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Ecotoxicological information

Toxicity to terrestrial arthropods

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Description of key information

For assessing the aquatic hazard of CdZnS, reference has been made to ecotoxicity data obtained by standard testing on CdTe, a sparingly soluble  Cd-compound. Transformation dissolution data demonstrate that the solubility of Cd in CdZnS is even much lower than the solubility of Cd from CdTe (>16-50 times lower solubility of Cd in CdZnS, as compared to solubility in CdTe). The ecotoxicity of CdTe was therefore used as a worst case for the ecotoxicity of CdZnS. 
An ecotoxicity study was performed with CdTe using Folsomia candida as test species. No effects were seen up to a concentration of 10 mg CdTe/kg DW.
As Cd2+ ion determines ecotoxicity, the PNEC deriviation will be based on the Cd 2+ ion as determined in the RA (2008).

Key value for chemical safety assessment

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

Additional information

Under the conditions of the study CdTe had no effect on reproduction of adult springtails (Folsomia candida) at 10 mg/kg dw (NOEC). The NOEC for mortality was 1000 mg/kg dw. The LC50 for mortality of adult springtails was beyond the range tested, i.e. exceeded 1000 mg/kg dw. The EC10 for reproduction was 11 mg/kg dw with a 95% CI between 0.63 -205 mg/kg dw. The EC50 for reproduction was beyond the range tested, ie exceeded 1000 mg/kg dw.