Registration Dossier
Registration Dossier
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EC number: 249-596-6 | CAS number: 29385-43-1
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Tolyltriazole is a technical mixture of two isomers (4-methyl-benzotriazole and 5-methyl-benzotriazole). Available information indicates different potential for biodegradation. While 5-methyl-benzotriazole has shown full mineralization under test conditions, 4-methyl-benzotriazole has not been degraded. Thus, in summary Tolyltriazole has been considered stable to biodegradation.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
Several guideline studies on biodegradability of the technical mixture Tolyltriazole as well as the individual isomers are available. All tests have shown no or little potential for biodegradation. As in single isomer testing 5 -methyl-benzotriazole has shown good biodegradability (full mineralization has been observed under test conditions in ISO 7827 test) in testing with 4 -methyl-benzotriazole no biodegradation has been observed. Finally, a study on readily biodegradation with Tolyltriazole has shown four percent degradation after 28 days under test conditions.
In summary, Tolyltriazole is considered as non-biodegradable in the aquatic compartment as 4 -methyl-benzotriazole has been assumed as very persistent in the environment.
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