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Toxicity to soil macroorganisms except arthropods

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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 9.4