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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Key value for chemical safety assessment

Additional information

A cut off value for log Kow (logKoc) of 3 is applied for adsorption potential of non-ionising substances (section R7a of the ECHA Guidance on information requirements). Styrene has an estimated log Kow of 2.89 (a very close default value used in EPI Suite (v.4.00) software for styrene is log Kow=2.95).

The organic carbon-water partition coefficient (Koc) was calculated using KOCWIN v. 2.0. based on the first-order molecular connectivity index (MCI) and the logKow = 2.95.

Koc (estimated from MCI) = 446.1 L/kg, logKoc = 2.65

Koc (estimated from logKow) =363 L/kg; log Koc=2.56

These values indicate that adsorption onto soil and sediment is not likely to be important for styrene.