Registration Dossier
Registration Dossier
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EC number: 208-048-6 | CAS number: 506-64-9
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.04 µg/L
- Assessment factor:
- 3
- Extrapolation method:
- sensitivity distribution
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.86 µg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 0.025 mg/L
- Assessment factor:
- 1
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 438 mg/kg sediment dw
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 438 mg/kg sediment dw
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 1.41 mg/kg soil dw
- Assessment factor:
- 3
- Extrapolation method:
- sensitivity distribution
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
For silver cyanide, it is likely that the cyanide component will be degraded in STP, and the silver released to the environment from the silver cyanide complex will behave in a similar manner to ionic silver in the environment. Therefore, PNEC values for silver cyanide are read across from the ionic silver REACH dossier.
Conclusion on classification
Experimental ecotoxicity data are not available for silver cyanide, but there is a large amount of data available for the components of the substance (silver and free cyanide). Therefore, in order to minimise unnecessary testing, a calculation approach was used for determining the toxicity of silver cyanide to fish, invertebrates, algae and microorganisms using the extensive information that already exists on the toxicity of the metal ion and free cyanide, and on the speciation of silver cyanide in ecotoxicity test solutions.
The most sensitive endpoint was determined to be Daphnia, with a calculated EC50 of 0.00056 mg/L (wca 2012). The calculated EC50 for the most sensitive trophic level is ≤ 1 mg/L, therefore the test item is classified as hazardous to the aquatic environment with Acute Category 1, and an M-factor of 1000. The acute data has also been considered for assessing the long-term aquatic hazard. Therefore, based on the toxicity data, the test item is classified as Category Chronic 1, with M-factor of 100.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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