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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Description of key information

The study conducted with TBHP 70% (following the OECD 207 guideline and GLP) on earthworms (Eisenia fetida) for acute toxicity provided a 14-day LC50 value of 166 mg product/kg dry soil (based on mortality). 

Key value for chemical safety assessment

Short-term EC50 or LC50 for soil macroorganisms:
166 mg/kg soil dw

Additional information

There was 10 and 12.5% mortality in the TBHP 70% treatment rates of 111.11 mg product/kg dry soil on Day 7 and 14 respectively and 100% mortality at 333.3 and 1000 mg product/kg dry soil on Day 7.The 14-day LC50 value was 166 mg product/kg dry soil with 95% confidence limits of 111 – 177 mg product/kg dry soil. The No observed Effect Concentration (NOEC) based on mortality was 37.04 mg product/kg dry soil.

There were no significant treatment related differences in bodyweight of surviving earthworms between the treatment and control groups. The NOEC for this parameter was 111.11 mg product/ kg dry soil as there were no surviving earthworms at 333.33 and 1000 mg product/kg dry soil.

The 14 -day LC50 value of 166 mg product/kg dry soil will be used as the value for the chemical safety assessment of TBHP to the toxicity of soil macro-organisms (excluding arthropods).