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Environmental fate & pathways

Hydrolysis

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Description of key information

Under environmental conditions with natural surface water with suspended organic material

and deionized water with humic acid half-lives at 12 °C half-lives were 11.5h and 11.9h, respectively.

The identified hydrolysis products are 2-Ethylhexanoic acid (CAS 149 -57 -5), Neopentyl alcohol (CAS 75 -84 -3) and Acetone (CAS 67 -64 -1).

Key value for chemical safety assessment

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

Additional information

In a standard OECD 111 study with standard pH buffers the following half-lives were found:

At a pH value of 4 the half-life (t½) for 1,1,3,3-tetramethylbutyl 2-ethylperoxyhexanoate at a temperature of 12°C was calculated to be 15 hours.

At a pH value of 7 the half-life (t½) for 1,1,3,3-tetramethylbutyl 2-ethylperoxyhexanoate at a temperature of 12°C was calculated to be 16 hours.

At a pH value of 9 the half-life (t½) for 1,1,3,3-tetramethylbutyl 2-ethylperoxyhexanoate at a temperature of 12°C was calculated to be 19 hours.

Under more environmental conditions with natural surface water with suspended organic material and deionized water with humic acid half-lives were determined according to OECD guideline 111. Under these conditions hydrolysis was significantly faster. Half-lives at 12 °C in natural surface water with suspended organic material and deionized water with humic acid were 11.5h and 11.9h, respectively.

In a separeate study tier 3 of OECD guideline 111 was performed. Hydrolysis products were identified in standard buffer solutions as well as in natural surface water with suspended organic material and deionized water with humic acid, all at 12 °C. The following substances were identified as the major hydrolysis products originating from the test substance; 2-Ethylhexanoic acid, Neopentyl alcohol and Acetone. The presence of dissolved and suspended organic material did not appear to decrease the hydrolysis rate or affect which hydrolysis products were formed.