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On the basis of ecotoxicity studies on elemental strontium concentrations and related soluble substances (assessment entities), reliable aquatic toxicity data of strontium and strontium substances are available from GLP-conform guideline studies for algae, daphnia, fish and microorganisms.

Reliable acute data are available for three trophic levels: algae, invertebrates and fish

- An unbounded ErC50 value of > 47.1 mg Sr/L was identified for the growth rate of algae (Pseudokirchneriella subcapitata)

- An unbounded value of > 56.3 mg Sr/L and a bounded acute value of 125 mg Sr/L were identified for the freshwater invertebrate species Daphnia magna with the latter being well above the OECD test limit.

- An unbounded value of > 56.34 mg Sr/L was identified for the freshwater fish species Danio rerio

- An unbounded value of > 92.8 mg Sr/L (96h-LC50) was identified for the saltwater fish species Morone saxatilis

- An unbounded value of > 163.8 mg Sr/L (3 -h EC10) was derived for microorganisms (activated sludge)

Reliable chronic data are available for two trophic levels: algae and invertebrates.

- An ErC10 value of 24.3 mg Sr/L was identified for the growth rate of algae (Pseudokirchneriella subcapitata)

- A chronic value of 21 mg Sr/L is available for the invertebrate Daphnia magna.

 

In sum, strontium is not acutely and chronically toxic to aquatic freshwater organisms since measured endpoints are unbounded or above the OECD test limit.

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