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The aquatic toxicity of Lutetium-yttrium oxyorthosilicate, cerium doped has been assessed in an acute toxicity test with Daphnia magna (according to OECD test guideline 202) and on the freshwater algae Pseudokirchneriella subcapitata (according to OECD guideline No. 201).

According to the results of the test with Daphnia magna, the EL50(48 h) was determined to be 46.3 mg/L (nominal). The corresponding NOELR (48 h) was 20.7 mg/L (nominal).


Lutetium-yttrium oxyorthosilicate, cerium doped was tested on the freshwater algae Pseudokirchneriella subcapitata according to OECD guideline No. 201 and under GLP.

In the course of the test with freshwater algae, the tested concentrations were (nominal) 0.954, 3.05, 9.77, 31.3 and 100 mg/L (measured: 0.00216, 0.00570, 0.0216, 0.203, 0.663 mg test item/L). The result of the study was an ErC50 of 0.189 mg test item/L and a NOErC of 0.00216 mg test item/L based on the growth rate and measured test item concentrations.

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