Registration Dossier
Registration Dossier
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EC number: 219-323-5 | CAS number: 2414-98-4
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Magnesium ethanolate hydrolyses rapidly in contact with moisture or water (t1/2<1 minute) into ethanol and magnesium hydroxide (detailed description in section 5.1.2). Valid short-term toxicity data for algae are available for the hydrolysis products ethanol and magnesium hydroxide and magnesium ethanolate can be evaluated with respect to short-term toxicity to aquatic algae and cyanobacteria.
Hydrolysis product ethanol
A large amount of data on the toxicity of ethanol is available for a broad spectrum of aquatic organisms. The results from the most reliable and relevant available studies to toxicity of algae showed EC50 values above 10000 mg/l.
Long-term toxicity is unlikely as ethanol is readily biodegradable.
Hydrolysis product magnesium hydroxide:
The outcome of the studies showed that magnesium hydroxide has a low toxicity to algae. Magnesium sulphate and magnesium chloride, and hence the magnesium ion, all have a very low toxicity to aquatic organisms. The studies for this endpoint concluded that the EC50s for algae of magnesium hydroxide is above 100 mg/l.
Long-term toxicity is unlikely to occur based on the physico-chemical properties of magnesium hydroxide (low water solubility) and the breakdown pathway of the substance. Magnesium hydroxide is expected to break down in the environment to water and magnesium over time. Magnesium is ubiquitous in the environment and is an essential plant and animal nutrient.
All available data of ethanol and magnesium hydroxide demonstrated low toxicity to aquatic algae and it can be concluded that no classification is required for magnesium ethanolate.
Key value for chemical safety assessment
Additional information
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