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Environmental fate & pathways

Hydrolysis

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Description of key information

The hydrolysis of cyclohexylidenebis[tert-butyl] peroxide in different aqueous buffer solutions (pH = 4, 7 and 9) at 5, 15 and 25 °C was investigated using HPLC-UV. Measurements revealed a fast hydrolysis of cyclohexylidenebis[tert-butyl] peroxide (half-live: 27 hours) at pH = 4 and 25 °C. The degradation products of the hydrolysis of cyclohexylidenebis[tert-butyl] peroxide are tert-butyl hydroperoxide and cyclohexanon.

Key value for chemical safety assessment

Half-life for hydrolysis:
127.1 h
at the temperature of:
12 °C

Additional information

The hydrolysis of cyclohexylidenebis[tert-butyl] peroxide and the identification of the decomposition products was assessed in accordance with the OECD guideline 111 and the EU method C.7. The hydrolysis of cyclohexylidenebis[tert-butyl] peroxide in different aqueous buffer solutions (pH = 4, 7 and 9) at 5, 15 and 25 °C was investigated using HPLC-UV. Measurements revealed a fast hydrolysis of the test substance (half-life: 27 hours) at pH = 4 and 25 °C. Applying Arrhenius equation the rate constant and half-lives at pH = 4, 7 and 9 were calculated at 20 °C. The half-life at pH = 4, 7 and 9 at 20 °C are 40 hours, 80 hours and 109 hours, respectively. It could be shown that the hydrolysis of cyclohexylidenebis[tert-butyl] peroxide was dependent from the pH and the temperature of the aqueous media. The degradation products of cyclohexylidenebis[tert-butyl] peroxide (tert-butyl hydroperoxide and cyclohexanon) were successfully identified on the basis of their retention times using HPLC-UV and GC-FID. For chemical safety assessment the half-life and the hydrolysis rate constant at the environmentally relevant temperture (12 °C) were calculated to be 127.1 h and 0.00545 h-1, respectively.