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EC number: 203-715-8 | CAS number: 109-88-6
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Endpoint summary
Administrative data
Description of key information
Magnesium methanolate decomposes very rapidly upon contact with water by hydrolysis. The environmental fate and pathways are determined by the degradation products methanol and magnesium hydroxide.
The hydrolysis product methanol is a naturally occuring substance and readily biodegradable in water, soil and sediments, both under aerobic and anaerobic conditions.
Compared to other loss mechanisms identified, including volatilization and chemical degradation, biodegradation is expected to be the dominant process controlling the fate of methanol in the soil, groundwater, and surface water environments
Methanol is degraded in the atmosphere by photochemical, hydroxyl-radical dependent reactions. The estimated elimination half-life is calculated to be about 17.2 days.
Due to the high solubility of methanol in water and its low octanol-water partition coefficient adsorption to soil is considered to be negligible. Given the value of the Henry's Law constant, once in water, methanol is likely to remain in the aqueous phase. No bioaccumulation is expected.
Hydrolysis product magnesium hydroxide:
Magnesium hydroxide is a naturally occuring mineral (Brucite)
The molecular structure of Magnesium hydroxide does not contain any hydrolysable functional groups and therefore, the test on the hydrolysis of Magnesium hydroxide could not be performed. The substance is an inorganic hydroxide and as such is not subject to biodegradation, the study is technical not feasible.
Magnesium hydroxide has a very low potential for adsorption to sediment based on a derived Kd value of 1.65. The Forum of European Geological Surveys (FOREGS) Geochemical Atlas of Europe ('Salminen, R. (ed.) 2005) [1]provided paired sediment-water concentrations of Magnesium and Magnesium oxide from which sediment partition coefficients (Kd values) could be derived.
The sediment-water partition coefficients were calculated for each of the pairs using the following equation:
Kd = Cs / Caq
Where Cs = the total concentration of the test substance in the solid phase (mg/kg) and Caq = concentration of test substance in aqueous phase (mg/L). The detection limit for Magnesium and Magnesium oxide in water was 0.001 mg/L.
The median Kd value along with the 10thand 90thpercentiles for the dataset are reported in Table 1.
Table4. Sediment-water partition coefficients (Kd) for Magnesium/Magnesium oxide compounds (L/kg)
Min |
Max |
Median |
10th Percentile |
90th Percentile |
|||||||
806 |
0 |
562.5 |
1.65 |
3.5 |
12.23 |
1]Salminen, R. (ed.) 2005. Geochemical Atlas of. Part 1: Background Information, Methodology and Maps.: Geological Survey of
Magnesium hydroxide is an inorganic substance, it is unlikely to cross biological membranes. Magnesium hydroxide has no bioaccumulation potential.
Additional information
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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