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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Description of key information

In reliable guideline compliant studies, 14 day NOEC values of the read-across substance in earthworms were 517 and 953 mg a.i./kg soil dw. The LC0 and LC50 values were > 517 and 7,070 mg a.i./kg soil dw, respectively.

Key value for chemical safety assessment

Short-term EC50 or LC50 for soil macroorganisms:
7 070 mg/kg soil dw
Long-term EC10, LC10 or NOEC for soil macroorganisms:
517 mg/kg soil dw

Additional information

A guideline study was conducted on earthworms. The read-across substance C12-C16 ADBAC was applied once at nominal concentrations of 100, 180, 320, 580 or 1000 mg/kg dw of artificial soil. No analytical determination was performed for the test substance. The individual live weights of the worms were reported after 14 days of exposure. Other effects (pathological symptoms, behaviour of the worms) were reported after 7 and 14 days of exposure. Results of the reference test with 2 -chloracetamide show that the method was sensitive and valid. The substance did not cause a change in behaviour, weight and mortality of the earthworm at any of the tested concentrations after 14 days of exposure. This was probably due to adsorption onto soil. The highest tested concentration without mortality and any other effects was 1,000 mg/kg dw. Under the study conditions, the 14 day NOEC was 1,000 mg/kg dw (equivalent to 517 mg/kg dw based on a.i.) and the LC0was > 1,000 mg/kg dw (> 517 mg/kg dw based on a.i.) (Noack M, 1999).

In another guideline study, the acute toxicity of the read-across substance C12-C16 ADBAC to the earthworm Eisenia foetida foetida in an artificial soil under laboratory conditions was determined. Six groups of forty worms (four replicates of ten) were allocated to an artificial soil containing 0, 953, 1,715, 3,086, 5,556 or 10,000 mg a.i./kg soil dw (nominal concentrations). No analytical determination was performed for the test substance. Mortality was recorded on Days 7 and 14. Worms were weighed at the beginning and end of the study. After 7 days, all worms at 10,000 and 2 worms at 5,556 mg a.i./kg soil dw were dead. By Day 14, one additional worm died at 5,556 mg a.i./kg soil dw. A treatment-related reduction in body weight was observed. Group mean body weights were affected by treatment with test substance at 1,715 mg a.i./kg soil dw and above. Under the conditions of this test, the 14 d LC50values of test substance for earthworm was 7,070 mg a.i./kg soil dw, respectively and the NOEC was 953 mg a.i./kg soil dw (Rodgers MH, 2004).