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EC number: 219-842-7 | CAS number: 2550-02-9
Biodegradation in water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
- Endpoint:
- biodegradation in water: sediment simulation testing
- Data waiving:
- other justification
- Justification for data waiving:
- other:
- Transformation products:
- yes
- Remarks:
- Degradation is principally expected via abiotic transformation (aqueous). The transformation products expected are those identified in IUCLID section 1.10 "transformation of the registered substance", the environmental hazard assessment is based on those.
- No.:
- #1
- No.:
- #2
- Endpoint:
- biodegradation in water: simulation testing on ultimate degradation in surface water
- Data waiving:
- other justification
- Justification for data waiving:
- other:
- Transformation products:
- yes
- Remarks:
- Degradation is principally expected via abiotic transformation (aqueous). The transformation products expected are those identified in IUCLID section 1.10 "transformation of the registered substance", the environmental hazard assessment is based on those.
- No.:
- #1
- No.:
- #2
Referenceopen allclose all
Description of key information
Key value for chemical safety assessment
Additional information
The simulation test on ultimate degradation in surface water and sediment as well as the identification of degradation products do not need to be conducted as:
- in accordance with Column 2 of REACH Annex IX, the chemical safety assessment according to Annex I indicates that this is not necessary,
and
- in accordance with Section 3 of REACH Annex XI, exposure of the aquatic/sediment compartment is not significant.
Simulation tests (water and sediments) are not considered necessary because:
- The substance hydrolyses moderately and the silanol hydrolysis product has a low log Kow value and, therefore, exposure of the sediment compartment is expected to be low.
- The risk characterisation ratios (RCRs) for the aquatic and sediment compartments, based on the assumption that the silanol hydrolysis product is not biodegradable, are <1.
- The non-silanol hydrolysis product, ethanol, is readily biodegradable.
The available evidence regarding biodegradation and persistence of organosilicon compounds is summarised in an attached document in Section 13 (PFA 2021).
Reference:
PFA (2021): Background to persistence assessment of organosilicon compounds, Reference: PFA.923.001.001, February 2021.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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