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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Koc = 316 - 446; log Koc = 2.5 - 2.65 (experimental data)

Key value for chemical safety assessment

Koc at 20 °C:
316

Additional information

In a key study by Marchesi et al.(1991) the test substance is indicated to be of low sorption potential with an estimated Koc value of 316 to 446 which corresponds to log Koc values in the range of 2.50 to 2.65. For the PNEC sediment and soil derivation, according to the equilibrium partitioning method (EPM), the lower boundary of the range (Koc = 316) was taken into account, since this value represents the worst case scenario for the chemical safety assessment.

In a supporting publication by Marshall et al. (2000), the water-sediment partition coefficient (kd) for the test substance was determined as 30.78 L/kg in a cylindric adsorption apparatus using humic acid recoated organic free sediments. Assuming % Org. C: 16 a Koc value of 192.39 could be calculated (log koc = 2.28).

[LogKoc: 2.5]