Registration Dossier
Registration Dossier
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EC number: 500-241-6 | CAS number: 69011-36-5 1 - 2.5 moles ethoxylated
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
log Pow – experimental value: 6.4 (OECD 117, HPLC method)
log Pow - calculated using KOWWIN v1.68 (weight-averaged value): 4.55 (EPIsuite v4.10)
log Pow - calculated from weight-averaged log Koc value: 4.90 (calculation based on 2003 EU TGD)
Key value for chemical safety assessment
- Log Kow (Log Pow):
- 4.73
- at the temperature of:
- 25 °C
Additional information
The log Pow of the substance was determined experimentally using the HPLC method according to OECD Guideline 117. The applicability of the HPLC method to determine the log Pow of this surface active substance is questionable. Although it was argued by the test lab that the substance mainly contained fatty alcohols, this statement cannot be confirmed through the composition of the substance. Due to discrepancy, the experimental result is not considered for the derivation of the key value for chemical safety assessment.
Therefore, the key value for chemical safety assessment is derived in a weight-of-evidence approach from the various calculated log Pow values (average of values 4.55 and 4.90) for Isotridecanol, ethoxylated, < 2.5 EO (CAS 69011-36-5).
The following types of calculations were applied:
1. based on weight-averaged log Koc values using the TGD equation for predominantly hydrophobic substances: log Koc = 0.81 log Pow + 0.10 thus log Pow = (log Koc – 0.10)/0.81 (2003 EU Technical Guidance Document on Risk Assessment Part III, Chapter 4, Section 4.3, pp 24 – 27)
2. based on EPIsuite v 4.10, KOWWIN v 1.68 log Pow values for (possible) individual constituents of the substance; a weighting based on normalized composition was applied to derive a log Pow value for the whole substance. Only the weight-averaged value was used as input value for derivation of the key value.
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