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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: - | CAS number: -
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
The partition coefficient is defined as the ratio of the equilibrium concentrations of a dissolved substance in a two-phase system consisting of two largely immiscible solvents. In this study, the partition coefficient is the ratio of the measured concentration of the test item in the n-octanol phase and the measured concentration of the test item in the water phase.
Experimental value for test item solubility in n-octanol at 20°C: 0.60 ± g/l 0.08g/l
Experimental value for test item water solubility at 20°C: 187.45 g/l ± 14.98 g/l
Calculated partition coefficient : 0.0032
Calculated log Kow : – 2.50 ± 0.09
Key value for chemical safety assessment
- Log Kow (Log Pow):
- -2.5
- at the temperature of:
- 20 °C
Additional information
The test item is a surfactant product (surface tension = 33.2 mN/m ± 0.1 mN/m at 21.0 ± 0.1 °C) so the shake flask and HPLC methods (E.U A8) can’t be used. In this case, the partition coefficient is calculated by the ratio of solubilities of test item in n-octanol and in water, determined with the flask method. The method used for this determination is consistent with to A.6: “Water solubility”, May 2008 and to the OECD Guidelines n° 105: “Water solubility”, adopted July, 27, 1995. No deviations form the guidelines were observed during the test.
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.
