Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 203-657-3 | CAS number: 109-23-9
Partition coefficient
Administrative data
Link to relevant study record(s)
- Endpoint:
- partition coefficient
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 07 Jun 2018 to 12 Sep 2018
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.8 (Partition Coefficient - HPLC Method)
- Version / remarks:
- 30 May 2008
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 117 (Partition Coefficient (n-octanol / water), HPLC Method)
- Version / remarks:
- 13 April 2004
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- HPLC method
- Partition coefficient type:
- octanol-water
- Analytical method:
- high-performance liquid chromatography
- mass spectrometry
- Key result
- Type:
- log Pow
- Partition coefficient:
- > 6.5
- Temp.:
- 25 °C
- pH:
- 6.5
- Details on results:
- See 'Any other information on results incl. tables' for an overview of the analytical results.
- Conclusions:
- The partition coefficient of the test item has been determined to be greater than 3.16E6 (log Pow >6.5).
- Executive summary:
The octanol-water partition coefficient (Log Pow) of that test item was determined based on the HPLC Method, using a procedure designed to be compatible with OECD TG 117 and in compliance with GLP. The octanol-water partition coefficient (Log Pow) of test substance was greater than 6.5
Reference
The retention times, capacity factor and log10 Pow value determined for the sample are shown in the following table:
Peak Identity |
Injection |
Retention Time (mins) |
Capacity Factor (k') |
Log10k' |
Log10Pow |
Mean Log10POW |
Partition Coefficient |
Peak 1 |
1 |
23.320 |
> 7.98 |
> 902 |
> 6.5 |
> 6.5 |
> 3.16 x 106 |
2 |
23.313 |
> 7.98 |
> 902 |
> 6.5 |
|||
Peak 2 |
1 |
23.649 |
> 7.98 |
> 902 |
> 6.5 |
> 6.5 |
> 3.16 x 106 |
2 |
23.652 |
> 7.98 |
> 902 |
> 6.5 |
|||
Peak 3 |
1 |
23.901 |
> 7.98 |
> 902 |
> 6.5 |
> 6.5 |
> 3.16 x 106 |
2 |
23.902 |
> 7.98 |
> 902 |
> 6.5 |
DISCUSSION
It was considered that the HPLC method would be the most suitable for determination of partition coefficient. As the test item contains no environmentally relevant dissociation constants, testing was performed at approximately neutral pH (eluent A: THF : Purified water (50:50 v/v), pH 6.5). The test item was eluted from the column after the retention time of DDT using eluent B (THF : 0.05 M ammonium formate, 0.2% formic acid, 0.1% trifluoroacetic acid (90:10 v/v). Acidified eluent was used to ionize the test item for MS detection.
Description of key information
log Pow > 6.5 at 25 °C, compatible with OECD 117, HPLC method, Butler 2018
Key value for chemical safety assessment
Additional information
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
