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Long-term toxicity to aquatic invertebrates

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Aluminum zirconium chloride hydroxide is an inorganic substance which will rapidly dissociate into aluminum, zirconium, chloride and hydroxide ions upon dissolution in the environment. However, zirconium ions will not remain as such in solution, and the environmental toxicity (if any) will not be driven by zirconium. Therefore, full read-across to other aluminum substances considering a typical aluminum content of ca. 19.4% is justified. However, reliable long-term toxicity data based on dissolved aluminum concentrations are not available for aquatic invertebrates. 

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Aluminum zirconium chloride hydroxide is an inorganic substance which will rapidly dissociate into aluminum, zirconium, chloride and hydroxide ions upon dissolution in the environment. However, zirconium ions will not remain as such in solution. Thus, regarding the environmental fate and toxicity of Aluminum zirconium chloride hydroxide, it can be assumed that environmental fate and toxicity (if any) will not be driven by zirconium. Therefore, full read-across to other aluminum substances considering a typical aluminum content of ca. 19.4% isjustified. Reliable long-term toxicity data are not available for aquatic invertebrates. Three reproduction tests (reliable with restrictions) with Ceriodaphnia dubia report EC25 values ranging from 0.5 to 0.6 mg/L (nominal Al) and a NOEC of 0.47 mg/L (nominal Al). However, dissolved aluminum concentrations were not measured in these tests.