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Environmental fate & pathways

Adsorption / desorption

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Description of key information

According to the classification of Blume & Ahlsdorf (1993) styrene oxide can be regarded as a substance with a low sorption onto soil organic matter. 

Key value for chemical safety assessment

Koc at 20 °C:
38

Additional information

In a study conducted according the OECD guideline 121 the adsorption coefficient Koc of styrene oxide was investigated. The HPLC method using soil-adsorption-reference data was chosen for the determination of the adsorption coefficient. Based on the pKa calculations using the Perrin calculation method (pKalc 5.0, module in Pallas 3.0, CompuDrug International San Francisco, CA, USA) the HPLC analysis was performed at neutral pH. A Koc value of 38 corresponding to a log Koc of 1.58 was determined for styrene oxide.

This result is supported by the calculation using EPIWIN v3.20, PCKOCWIN v1.66. The calculated soil sorption coefficient is Koc=54 (log Koc=1.73).