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Environmental fate & pathways

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According to the requirements of the regulation (EC) No 1907/2006 the biodegradability of ortho-phthalaldehyde was tested according to the OECD test guideline 301 B and in compliance with the OECD-GLP standards (Weiss-Fuchs 2002).

The mean degradation rate of the test substance was 7 % after 28 days. Therefore, ortho-phthalaldehyde is considered to be not readily biodegradable.

Abiotic degradation was assessed in a hydrolysis study according to OECD test guideline 1111 and in compliance with OECD-GLP standards (Möller 2019).

The test results suggest that the reaction of the test item with water at pH 4 and pH 7 is not an irreversible hydrolytic reaction but rather an equilibrium reaction, as an immediate reaction with water was reported reaching a stable status.

The half-life for pH 9 cannot be estimated. For a calculation of the reaction kinetics, the concentration of the test item has to be measured at six times at least, which was not possible for the present case.

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