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Ecotoxicological information

Long-term toxicity to fish

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Description of key information

For assessing the aquatic hazard of CdSSe, 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 CdSSe is even much lower than the solubility of Cd from CdTe (>100 times lower solubility of Cd in CdSSe, as compared to solubility in CdTe). The ecotoxicity of CdTe was therefore used as a worst case for the ecotoxicity of CdSSe.The long-term toxicity to fish was waived as acute testing with CdTe on fish did not show toxicity at 1g CdTe/L. However, as Cd2+ ion determines ecotoxicity the PNEC deriviation will be based on the Cd2+ion as determined in the RA (2008). 

Key value for chemical safety assessment

Additional information

The long-term toxicity to fish was waived as acute testing with CdTe on fish did not show toxicity at 1g CdTe/l, while some toxicity was observed in acute tests with algae and invertebrates. This observation, combined with the knowledge that invertebrates are the most sensitive taxonomic group for the Cd ion, as follows from the extensive database on chronic toxicity of soluble Cd compounds (invertebrates mean toxicity 3.04µg Cd/l (22 species NOECs, lowest value 0.21µg/l; fish mean toxicity 10.8µg Cd/l (18 species NOECs, lowest value 0.47µg/l; algae mean toxicity 9.13µg Cd/l (8 species NOECs, lowest value 0.85µg/l) justifies to waive the chronic fish test.