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Ecotoxicological information

Long-term toxicity to aquatic invertebrates

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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.  
Only one test was available with Daphnia magna as test organism and CdTe as toxicant. The NOEC was 0.2 mg CdTe/L. No marine data was available.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
0.2 mg/L

Additional information

The water soluble fraction of CdTe after DA was toxic to Daphnia. NOEC and LOEC for reproduction and mortality was 0.2 and 0.29 mg CdTe/L respectively. This is also the EC50 range for effects on reproduction.

As Cd2+ ion determines ecotoxicity, the PNEC deriviation will be based on the Cd 2+ ion as determined in the RA (2008).