Registration Dossier

Ecotoxicological information

Toxicity to soil microorganisms

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

No toxic effects could be observed in a toxicity study to soil microorganisms.

Key value for chemical safety assessment

Additional information

In a 28-day toxicity study, natural soil was exposed to 2-(2H-benzotriazol-2-yl)-p-cresol at nominal concentrations of 0 (blank control), 62.5 mg/kg, 125 mg/kg, 250 mg/kg, 500 mg/kg and 1000 mg/kg (dry weight) under conditions in accordance with the guidelines. Luzerne meal was used as nitrogen source. The moistness, pH and temperature were within acceptable guideline specifications. The amount of nitrate formed by microbial processes was determined at start of exposure, after 7, 14 and after 28 days at the end of exposure. The results of the nitrate analyses of the treated replicates were compared to control assays and the nitrate production in the treated replicates was expressed as an inhibition of the process of nitrogen oxidation. The EC10, EC25 and EC50 values were estimated to be >1000 mg/kg dry weight. The results in this study are consistent with all validity criteria and the test is valid according to the guidelines of this study.