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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Description of key information

(28-d) NOEC ≥1000 mg/kg dw E. foetida (read-across, reliability 2)

Key value for chemical safety assessment

Short-term EC50 or LC50 for soil macroorganisms:
1 000 mg/kg soil dw
Long-term EC10, LC10 or NOEC for soil macroorganisms:
1 000 mg/kg soil dw

Additional information

An acute earthworm toxicity study is available for GTL Gasoil (Priestly, 2010b). The test was conducted in accordance with OECD 207 and GLP, however no analytical monitoring of the test substance in the exposure medium was carried out. Earthworms (Eisenia foetida) were exposed to a single concentration of GTL Gasoil at a nominal loading rate of 1000 mg/kg of soil (dry weight) for a period of 14 days. There were no significant mortalities or sub-lethal effects observed during the 14-day exposure period.

The 14-d acute LC50for earthworms was therefore determined to be greater than 1000 mg/kg dw.

A short-term earthworm toxicity study is available for GTL Base Oil Distillates (Priestly, 2010b). The test was conducted in accordance with OECD 207 and GLP. Earthworms (Eisenia foetida) were exposed to a single concentration of GTL Base Oil Distillates at a nominal loading rate of 1000 mg/kg of soil (dry weight) for a period of 14 days in artificial soil. There were no significant mortalities or sub-lethal effects during the 14-day exposure period. The 14-d acute LC50for earthworms was therefore determined to be greater than 1000 mg/kg dw.

In addition, an earthworm reproduction study, conducted in accordance with OECD 222 and GLP has also been performed with GTL Gasoil (Schmidt, 2011a). No analytical monitoring was carried out. Adult earthworms were exposed in treated soils for a period of four weeks, at test concentrations of 10, 32, 100, 320, and 1000 mg per kg dry soil. Additionally, a control and a reference item treatment were tested in parallel. After this period, the adults were removed from the test vessels and the survival and growth rate were determined. The cocoons and juvenile earthworms remained in the vessels for additional four weeks. The reproduction rate was determined by counting the number of offspring hatched from the cocoons after this additional test period of four weeks.The NOEC of this study based on survival, growth and reproduction parameters was at least 1000 mg/kg dw. A LOEC could not be established due to the absence of adverse effects at the highest dose level.

A long-term toxicity study with E. foetida has been conducted with Base Oil Distillates (Schmidt, 2011b) in accordance with GLP and OECD 222. Adult test organisms were exposed to 10, 32, 100, 320 and 1000 mg/kg dw soil for 4 weeks and then removed, while the juvenile earthworms remained in the vessels for an additional 4 weeks. Adult mortality and mean change in body weight were recorded, as well as mean reproduction rate of juveniles. Based on these parameters an LC50and a LOEC could not be determined and a NOEC of at least 1000 mg/kg dw has been determined.

Conclusion

Short and long-term soil macroorganism toxicity data are available for two GTL-derived substances in the relevant carbon number range for Hydrocarbons, C16-C22, n-alkanes, isoalkanes, <2% aromatics. In the absence of adverse effects in any of these studies, based on weight of evidence it can be concluded that the NOEC for the registered substance is ≥1000 mg/kg dw soil.