Registration Dossier
Registration Dossier
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EC number: 945-888-9 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Two short-term toxicity tests on daphnia (Knauer 2016, section 6.1.3) and algae (Knauer 2016, section 6.1.5) with YbHfZrO2 did not reveal any adverse effects at nominal concentrations of 100 mg/L, toxic effects on other fish are as well not expected and are considered highly unlikely. Consequently, no aquatic hazards were identified in the CSA (no PNECs were derived). Following the provisions of column 2 of chapter 9.1 on aquatic toxicity in Annex IX of the REACH regulation, further aquatic long-term tests are not needed.
In addition, the only relevant chemical species of the substance is Yb as shown in the Transformation/Dissolution protocol (pH 8; ca. 22 °C; 7d; 100 mg/L loading): Yb is only released in the low μg/L range and is thus by far lower than the EC50 value of ~0.05 g/L reported for zebrafish embryos in the supporting study (Cui, et al., 2011).
Additional information
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.
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