Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

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