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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

In a 28-day toxicity study, natural soil was exposed to the test substance at nominal concentrations of 0 (control), 62.5, 125, 250, 500 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. On day 28 the EC10 and EC50 values were determined to be >1000 mg/kg dry weight. The results in this study are consistent with all relevant validity criteria and the test is valid according to the guidelines of this study.

Key value for chemical safety assessment

Long-term EC10 or NOEC for soil microorganisms:
1 000 mg/kg soil dw

Additional information