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EC number: 281-897-8
CAS number: 84057-80-7
Based on analysis of thermodynamic stability of aqueous zirconium species, the concentration of free Zr4+ ions under environmental conditions is barely detectable. Ionic zirconium (Zr4+) at relevant pH conditions (pH 7 - 8) of aquatic and terrestrial environments will rapidly transform to zirconium-oxide and -hydroxide complexes, precipitate and not be bioavailable to aquatic organisms. In accordance with REACH Annex VIII, 9.1.4 column 2, a study on toxicity to aquatic microorganisms does not need to be conducted if the substance is highly insoluble in water. Microorganisms in the STP will not be exposed to ZrO2, as it will either be removed in the primary settling tank before reaching the microorganisms, or it will not be bioavailable due to complexation. Furthermore ZrO2 is highly insoluble in water and consequently no study needs to be performed.
A standard activated sludge respiration inhibition study was still performed with zirconium acetate. No statistically significant toxic effects were observed at all test concentrations employed. The 3-h EC50 and NOEC were determined to be >1000 mg/L and ≥1000 mg/L anhydrous zirconium acetate, respectively, equivalent to >530 mg/L and ≥530 mg/L zirconium.
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