Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
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.
Information 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.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
Sellel veebilehel kasutatakse küpsiseid, et tagada lehe parim kasutus.
Welcome to the ECHA website. This site is not fully supported in Internet Explorer 7 (and earlier versions). Please upgrade your Internet Explorer to a newer version.
Do not show this message again