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Environmental fate & pathways

Hydrolysis

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Description of key information

The hydrolysis of tert-butyl peroxypivalate in different aqueous buffer solutions (pH = 4, 7 and 9) at 15, 37 and 50 °C was investigated using HPLC-UV. Measurements revealed a fast hydrolysis of  tert-butyl peroxypivalate (half-live: 4 hours) at pH = 4 and 50 °C.  The degradation products of the hydrolysis of tert-butyl peroxypivalate are tert-butyl hydroperoxide and pivalic acid. 

Key value for chemical safety assessment

Half-life for hydrolysis:
145 h
at the temperature of:
25 °C

Additional information

The hydrolysis of tert-butyl peroxypivalate 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 tert-butyl peroxypivalate in different aqueous buffer solutions (pH = 4, 7 and 9) at 15, 37 and 50 °C was investigated using HPLC-UV. Measurements revealed a fast hydrolysis of TBPPI (half-live: 4 hours) at pH = 4 and 50 °C. Applying Arrhenius equation the rate constant and half-live at pH = 4, 7 and 9 were calculated at 20 and 25°C. The half-life at pH = 4, 7 and 9 at 20 °C are 247 hours, 319 hours and 309 hours, respectively. The half-life at pH = 4, 7 and 9 at 25 °C are 118 hours, 145 hours and 136 hours, respectively. It could be shown that the hydrolysis of tert-butyl peroxypivalate was dependent from the pH and the temperature of the aqueous media. The degradation products (tert-butyl hydroperoxide and pivalic acid) were successfully identified using HPLC-UV.