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Ecotoxicological information

Short-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. 
Results of 5 tests with Daphnia magna were seen as valid. The geomean LC50 of those 5 studies was 1.14 mg CdTe/L.. This value will be used for classification.
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

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
1.14 mg/L

Additional information

In total 6 experiments were done using Daphnia magna as a test species and CdTe as toxicant.

 Test LC50 (mg CdTe/L)   reference
 DAC 12 003 0.4  Vito (2012a) 
 DAC 12 003 herhaling >2.2  Vito (2012b) 
 DAC 12 003 herhaling 2 1.11  Vito (2012a) 
 DAC 12 003 herhaling 3 0.57  Vito (2012a) 
DAC 12 003 herhaling 4  1.01  Vito (2012a) 
 DAC 12 003 herhaling 5 3.53  Vito (2012a) 

The result of DAC 12 003 herhaling 4 was not used in the final deriviation of the geomean LC50. This study was performed in an algal medium and was not considered valid.

The geomean of the other 5 studies was 1.14 mg CdTe/L.

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