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Physical & Chemical properties

Partition coefficient

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Description of key information

not applicable

Key value for chemical safety assessment

Additional information

Due to the complex inorganic and organic composition of the substance, the partition coefficient of the substance as such is not possible to be determined experimentally nor estimated using QSAR. Detailed explanation is given in the waiving statement and supporting expert statement.

In the result of the theoretical assessment it is concluded that determination of the reliable experimental n-octanol/water partition coefficient of the substance is not technically feasible.

Currently available testing methods (and guidelines): Shake Flask Method (EU A.8, OECD TG 107), HPLC Method (EU A.8, OECD TG 117), Slow-Stirring Method (OECD TG 123) and estimation of the partition coefficient based on individual solubilities in water and n-octanol (EU A.8, Appendix 1) are non-applicable for the substance. The main reasons leading to this conclusion can be found in the complex and unknown nature of Vinasses (UVCB substance) in combination with technical limitations of analytical methods and procedures.

QSAR predictions for each component individually are also not applicable either due to the complex composition and the unknown or inorganic structure of the constituents. Furthermore a rough estimated single log Kowvalue or a broad range of log Kowvalues for the substance is not meaningful and would not contribute to hazard assessment or classification and labelling of the substance.

The testing possibilities were considered and evaluated also by the testing laboratory WIL Research Europe which confirmed in the expert statement that the determination of the reliable log Kowvalue to be used for the hazard and risk assessment purposes for Vinasses is technically not feasible.

The general term Vinasses is used as a synonym/surrogate for the substance to be registered.