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Short-term toxicity to fish

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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.

The potential for acute toxicity of magnesium to fish is low based on EC50 values for different freshwater and marine species being above the OECD 203 test limit of 100 mg/L and the fact that magnesium is added to standard test media. Based on OECD TG 203 conform studies of analogous substances (sodium 2-ethylhexanoate), an 96-h LC50 of > 100 mg/L was derived for the freshwater fish species O. latipedes. Further studies on 2-ethylhexanoate, performed equivalent or similar to OECD TG 203 with the freshwater fish species Oncorhynchus mykiss, Lepomis gibbosus and Leuciscus idus resulted in 96-h LC50 values > 100 mg/L, respectively. Thus, magnesium 2-ethylhexanoate has a very low potential for short-term toxicity to fish.

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