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Toxicity to soil microorganisms

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Description of key information

Toxicity to soil microorganisms - waiver

Key value for chemical safety assessment

Short-term EC50 for soil microorganisms:
1 010 mg/kg soil dw

Additional information

This study is read across to Phenol, isopropylated, phosphate (3:1); CAS No 68937-41-7; EC No 273-066-3.

The long-term effects on nitrogen transformation activity of soil microorganisms were minimal at concentrations 10, 32, 100, and 318 mg/kg dry soil. There was an observed effect of the substance on nitrogen transformation activity of soil microorganisms at concentration level 1010 mg/kg dry soil. After 28 days of exposure, the mean nitrate concentration in soil treated at 10, 32, 100, 318, and 1010 mg/kg dry soil exhibited a -1%, 1%, 0%, 2%, and 23% reduction in nitrate formation, respectively, compared to the controls. The EC10 was calculated to be 582.7 mg/L using linear interpolation between concentrations 318 and 1010 mg/L. The EC25 and EC50 were estimated to be >1010 mg/L, the highest concentration tested.

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