Registration Dossier
Registration Dossier
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EC number: 219-641-4 | CAS number: 2489-05-6
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- no hazard identified
Marine water
- Hazard assessment conclusion:
- no hazard identified
STP
- Hazard assessment conclusion:
- no hazard identified
Sediment (freshwater)
- Hazard assessment conclusion:
- no hazard identified
Sediment (marine water)
- Hazard assessment conclusion:
- no hazard identified
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- no hazard identified
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
In the assessment of the ecotoxicity of silver behenate, a read-across approach from data for the metal cation and the organic anion is followed. This read-across strategy is based upon the assumption that upon release to the environment and dissolution in aqueous media, silver behenate will completely dissociate and only be present in its dissociated form, i.e. as silver cation and behenate anion.
Transformation dissolution test demonstrates that substance is slightly soluble. When dissolved, the substance dissociates in water in Ag and behenate to levels above the ecotoxicity reference value. Upon dissolution and dissociation of silver behenate into silver and behenate, both constituent ions will each show its proper (bio)degradation, bioaccumulation and partitioning behavior in the environment. The environmental fate and behavior for the metal and organic moieties is predicted to be clearly different from each other, resulting in a different relative distribution over the environmental compartments (water, air, sediment and soil). The exposure and risk assessment is conducted on the metal and organic part separately. The PNEC values for both parts are reported.
Conclusion on classification
The classification and labeling guidance states that if the solubility of a metal compound is greater than the L(E) C50 then it should be classified for acute and chronic hazard based on the available ecotoxicity data and the standard classification criteria. This substance has a measured solubility greater than the acute ecotoxicity reference value of EC50 of 0.22 µg Ag/L and is therefore considered a soluble form.
This acute ecotoxicity reference value results in a classification of Acute and Chronic Category 1 under the CLP Regulations. Under the CLP Regulations an M factor must also be assigned to substances classified as Acute Category 1, Chronic Category 1. Based on the Regulations the acute M factor for this substance is 1000 for acute.
On 10thMarch 2011 Commission Regulation (EC) No 1272/2008 [CLP Regulations] was amended for the second time. The acute environmental classification is still based on acute data. However, the chronic environmental classification is now based on a chronic data set, if this is available. A complete chronic data set is available for silver.
A number of chronic ecotoxicity studies are available for fish, invertebrates and algae for soluble silver substances. The lowest reliable chronic value is an EC10 of 0.16 µg Ag/L for silver chloride toxicity to the algae Nostoc muscorum (Rai et al. 1990). This result confirms the chronic classification of this substance under the CLP Regulations. Under the CLP Regulations a chronic M factor must also be assigned to substances classified as Chronic Category 1. Based on the Regulations the chronic M factor for this substance is 100.
The dissolution level measured with the screening transformation dissolution at pH 6 is higher than the respective ecotoxicity reference values. Therefore, the substance is classified Acute 1, Chronic 1.
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