Registration Dossier
Registration Dossier
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EC number: 291-759-9 | CAS number: 90480-27-6
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
In accordance with the column 2 specific rules for adaptation from column 1, a study for determination of the octanol/water partition coefficient is technically unfeasible. A Log Pow of 7.73 was determined for the unionised organic acid.
Key value for chemical safety assessment
- Log Kow (Log Pow):
- 7.73
- at the temperature of:
- 25 °C
Additional information
In accordance with the column 2 specific rules for adaptation from column 1, a study for determination of the octanol/water partition coefficient is technically unfeasible. The partition coefficient could not be determined using a procedure designed to be compatible with EC Method A8 and OECD Guideline 117. Based on the knowledge derived from determination of the absorption coefficient (Harlan study 41400253). The adsorption coefficient uses a HPLC screening method that comprises of a reverse phase system where the mobile phase is methanol and water based. Information supplied on the test substance stated that the substance was a zinc-organic acid complex that was unstable in the presence of polar or protiotic solvents e.g. methanol and water. As the mobile phase used in the partition coefficient test would also have to be methanol and water based, it was highly probable that decomposition would also occur while in contact with the mobile phase, especially as it was expected that the test item would remain on the column for at least as long as it did during the adsorption coefficient test. The method guidelines state that the test is not applicable to test items that react with the mobile phase or are metal complexes. The shake flask method would also not be applicable as again it would come into contact with water. In addition, the upper Log Pow limit for this method is significantly lower than the expected Log Pow for the test material. It is not possible to calculate an estimated partition coefficient using KOWWIN v1.68, US EPA as the model is not validated for zinc ions. Taking into consideration the fact that the test item will decompose, an estimated Log Pow has been calculated for the residual organic acid. The Log Pow for octadec-9-enoic acid (oleic acid) is given in EPISUITE as 7.73 (KOWWIN v1.68, US Environmental Protection Agency's Office of Pollution Prevention and Toxics and Syracuse Research Corporation (SRC)). Overall it was determined that there are no methods available that will allow experimental determination of the partition coefficient of the test item as supplied.
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