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Environmental fate & pathways

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Description of key information

The test item is not considered to be hydrolytically stable at pH 4, 7 and 9.

Additional information

The hydrolysis of Irgamet 39 as a function of pH was determined at three different pH-values by the method OECD 111 (BASF, draft report, 2022). At each pH hydrolytical decomposition can be observed, e.g. at a pH of 7 with the rate konstant k at 20 C° of 0.00591 1/h and a DT50 of 117.3 h, and at 25 C° of 0.00852 1/h and a DT50 of 81.4 h. The final hydrolysis product could be identified as Irgamet TTZ (Methyl-1H-benzotriazole).


Based on a previous tier 1 study, the test item is not considered to be hydrolytically stable at pH 4, 7 and 9. Methyl-1H-benzotriazole was detected as hydrolysis product. Additionally the following transformation products were proposed: Formaldehyde (CAS No. 50-00-0), Diethylhexylamine (CAS No. 106-20-7).