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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

A 42-day soil toxicity test was carried out to investigate the long-term effects of the registered substance, the rection products of 1-decene, 1-dodecene and 1-octene, hydrogenated, on the nitrogen transformation activity of soil microorganisms.  Results from the study indicated that the registered substance caused no long-term adverse effect to soil micro-organisms under the conditions of the OECD 216 test, at soil concentration of 100 mg/kg (dw).  

Key value for chemical safety assessment

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

Additional information

In a GLP study conducted according to OECD 216 guidelines, the registered substance was evaluated at soil concentrations of 0, 1, 10 and 100 mg/kg dry weight (d.w.) to determine the effect on the transformation of an organic nitrogen source (lucerne) to nitrate over a period of 42 days in soil micro-organisms. No statistically significant difference in the 0 -42 day nitrate formation rate was seen in the 1, 10 or 100 mg/kg soil dw concentration group compared to that in the control soil group, indicating that the 42 -day no-observed-effect concentration (NOEC) was > 100 mg/kg (dw). The 42 -day EC50 was also >100 mg/kg (dw). There was no dose-response over the exposure levels investigated. In summary, the registered substance showed no long-term effect to soil micro-organisms under the conditions of the OECD 216 test, even at the highest nominal soil concentration of 100 mg/kg (dw). Clearly these findings indicate that the registered substance is not expected to cause any long-term effects to soil microorganisms.