Registration Dossier
Registration Dossier
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EC number: 218-747-8 | CAS number: 2224-33-1
Partition coefficient
Administrative data
Link to relevant study record(s)
- Endpoint:
- partition coefficient
- Type of information:
- (Q)SAR
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
- Remarks:
- Internationally accepted method, EPI-Suite, EPA (USA)
- Justification for type of information:
- See attached the QMRF and QPRF for the QSAR model.
- Principles of method if other than guideline:
- Calculation by EPI-Suite, EPA (USA) / KOWWIN v1.68
- Type of method:
- other: estimated by calculation
- Partition coefficient type:
- octanol-water
- Key result
- Type:
- log Pow
- Partition coefficient:
- 1.69
- Remarks on result:
- other: (KOWWIN v1.67 estimate. No data is provided on temperature and pH).
- Conclusions:
- The estimated log octanol-water partition coefficient (Log Kow) is 1.69 (EPI-Suite, KOWWIN v1.68)
- Executive summary:
The substance estimated log octanol-water partition coefficient (Log Kow) is 1.69 (EPI-Suite, KOWWIN v1.68)
- Endpoint:
- partition coefficient
- Type of information:
- (Q)SAR
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
- Remarks:
- Internationally accepted method, EPI-Suite, EPA (USA)
- Justification for type of information:
- See attached the QMRF and QPRF for the QSAR model.
- Principles of method if other than guideline:
- Calculation by EPI-Suite, EPA (USA) / KOWWIN v1.68
- Type of method:
- other: estimated by calculation
- Partition coefficient type:
- octanol-water
- Key result
- Type:
- log Pow
- Partition coefficient:
- -2.01
- Remarks on result:
- other: (KOWWIN v1.67 estimate. No data is provided on temperature and pH).
- Conclusions:
- The estimated log octanol-water partition coefficient (Log Kow) is -2.01 (EPI-Suite, KOWWIN v1.68)
- Executive summary:
The substance estimated log octanol-water partition coefficient (Log Kow) is -2.01 (EPI-Suite, KOWWIN v1.68)
- Endpoint:
- partition coefficient
- Data waiving:
- study technically not feasible
- Justification for data waiving:
- other:
- Justification for type of information:
- JUSTIFICATION FOR DATA WAIVING
According to Column 2 of REACH Annex VII, the study cannot be conducted since the substance undergoes rapid hydrolysis (half-life < 1h) in aqueous to 2-butanone oxime and the corresponding vinylsilanetriol. Moreover, silanetriols undergo continuous condensation reactions to produce higher molecular weight siloxanes which are considered biologically unavailable. - Endpoint:
- partition coefficient
- Type of information:
- other: Handbook peer reviewed
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Principles of method if other than guideline:
- No data provided on the method.
- GLP compliance:
- not specified
- Type of method:
- other: no data
- Key result
- Type:
- log Pow
- Partition coefficient:
- 0.36
- Remarks on result:
- other: (temperature and pH were not indicated)
- Conclusions:
- The partition coefficient (log Pow) of butanone oxime is 0.36.
- Executive summary:
The partition coefficient (log Pow) of butanone oxime is 0.36.
Referenceopen allclose all
Description of key information
The Log Kow of test item should be understood based on its degradation products since it undergoes rapid hydrolysis (half-life < 1h) in aqueous to 2-butanone oxime (log Kow = 1.69, KOWWIN v1.68) and vinylsilanetriol (Log Kow = -2.01, KOWWIN v1.68).
Key value for chemical safety assessment
- Log Kow (Log Pow):
- 1.69
Additional information
According to Column 2 of REACH Annex VII, the study cannot be conducted since the substance undergoes rapid hydrolysis (half-life < 1h) in aqueous to 2-butanone oxime and vinylsilanetriol. Morevoer, the corresponding silanols undergo continuous condensation reactions to produce higher molecular weight siloxanes which are considered biologically unavailable.
The estimated log octanol-water partition coefficients (Log Kow) for the degradation products, 2 -butanone oxime and vinylsilanetriol were 1.69 and -2.01 (EPI-Suite, KOWWIN v1.68). Moreover, according to Verschueren et al (2009) the Log Kow of 2 -butanone oxime was reported to be 0.36.
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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