Registration Dossier
Registration Dossier
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EC number: 231-104-6 | CAS number: 7439-95-4
Endpoint summary
Administrative data
Description of key information
Additional information
Stability
Phototransformation in air
Phototransformation in air is not expected to be an important environmental fate process since this compound lacks functional groups that is susceptible under environmental conditions, magnesium massive as an inorganic compound cannot broken down by photons.Magnesium do not contain chromophores that absorb at wavelengths >290 nm and therefore Magnesium massive is not expected to be susceptible to direct photolysis by sunlight. Magnesium does not react with dry air but slowly gets tarnished in most air due to the formation of a thin film of the oxide.
Hydrolysis
According to “ANNEX VIII- STANDARD INFORMATION REQUIREMENTS FOR SUBSTANCES MANUFACTURED OR IMPORTED IN QUANTITIES OF 10 TONNES OR MORE , study for Hydrolysis as a function of pH does not need to be conducted if:
-the substance is ready biodegradable.
-the substance is highly insosuble in water
As magnesium is ready biodegradable (according EPI SuiteTM v4.1 and Biodegradation was predicted) a Hydrolysis study does not need to be conducted.
Magnesium as an ingot is insoluble in pure cold water. Hydrolysis is not expected to be an important environmental fate process since this compound lacks functional groups that hydrolyze under environmental conditions.
Magnesium does not decompose water in cold but decomposes boiling water or steam.
Mg + H2O ( steam) ——→ MgO + H2
Hydrolysis is a chemical reaction during which molecules of water (H2O) are split into hydrogen cations (H+, conventionally referred to as protons) and hydroxide anions (OH−) in the process of a chemical mechanism).
This substance, which is metal-containing inorganic substance, is not anticipated to hydrolyze readily in water at neutral pHs.
Phototransformation in water
Expert Judgement
If released into water, magnesium is not expected to adsorb to suspended solids and sediment based upon the estimated Koc value of 13.22 L/kg . Volatilization from water surfaces is not expected to be an important fate process based upon this compound's estimated Henry's Law constant is1.065E-037 atm-m3/mole.
Magnesium as an ingot is insoluble in pure cold water, but reacts with hot water to form Mg(OH)2 under the evolution of hydrogen gas. Reacts with seawater forming the chloride and sulphate.
On this basis phototransformation in water is not expected .
Therefore testing for Phototransformation in water does not need to be performed.
Phototransformation in soil
Expert Judgement
If released to soil, magnesium is expected to have very high mobility based upon an estimated Koc of 13.22. Volatilization from moist soil surfaces is not expected to be an important fate process based upon an estimated Henry's Law constant of1.065E-037 atm-m3/mole.
Henry's Law constant indicates that volatilization from moist soil surfaces may occur may occur slowly.
Therefore testing for Phototransformation in soils does not need to be performed.
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