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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

Two studies were conducted to assess the effects of Alkenes, C11-12, hydroformylation products, distn. residues on the carbon (OECD 217) and nitrogen (OECD 216) transformation activity, respectively, of soil microorganisms in aerobic surface soils. 

Key value for chemical safety assessment

Short-term EC50 for soil microorganisms:
810 mg/kg soil dw
Long-term EC10 or NOEC for soil microorganisms:
466.87 mg/kg soil dw

Additional information

Regarding the carbon transformation study, after 28 days, an inhibitory dose response effect was not observed for the treatment groups when compared to the untreated control group. The EC50 value for inhibition of soil respiration after 28 days was greater than 810 mg Alkenes, C11-12, hydroformylation products, distn. residues/kg dry soil (the highest concentration tested). The EC25 value for inhibition of soil respiration after 28 days was greater than 810 mg Alkenes, C11-12, hydroformylation products, distn. residues/kg dry soil (the highest concentration tested). The EC10 value for inhibition of soil respiration after 28 days was greater than 810 mg Alkenes, C11-12, hydroformylation products, distn. residues/kg dry soil (the highest concentration tested).

Regarding the nitrogen transformation study, the calculated EC50 value for inhibition of nitrate formation after 28 days was greater than 810 mg Alkenes, C11-12, hydroformylation products, distn. residues /kg dry soil (the highest concentration tested). The EC25 value for inhibition of nitrate formation after 28 days was 772.86 mg/kg with 95% confidence limits of 699.68 mg/kg and 853.69 mg/kg. The EC10 value for inhibition of nitrate formation after 28 days was 466.87 mg/kg with 95% confidence limits of 338.06 mg/kg and 644.91 mg/kg.