Registration Dossier
Registration Dossier
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EC number: 701-227-4 | CAS number: -
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
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 influence of CdTe on the respiration rate of activated sludge was investigated after a contact time of 3 hours. The EC50 derived was > 1 g CdTe/L. 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 microorganisms:
- 1 000 mg/L
- EC10 or NOEC for microorganisms:
- 100 mg/L
Additional information
Under the conditions of the activated sludge respiration inhibition test CdTe was not toxic to waste water (activated sludge) bacteria at or below a loading rate of 100 mg/L (NOEC). The EC50 derived was > 1 g CdTe/L. However, as Cd2+ ion determines ecotoxicity, the PNEC deriviation for STP will be based on the Cd 2+ ion as determined in the RA (2008).
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