Registration Dossier
Registration Dossier
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EC number: 215-170-3 | CAS number: 1309-42-8
Long-term toxicity to fish
Administrative data
Link to relevant study record(s)
- Endpoint:
- fish early-life stage toxicity
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- other:
Reference
Description of key information
Long-term toxicity of fish is unlikely to occur based on the physico-chemical properties of magnesium hydroxide, the breakdown pathway of the substance and the fact that magnesium ions are ubiquitous in the natural environment. Therefore, according to REACH Annex IX, 9.1., column 2 there is no need to investigate further on the effects on aquatic organisms.
Key value for chemical safety assessment
Additional information
Magnesium hydroxide is of low acute toxicity to aquatic organisms and does not meet the criteria to be classified as dangerous under the CLP Regulation (EC) No 1272/2008 nor does it meet the criteria to be classified as persistent, bioaccumulative or toxic under the REACH Regulation.
Reported results on the physico-chemical properties of Magnesium hydroxide show that the substance is only slightly soluble in water (1.78 mg total solids/L at 8.3 pH and 20ºC) and has a low potential to adsorb to sediment (derived sediment-water partition coefficient (Kd) 1.65). Furthermore, 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.
Furthermore, Magnesium hydroxide is only slightly soluble in water (1.78 x 10mg total solids/L at 8.3 pH and 20.3ºC) and therefore aquatic plants are unlikely to be exposed to the substance.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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