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Ecotoxicological information

Toxicity to terrestrial plants

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Description of key information

No toxic effects could be observed in a toxicity study with terrestrial plants.

Key value for chemical safety assessment

Additional information

The phytotoxicity of the test item 2-(2H-benzotriazol-2-yl)-p-cresol to six terrestrial plant species was determined according to OECD 208 (July 2006) in seedling emergence and seedling growth tests over a period of 21 days. For onion 50 % emergence of the control seedlings was reached after 14 days. Therefore, the test for onion was prolonged until day 28. Test systems comprised two monocotyledons (oats, Poaceae; onion, Liliaceae), and four dicotyledons (sugar beet, Amaranthaceae; rape, Brassicaceae; lettuce, Asteraceae; soybean, Fabaceae). The test was conducted with the test concentrations of 1000 - 500 - 250 - 125 - 62.5 mg/kg DW (factor 2). The test item was incorporated into the soil in which the seeds were sown. The test containers were bottom watered with nutrient solution as needed. Potential toxic effects of the test item were assessed on day 7, 14 and 21 (onion additionally on day 28) by visual observations (number of emerged seedlings and phytotoxic effects) and at test end by shoot height and shoot fresh weight determination. No test item related phytotoxic effects and mortality occurred during the test period for all plant species. The respective NOEC values are all≥1000 mg/kg dw.

 

The results of the control for all plant species met the required validity criteria. Therefore, the test is considered to be valid.