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Environmental fate & pathways

Hydrolysis

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Description of key information

Half-life = greater than 1 year at a pH of 4 and 25 °C.
17 days at a pH of 7 and 25 °C.
11.3 days at a pH of 9 and 25 °C.

Key value for chemical safety assessment

Additional information

Hydrolysis as a function of pH was performed according to OECD Guideline 111 and EU-method C.7. (Preliminary test; main test not conducted due to the pronounced biodegradability of the test substance). At pH 4 and 50 °C, the degradation of the main component of partially unsaturated TEA-Esterquat was less than 10 % over a period of 120 h. The corresponding half-life at 25 °C is therefore assumed to be above one year (default assumption acc. to guidelines). In contrast, at pH 7 and 9 and 50 °C, more than 10 % of the test item were hydrolysed within 120 h. Based on the results, half-lives of 17 d (pH 7) and 11.3 d (pH 9) were deduced from the reaction rate constants at 25 °C. Di- and mono-ester were detected as degradation products.

 

However, a study on hydrolysis of partially unsaturated TEA-Esterquat is not needed, as the substance is readily biodegradable. TEA-Esterquats possess ester links introduced into the head-group of the molecules, which have the quality that they are susceptible to biodegradation as well as hydrolysis.