Registration Dossier
Registration Dossier
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EC number: 800-984-9 | CAS number: 1428547-35-6
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
The registered substance is a salt composed of a primary alkyl amine and a fatty acid. Experimental determinations of the log Kow for this salt and the cationic surfactant moieties technically are not possible.
"solubility in octanol" / "solubility in water" ratios can be used as a surrogate to determine the log Kow value of the cationic primary alkyl amine.
log Kow (C12) = 2.19
log Kow (C14) = 2.65
log Kow (C16) = 3.37
log Kow (C18) = 3.99
log Kow (C18 monoinsaturated) = 4.33
Key value for chemical safety assessment
- Log Kow (Log Pow):
- 4
- at the temperature of:
- 20 °C
Additional information
The registered substance is a salt composed of a primary alkyl amine and a fatty acid. In the Chapter R.7A of the REACH guidance (Section R.7.1.8.3; Guidance on regulatory compliant Kow determination for surfactants), it is indicated that none of the experimental methods is very well suited for determining the Kow of surface active chemicals. The slow stirring method (OECD 123) seems to be the best in theory, but still not demonstrated to be perfect. Indeed, due to the physico-chemical properties of surfactants, specifically their tendency to either accumulate at the octanol/water interface or to coat the surfaces of the above-described HPLC adsorbent phase, the log Kow of surfactants cannot be accurately measured for these substances. However, as concluded in the report of water solubility (Walker, 2013), the test substance has too low water solubility for determination of CMC and surface tension. According to the REACH guidance Chapter R.7A, the ratio solubility in octanol / solubility in water is acceptable for surfactants. Therefore, ratio are calculated for each of the main constituents : dodecylamine, tetradecylamine, hexadecylamine and octadecylamine (see water solubility and solubility in organic solvents section). Concerning the other part of the salt, stearic acid, a log Kow value is available and was determined to be 8.23 (Handbook, 1989).
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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