid, sodium salt
- Key result
- Compartment:
- natural water / sediment: freshwater
- DT50:
- ca. 2 d
- Type:
- (pseudo-)first order (= half-life)
- Temp.:
- 12 °C
- Transformation products:
- yes
- No.:
- #1
- Evaporation of parent compound:
- not specified
- Volatile metabolites:
- yes
- Residues:
- not specified
- Validity criteria fulfilled:
- yes
- Conclusions:
- AS100 and its hydrolysis degradant are not persisent and are readily biodegradabe.
Reference
Description of key information
The screening test was a mimic of the OECD 309 test without sediment, using radiolabelled AS100. However, a further screening test has proven that AS100 does not adsorb onto sediment so the results from the riverwater screening tests also apply to the sediment.
The results from the full OECD 309 test, with suspended sediment, concludes that AS100 is not persistent and that DIXD, the main degradant, is also not persistent. Due to the nature of measuring AS100 and DIXD through radio-labelling it has been demonstrated that both of these materials are readily biodegradable with both of them showing half-lives of between 4 -10 days. This also answers the question regarding persistence and confirms the conclusion that AS100, and its degradant DIXD, are neither vPvB or PBT.
Key value for chemical safety assessment
- Half-life in freshwater:
- 4 d
- at the temperature of:
- 12 °C
- Half-life in freshwater sediment:
- 4 d
- at the temperature of:
- 12 °C
Additional information
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