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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

The test substance did not cause adverse effects on nitrate production in soil with a test material containing > 25% of CAS 597-82-0. In the absence of further data the results were extrapolated to the concentration of CAS 597-82-0 as worst case.

Key value for chemical safety assessment

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

Additional information

The toxicity to soil microorganisms was determined in a study according to OECD guideline No 216 with O,O,O-triphenylphosphorotioate in a lower purity (purity > 25%) and in compliance with GLP criteria. In this 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. 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. No adverse effects were observed.

The study was performed with an organic carbon content in soil of 2.4%.

In the absence of further data the results were extrapolated to the concentration of CAS 597 -82 -0 as worst case: NOEC = 250mg/kg dw