Registration Dossier
Registration Dossier
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EC number: 240-926-4 | CAS number: 16891-37-5
Short-term toxicity to fish
Administrative data
Link to relevant study record(s)
Description of key information
Magnesium diethyl dicarbonate hydrolyses rapidly in contact with moisture or water (t1/2<1 minute) into carbon dioxide, ethanol and magnesium hydroxide (detailed description in section 5.1.2). Carbon dioxide is a natural gas. Valid short-term toxicity data for fish are available for the hydrolysis products ethanol and magnesium hydroxide and magnesium diethyl dicarbamate can be evaluated with respect to short-term toxicity to fish.
Both hydrolysis products are natural occurring substances and according to the available data are not dangerous for aquatic organisms and no classification is required.
Hydrolysis product magnesium hydroxide:
Five studies were carried out on the short-term toxicity to fish. The supporting studies all concluded that Magnesium has no short-term toxicity to fish. One study, on the effect of magnesium cation on survival of brown trout at low pH, concluded that the magnesium ion does not affect the survival rate. Other supporting study, on the acute toxicity of magnesium sulphate to bluegill fish, concludes that magnesium sulphate has a very low toxicity to Lepomis macrochirus. A supporting study, on the short-term toxicity of magnesium chloride and magnesium sulphate to Pimephales promelas, concluded that magnesium sulphate and magnesium chloride, and hence the magnesium ion, have a very low toxicity to Pimephales promelas.
From the key studies, the recalculated LC50 (96h) of P.Promelas was determined to be 306.79 mg/L for freshwater fish.
According to the available data, the hydrolysis product magnesium hydroxide can be considered as not acutely harmful to fish.
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 acute toxicity to fish showed LC50 values above 10000 mg/l. According to the available data, the hydrolysis product ethanol can be considered as not acutely harmful to fish.
Long-term toxicity is unlikely as ethanol is readily biodegradable.
Key value for chemical safety assessment
Additional information
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