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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Toxicity to microorganisms

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Administrative data

Link to relevant study record(s)

Description of key information

In an OECD guideline study, Yttrium oxide, europium doped did not show toxicity to micro-organisms up to 1000 mg/L. 

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
1 000 mg/L

Additional information

The toxicity of Yttrium oxide, europium-doped to microorganisms was determined in a 3 h activated sludge respiration inhibition study carried out according to OECD guideline No. 209 and GLP principles. Microorganisms in activated sludge were exposed to the test substance at a loading rate of 10, 100 and 1000 mg/L, under static conditions in a combined limit/range-finding test. Under test conditions Yttrium oxide, europium-doped was not toxic to microorganisms at or below a loading rate of 1000 mg/L (NOEC). The EC50 exceeded a loading rate of 1000 mg/L. All criteria for acceptability of the test were met and this study was considered to be valid.