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
TERRESTRIAL FATE:
Magnesium is an essential nutrient for humans, animals, and plants. Magnesium is approx 2% of soil in the earth's crust, eighth in abundance, and widely distributed in the environment in a variety of rock and minerals, such as igneous (e.g., olivine), metamorphic (e.g.,montmorillonite), and sedimentary rocks (e.g., magnesite, brucite, dolimite). Rocks and minerals contain a higher percentage of magnesium than do soils resulting from the loss of magnesium due to weathering. Magnesium salts, which make up 17% of sea salt, are released to the atmosphere as sea spray.
Magnesium compounds are removed from soils by weathering. A major portion of soil magnesium consists of weathered primary minerals and secondary aluminosilicates in which Mg+2 ions are substituted for Al+3 ions. Silicates and aluminosilicates minerals undergo rapid surface exchange of H+ for Mg+2 ions followed by slow dissolution. As soils weather, H4SiO4 declines and magnesium silicates become more soluble. Increases in soil CO2 levels will increase the solubility of the magnesium silicates while decreasing the solubility of dolomite (CaMgCO3). In submerged soils where CO2 levels are high, dolimite will be the most stable mineral phase. Below pH 7.5, most magnesium minerals are too soluble to persist in soils. However in alkaline soils that have high concns of soluble H4SiO4, some magnesium silicates may actually form (e.g., talc, serpentine, sepiolite and chrysotolite)(1,2).
Based on estimated Koc value of
13.22 L/kg, indicates that magnesium
is expected to have very high
mobility in soil.
Volatilization ofmagnesium from moist soil surfaces is not expected to be an important fate process given a estimated Henry's Law constant of 1.065E-037 atm-m3/mole (1.079E-032 Pa-m3/mole) . The estimated Henrys Law Constant (25 deg C) measured by calculation from EPI SuiteTM v4.1, HENRYWIN v3.20 Program was 1.065E-037 atm-m3/mole , which is almost zero.
Volatilization of magnesium compounds from water surfaces is not an important fate process because these compounds are ionic and will not volatilize
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