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Ecotoxicological information

Long-term toxicity to fish

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Description of key information

NOEC (21d) = based on sluble Lanthanum ions 0.26 mg/L for Cyprinus carpio. This concentration is higher than the water solubility of lanthanum oxide. Therefore no toxicity to fish is expected for lanthanum oxide at the saturation concentration in this assay. 

Key value for chemical safety assessment

Additional information

One chronic toxicity study on fish was available for Lanthanum trichloride hydrate according to Guideline OECD 204 using Cyprinus carpio as test species. A NOEC (21 d) of 0.26 mg La/L was determined. The concentration of 0.26 mg La would correspond to a concentration of 0.3 mg/L of Lanthanum oxide. Given the low water solubility of lanthanum oxide of 69.6 micro-g/L (at pH 6.29 to 6.85) it can reasonably be asumed that the Lanthanum oxide concentration at saturation in this test system would be below the NOEC of the lanthanum ion and Lanthanumoxide would no excert any toxicity to fish at the water solubility limit under the conditions of this test.

Toxicity data for marine species are not available.