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Environmental fate & pathways

Hydrolysis

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Description of key information

The preliminary study showed that at each of pH 4, 7 and 9 and 50±0.5ºC, more than 50% hydrolysis had occurred after 2.4 hours, equivalent to a half-life of less than 1 day under environmental conditions (25°C). Benzoic acid, the main expected degradation compound, was present in the hydrolysed solutions at each test pH.
Given the rapidity of the hydrolysis reaction, no further testing was considered necessary.
Dibenzoyl peroxide was determined to be hydrolytically unstable under acidic, neutral and basic conditions.

Key value for chemical safety assessment

Additional information

A study was performed to determine the rate of hydrolysis of Dibenzoyl peroxide as a function of pH. The test was conducted in accordance with the preliminary test as described in Council Regulation (EC) No. 440/2008 (Method C7) and the OECD Guidelines for the Testing of Chemicals (Method 111).

The preliminary study showed that at each of pH 4, 7 and 9 and 50±0.5ºC, greater than 50% hydrolysis had occurred after 2.4 hours, equivalent to a half-life of less than 1 day under environmental conditions (25°C). Benzoic acid, the expected main degradation product, was present in the hydrolysed solutions at each test pH.

Given the rapidity of the hydrolysis reaction, no further testing was considered necessary.

Dibenzoyl peroxide was determined to be hydrolytically unstable under acidic, neutral and basic conditions.