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EC number: 233-038-3 | CAS number: 10025-73-7
Toxicity to soil macroorganisms except arthropods
Administrative data
Link to relevant study record(s)
Description of key information
The LC 50 value of Cr(III) was 1635 in the organic substrate (4979 mg CrCl3/kg dw).
Key value for chemical safety assessment
- Short-term EC50 or LC50 for soil macroorganisms:
- 4 979 mg/kg soil dw
Additional information
A short-term study was conducted to evaluate the effects of Cr(III) (applied as chromium trichloride) on the survival, behaviour, and morphology of the earthworm, Eisenia fetida, in water at pH 6, 7, and 8 and their toxicity in 10 different soils and an organic substrate. Six concentrations of 500, 1000, 1500, 2000, 2500, and 3000 mg Cr/kg were applied to the test animals in the definitive test. The 14-day LC50 values of Cr(III) in all soils ranged from 1656 mg/kg to 1902 mg Cr/kg at pH 6, 7 and 8. The LC50 value of Cr(III) was 1635 mg/kg in the organic substrate (LC50 of 4979 mg/kg soil dw based on chromium trichloride). Changes were not observed in the morphology of earthworms and in their burrowing behaviour in both soil and organic media at all test concentrations. The soil variables that showed significant correlations with LC50 values were considered in the development of regression equations. The equations showed that clay alone accounted for 92% of the variation in the toxicity (LC50 values) of Cr(III).
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