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Toxicity to aquatic algae and cyanobacteria

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In the assessment of magnesium 2-ethylhexanoate, read-across to the assessment entities soluble magnesium substances and 2-ethylhexanoic acid is applied since the ions of magnesium 2-ethylhexanoate determine its fate and toxicity in the environment.

Magnesium is an essential macronutrient for algae and cyanobacteria and as central element in chlorophyll essential for the process of photosynthesis, therefore being part of all aquatic algae test media (OECD TG 201, 2006) and of very low potential of toxicity. Toxicity of 2-ethylhexanoate to green alga was assessed in a non-GLP static test, yielding an 72-h EC50 of 49.3 mg/L as well as an 72-h EC10 of 32.0 mg/L. Thus, magnesium 2-ethylhexanoate has a low potential for toxicity to aquatic algae and cyanobacteria.

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