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Partition coefficient

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Description of key information

Experimental Pow at 20°C based on the ration of the solubility in n-octanol and water : 0.65
Experimental log Pow at 20°C based on the ration of the solubility in n-octanol and water : -0.19

Key value for chemical safety assessment

Log Kow (Log Pow):
at the temperature of:
20 °C

Additional information

The determination of the partition coefficient is based on the ratio of the solubility in n-octanol and water. Indeed, the test item has surface active properties (45.3mN/m at 20.3°C) , so the traditional methods (Shake-flask and HPLC) can not be used. In this case, the determination is done according to EU Method A.6, OECD Guideline 105 and GLP. No deviation from the guideline was observed during the test.

The partition coefficient of the test substance is close to the value of an analogue substance. The analogue is "Reaction product of naphthalene, propan-2-ol, sulfonated and neutralized by caustic soda" having a log Pow at 20°C of -0.27. The same method was used for the analogue substance and the test substance to determine this parameter (ratio of solubility in n-octanol and solubility in water). The slight difference between these two values can be explained by the chemical structure of these two substances. The analogue substance possess a smaller carbon chain than the test substance. So it has more affinity for the water phase. That's why the partition coefficient is higher for the test substance.