Registration Dossier
Registration Dossier
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EC number: 304-802-4 | CAS number: 94279-56-8
Toxicity to soil macroorganisms except arthropods
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
This substance is a UVCB characterised as Silicic acid (H4SiO4), zirconium(4+) salt (1:1), reaction products with sodium hydroxide (304-802-4, 94279-56-8). It is the product of a reaction between Zircon (EC no 239-019-6) and sodium hydroxide. In accordance with column 2 of REACH Annex IX, toxicity testing with terrestrial organisms depends on the outcome of the chemical safety assessment using PNECs derived based on equilibrium partitioning. Neither the silicate part of the molecule (based on data for silicic acid, potassium salt, 215-199-1), nor the zirconium part (based on data for zirconium dichloride oxide, 231-717-9) elicits any environmentally relevant adverse response in aquatic organisms; no PNEC was derived for the aquatic compartment. As a result no PNEC could be derived for the terrestrial compartment. Overall, because of its transformation to insoluble zirconium compounds in the environment, which are not toxic, no chemical safety assessment needs to be performed for silicic acid (H4SiO4), zirconium(4+) salt (1:1), reaction products with sodium hydroxide. Therefore, no refinement of the hazard assessment is required and hence no toxicity testing with terrestrial organisms is needed (short-term (Annex IX) or long-term (Annex X)).
The above should be considered as an expert statement to waive the requirement for actual testing for long-term toxicity to terrestrial arthropods under REACH Annex IX for endpoint 9.4Information 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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