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Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

Aquatic toxicity data available on reaction mass of cerium dioxide and lanthanum oxide and lanthanum fluoride and its constituents are shown in the table below:

Endpoints

Reaction mass

Cerium dioxide

Lanthanum oxide

Lanthanum fluoride

Short-term toxicity to fish

96h-LL50 (O. mykiss)

> 100 mg/L

96h-LL50 (B. rerio) > 100 mg/L

96h-LL50 (B. rerio)

> 100 mg/L

-

Long- term toxicity to fish

Waived as scientifically unjustified

-

-

Short-term toxicity to daphnids

48h-EL50 (D. magna)

> 100 mg/L

48h-EL50 (D. magna) > 100 mg/L

48h-EC50 (D. magna) > 100% saturated solution in cerium dioxide

48h-EC50 (D. magna)

> 1000 mg/L

48h-EL50 (D. magna)

> 100 mg/L

-

Long- term toxicity to daphnids

-

22d-NOEL (D. magna) ≥ 100 mg/L

21d-NOEL (D. magna)

≥ 100 mg/L

-

Algal toxicity

72h-EL50 (S. subspicatus)

> 100 mg/L

72h-EL50 (S. subspicatus)

> 100 mg/L

72h-NOEC (P. subcapitata)

> 1000 mg/L

-

-

Toxicity to aquatic micro-organisms

-

3h-EC50 (activated sludge)

> 1000 mg/L

-

-

These data clearly show that reaction mass and its constituents present highly similar properties in terms of aquatic ecotoxicity; supporting the relevance of potential read-across with constituents when data on reaction mass are not available.