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Toxicity to aquatic algae and cyanobacteria

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Metal carboxylates such as strontium 2-ethylhexanoate are substances consisting of a metal cation and a carboxylic acid anion which, upon dissolution, determine the aquatic toxicity. The toxicity of strontium ions to aquatic algae and cyanobacteria was determined by Wenzel (2015) according to OECD 201, yielding a NOErC, ErC10 and ErC50 of 18.8, 24.3 and > 47 mg / L strontium for Pseudokirchneriella subcapitata, respectively. Supporting toxicity studies further report NOEC values well above 100 mg strontium/L. Thus, strontium has a low potential for toxicity to aquatic algae and cyanobacteria. Regarding the 2-ethylhexanoic acid anion, studies on the alga Scenedesmus subspicatus (new name: Desmodesmus subspicatus) revealed an EC50 (72h) of 49.3 mg/L. Thus, strontium 2-ethylhexanoate appears to have some potential for toxicity to aquatic algae and cyanobacteria.

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