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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The Koc is required for exposure assessment and derivation of PNECsoil and PNECsediment. In the absence of measured data, the Koc has been estimated from Kow.

Key value for chemical safety assessment

Koc at 20 °C:

Additional information

Regression model: Log Koc = 0.52 Log Kow + 1.02

Applicability Domain: chemical class “nonhydrophobics”; Log Kow range of -2 to 8.0; all chemicals that are not classified as hydrophobics. Hydrophobics are chemicals with C, H, F, Cl, Br and I atoms. Since Safranal contains C, H and O atoms it is considered “nonhydrophobic”.

Reference: ECB TGD on Risk Assessment, Part III, Chapter 4 (2003), available at

The log Kow for SAFRANAL is 2.7 giving an estimated Log Koc of 2.42 (equivalent to Koc of 263)