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Ecotoxicological information

Long-term toxicity to fish

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Description of key information

No long-term toxicity to fish studies are available for magnesium carbonate and testing is considered scientifically unjustified.

Key value for chemical safety assessment

Additional information

Magnesium is present in all natural waters and is a major contributor to water hardness. Water from areas rich in magnesium-containing rocks may contain magnesium in the concentration range 10 to 50 mg/L. The sulfates and chlorides of magnesium are very soluble, and water in contact with such deposits may contain several hundred milligrams of magnesium per litre. This natural abundance of magnesium ions in the environment means that aquatic organisms including fish are constantly exposed to magnesium without suffering from any adverse or detrimental effects. Long-term toxicity testing of magnesium carbonate on fish is therefore scientifically unjustified.