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Environmental fate & pathways

Hydrolysis

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Description of key information

The half-life times of styrene oxide in aqueous solution are 18 h (pH 7) and 1.6 days (pH 9) at 25 °C, respectively.  

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Additional information

Hydrolysis as a function of pH was performed according to OECD Guideline 111 and EU-method C.7. At temperatures from 20 to 60 °C a temperature depending decrease of half-life time was observed; 27 h to 1.2 h at pH 7 and 2.4 d to 2.4 h at pH 9. Based on the results, half-life times of 18 h (pH 7) and 1.6 days (pH 9) were deduced for styrene oxide from the reaction rate constants at 25 °C.