Registration Dossier
Registration Dossier
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EC number: 239-620-3 | CAS number: 15571-48-9
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Magnesium isopropanolate hydrolyses rapidly in contact with moisture or water into isopropanol and magnesium hydroxide. Both hydrolysis products are natural occuring substances and according to the available data are not dangerous for aquatic organisms and no classification is required.
Hydrolysis Product: Isopropanol: In three key studies according to national acceptable standard methods with Scenedesmus quadricauda a Toxic Threshold value of 1800 mg/l was determined. In a supporting study with Microcystis aeruginosa a Toxic Threshold of 1000 mg/l was observed.
According to the available data, the hydrolysis product isopropanol can be considered as not harmful to aquatic algae
Hydrolysis product magnesium hydroxide:
The key study concluded that Magnesium hydroxide slightly reduced growth rate and inhibited the yield of this fresh water algae species at 100 mg/l, being the highest test concentration. In conclusion, both the EC50 for growth rate reduction (ErC50: 0-72h) and the EC50 for yield inhibition (EyC50:0-72h) exceeded an analytically confirmed concentration of 100 mg/l.
The supporting study concludes that the Magnesium ion was tolerated extremely well by Chlorella vulgaris. This may be influenced by the fact that magnesium is the central atom in the chlorophyll molecule. 56 ions were tested for the tolerance of Chlorella towards them, and it was found that magnesium had the lowest inhibitory effect.
According to the available data, the hydrolysis product magnesium hydroxide can be considered as not harmful to aquatic algae .
Key value for chemical safety assessment
Additional information
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