Registration Dossier
Registration Dossier
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: 701-162-1 | CAS number: -
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
The Partition coefficient of Penta-PSCA is logPow=3.64.
Key value for chemical safety assessment
- Log Kow (Log Pow):
- 3.64
- at the temperature of:
- 20 °C
Additional information
Due to the surface activity of the test substance the shake-flask method according to OECD guideline 107 or the HPLC method according to OECD guideline 117 are not applicable. Therefore the partition coefficient was calculated from the individual solubilities in n-octanol and water according to REGULATION (EC) No 440/2008 - A.8. PARTITION COEFFICIENT - Appendix 1 Calculation/estimation methods. The Partition coefficient n-octanol/water is logPow = 3.64 at 20°C.
As the substance is miscible with n-octanol the density was chosen as solubility in n-octanol. (s. IUCLID-Chapter 4.9 for details)
The critical micelle concentration was chosen as parameter for the water solubility. This is considered to be a worse case value for the following reasons:
Surfactants show a complex solubility behaviour due to aggregation. They can form different types of solutions in water (e.g. mono-molecular-, micellar-, hexagonal or lamellar solutions) depending on concentration and temperature. The mono-molecular solubility of a surfactant is defined by the critical micelle concentration (cmc). The monomer concentration, and hence the thermodynamic activity, reaches a limiting value at the cmc. It remains approximately constant as the total concnetration is further increased. For ecotocicological models requiring a solubility value, the cmc is therefore the appropriate parameter for water solubility and may be used as a worst-case approach in cases where the resulting log Pow is not critical. The cmc underestimates the total solubility of a surfactant and hence overestimates the partition coefficient.
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.
