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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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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. 
The toxicity of CdTe on Pseudokirchnierella was derived using a DA solution. The LC50 derived was 3.1 mg CdTe/L. This endpoint will be used for classification. However, 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

EC50 for freshwater algae:
3.1 mg/L
EC10 or NOEC for freshwater algae:
0.37 mg/L

Additional information

Two tests were performed using Pseudokirchneriella subcapitata as test species. However, high pH levels were noted in the algae 12 003 record (Vito 2012e). Therefore, the EC50 of the ALGE 12003 herhaling 2 (Vito 2012d) was used. A LC50 of 3.1 mg CdTe/L was determined.

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