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EC number: 231-104-6 | CAS number: 7439-95-4
- 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
Additional information
Environmental fate and pathways
Environmental Fate/Exposure Summary:
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.
The production and use of magnesium compounds as refractories (e.g., olivine), as chemical intermediates, and in construction materials(e.g,magnesium oxide) may result in their release to the environment through various waste streams while the production and use of magnesium compounds in environmental applications (e.g., magnesium hydroxide), agriculture (e.g., magnesium sulfate), and ice control (e.g., magnesiumchloride) result in their direct release to the environment. Magnesium compounds, as ionic salts, will exist solely in the particulate phase in the ambient atmosphere. Particulate-phase magnesium compounds may be removed from the air by wet and dry deposition. Magnesium compounds in soil are removed by weathering. As soils weather, soil magnesium compounds become more soluble. Below pH 7.5, most magnesium minerals are too soluble to persist in soils.
Volatilization of magnesium compounds from moist soil surfaces is not an important fate process because these compounds are ionic and will not volatilize. Natural water systems acquire magnesium through weathering reactions, which involve the interaction of water and atmosphere with the earth's crust and subsequent leaching of magnesium compounds into water.
If released into water,magnesium compounds may be removed by incorporation into sediment. For example, a small amount of magnesium is ion exchanged for calcium on clay minerals in ocean sediment. Also small amounts of magnesium carbonate are deposited with calcite in seawater. There is also significant uptake of magnesium by sediment in which sulfate reduction is taking place. The avg Kd value for magnesium sorption on sediments is 1.3 cu m/kg, which suggests that magnesium ions are weakly sorbed.
Volatilization of magnesium compounds from water surfaces is not an important fate process because these compounds are ionic and will not volatilize. Magnesium is widespread in living cells and does not bioconcentrate in aquatic organisms. Occupational exposure to magnesium compounds may occur through inhalation and dermal contact with these compounds at workplaces where magnesium compounds are produced or used. Monitoring data indicate that the general population is exposed to magnesium compounds via inhalation of ambient air, ingestion of food and drinking water, and dermal contact with compounds and consumer products containing magnesium compounds. The average daily intake of magnesium for a 25-30 yr man is 288 mg/day. (SRC)
TERRESTRIAL
FATE:
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).
(1)
Aikawa JK; pp. 1025-1034 in Metals and Their Compounds in the
Environment. Merian E, ed. Weinheim, Germany: VCH (1991)
(2) Bodek I et al (eds); Environmental Inorganic Chemistry. Elmsford, NY: Pergamon Press pp. 6.5-1 to 6.5-10 (1988)]
Based
on estimated Koc value of13.22 L/kg, indicates that magnesium
is expected to have very high mobility in soil.
Volatilization of magnesium 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
The estimated Biodegradetion show that magnesiumis expected to degrade rapidly in both aerobic and anaerobic conditions.
The estimated Biodegradetion was measured by calculation from EPI SuiteTM v4.1Program and no Biodegradation was predicted . This is Exposure Assessment Tools and Models made from EPA (Environmental Protection Agency) .
Ready Biodegradability Prediction: YES
These rates suggest that biodegradation may be an important environmental fate process in soil
AQUATIC
FATE:
Natural water systems acquire magnesium through weathering reactions, which involve the interaction of water and atmosphere with the earth's crust and subsequent leaching of magnesium compounds into water. The Mg2+ ion is the predominant form of dissolved magnesium. However, some magnesium complexes do form.
The magnesium sulfate ion pair complex (MgSO4) is the most significant complex present, representing 2.6% and 11% of the total magnesium content in fresh and sea water, respectively. The concentrations of bicarbonate and carbonate complexes are significant but considerably less than sulfate complexes. Incorporation of magnesium compounds into sediment is an important removal process. For example, a small amount of magnesium is ion exchanged for calcium on clay minerals in ocean sediment. Also small amounts of magnesium carbonate (about 6% of the magnesium supplied by rivers) are deposited with calcite (CaCO3) in seawater. There is significant uptake of magnesium (about 24% of the river input of magnesium) by sediment in which sulfate reduction is taking place(1). The avg Kd value for magnesium sorption on Po River sediments is 1.3 cu m/kg, which suggests that magnesium ions are weakly sorbed on sediments(2). High-temperature alteration of basalts at hydrothermal vents apparently constitute the most important sink for magnesium in seawater(1).
(1)
Bodek I et al, eds; Environmental Inorganic Chemistry. Elmsford, NY:
Pergamon Press pp. 6.5-1 to 6.5-10 (1988)
2) Pettine M et al; Sci Tot Environ 145: 243-265 (1994)
Based on on estimated Koc value of
13.22 L/kg, indicates that magnesium
is not expected to adsorb to suspended solids and
sediment.
Volatilization from water surfaces is not expected based upon a Henry's Law constant of 1.065E-037 atm-m3/mole (1.079E-032 Pa-m3/mole).
According to, an estimated BCF of3.162L/kg wet-wt , from Log Kow estimated:-0.57and regression-derived equations, suggest the potential for bioconcentration in aquatic organisms is low.
Magnesium is
widespread in living cells(1) and does not bioconcentrate in
aquatic organisms.
(1)
Aikawa JK; pp. 1025-1034 in Metals and Their Compounds in the
Environment. Merian E, ed. Weinheim, Germany: VCH (1991)]
The estimated Biodegradetion show that magnesium is expected to degrade rapidly in both aerobic and anaerobic conditions.
The estimated Biodegradetion was measured by calculation from EPI SuiteTM v4.1Program and no Biodegradation was predicted . This is Exposure Assessment Tools and Models made from EPA (Environmental Protection Agency) .
Ready Biodegradability Prediction: YES
These rates suggest that biodegradation may be an important environmental fate process.
ATMOSPHERIC
FATE:
As ionic salts, magnesium compounds will exist solely in the particulate phase in the ambient atmosphere. Particulate-phase magnesium compounds may be removed from the air by wet and dry deposition.
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.
Biodegradation
Biodegradation in water: screening tests
The estimated Biodegradetion was measured by calculation from EPI SuiteTM v4.1 Program and Biodegradation was predicted . This is Exposure Assessment Tools and Models made from EPA (Environmental Protection Agency) .
Biowin1 (Linear Model Prediction) : Biodegrades Fast
Biowin2 (Non-Linear Model Prediction): Biodegrades Fast
Biowin3 (Ultimate Biodegradation Timeframe): Weeks
Biowin4 (Primary Biodegradation Timeframe): Days
Biowin5 (MITI Linear Model Prediction) : Biodegrades Fast
Biowin6 (MITI Non-Linear Model Prediction): Biodegrades Fast
Biowin7 (Anaerobic Model Prediction): Biodegrades Fast
Ready Biodegradability Prediction: YES
SMILES : [Mg]
EC Name: MAGNESIUM
CAS Name: MAGNESIUM
Molecular Formula: Mg
MOL WT : 24.3039
------+-----+--------------------------------------------+---------+---------
TYPE | NUM | Biowin1 FRAGMENT DESCRIPTION | COEFF | VALUE
------+-----+--------------------------------------------+---------+---------
MolWt| * | Molecular Weight Parameter | | -0.0125
Const| * | Equation Constant | | 0.7475
============+============================================+=========+=========
RESULT | Biowin1 (Linear Biodeg Probability) | | 0.7350
============+============================================+=========+=========
------+-----+--------------------------------------------+---------+---------
TYPE | NUM | Biowin2 FRAGMENT DESCRIPTION | COEFF | VALUE
------+-----+--------------------------------------------+---------+---------
MolWt| * | Molecular Weight Parameter | | -0.3738
============+============================================+=========+=========
RESULT | Biowin2 (Non-Linear Biodeg Probability) | | 0.9331
============+============================================+=========+=========
A Probability Greater Than or Equal to 0.5 indicates --> Biodegrades Fast
A Probability Less Than 0.5 indicates --> Does NOT Biodegrade Fast
------+-----+--------------------------------------------+---------+---------
TYPE | NUM | Biowin3 FRAGMENT DESCRIPTION | COEFF | VALUE
------+-----+--------------------------------------------+---------+---------
MolWt| * | Molecular Weight Parameter | | -0.0582
Const| * | Equation Constant | | 3.1992
============+============================================+=========+=========
RESULT | Biowin3 (Survey Model - Ultimate Biodeg) | | 3.1410
============+============================================+=========+=========
------+-----+--------------------------------------------+---------+---------
TYPE | NUM | Biowin4 FRAGMENT DESCRIPTION | COEFF | VALUE
------+-----+--------------------------------------------+---------+---------
MolWt| * | Molecular Weight Parameter | | -0.0380
Const| * | Equation Constant | | 3.8477
============+============================================+=========+=========
RESULT | Biowin4 (Survey Model - Primary Biodeg) | | 3.8098
============+============================================+=========+=========
Result Classification: 5.00 -> hours 4.00 -> days 3.00 -> weeks
(Primary & Ultimate) 2.00 -> months 1.00 -> longer
------+-----+--------------------------------------------+---------+---------
TYPE | NUM | Biowin5 FRAGMENT DESCRIPTION | COEFF | VALUE
------+-----+--------------------------------------------+---------+---------
MolWt| * | Molecular Weight Parameter | | -0.0783
Const| * | Equation Constant | | 0.7121
============+============================================+=========+=========
RESULT | Biowin5 (MITI Linear Biodeg Probability) | | 0.6338
============+============================================+=========+=========
------+-----+--------------------------------------------+---------+---------
TYPE | NUM | Biowin6 FRAGMENT DESCRIPTION | COEFF | VALUE
------+-----+--------------------------------------------+---------+---------
MolWt| * | Molecular Weight Parameter | | -0.7599
============+============================================+=========+=========
RESULT |Biowin6 (MITI Non-Linear Biodeg Probability)| | 0.8539
============+============================================+=========+=========
A Probability Greater Than or Equal to 0.5 indicates --> Readily Degradable
A Probability Less Than 0.5 indicates --> NOT Readily Degradable
------+-----+--------------------------------------------+---------+---------
TYPE | NUM | Biowin7 FRAGMENT DESCRIPTION | COEFF | VALUE
------+-----+--------------------------------------------+---------+---------
Const| * | Equation Constant | | 0.8361
============+============================================+=========+=========
RESULT | Biowin7 (Anaerobic Linear Biodeg Prob) | | 0.8361
============+============================================+=========+=========
A Probability Greater Than or Equal to 0.5 indicates --> Biodegrades Fast
A Probability Less Than 0.5 indicates --> Does NOT Biodegrade Fast
Ready Biodegradability Prediction: (YES or NO)
----------------------------------------------
Criteria for the YES or NO prediction: If the Biowin3 (ultimate survey
model) result is "weeks" or faster (i.e. "days", "days to weeks", or
"weeks" AND the Biowin5 (MITI linear model) probability is >= 0.5, then
the prediction is YES (readily biodegradable). If this condition is not
satisfied, the prediction is NO (not readily biodegradable). This method
is based on application of Bayesian analysis to ready biodegradation data
(see Help). Biowin5 and 6 also predict ready biodegradability, but for
degradation in the OECD301C test only; using data from the Chemicals
Evaluation and Research Institute Japan (CERIJ) database.
Biodegradation in water and sediment: simulation tests
According to “ANNEX IX- STANDARD INFORMATION REQUIREMENTS FOR SUBSTANCES MANUFACTURED OR IMPORTED IN QUANTITIES OF 100 TONNES OR MORE”, a ready biodegradability study does not need to be performed if the substance is ready biodegradable. As magnesium is ready biodegradable a ready biodegradability study does not need to be conducted.
The estimated Biodegradetion was measured by calculation from EPI SuiteTM v4.1Program and Biodegradation was predicted . This is Exposure Assessment Tools and Models made from EPA (Environmental Protection Agency) .
Biodegradation in soil
According to “ANNEX IX- STANDARD INFORMATION REQUIREMENTS FOR SUBSTANCES MANUFACTURED OR IMPORTED IN QUANTITIES OF 100 TONNES OR MORE”, a ready biodegradability study does not need to be performed if the substance is ready biodegradable. As magnesium is ready biodegradable a ready biodegradability study does not need to be conducted.
The estimated Biodegradetion was measured by calculation from EPI SuiteTM v4.0 Program and Biodegradation was predicted . This is Exposure Assessment Tools and Models made from EPA (Environmental Protection Agency) .
Bioaccumulation
This substance has a limited potential to bioaccumulate (based on log Kow used :, Log Kow estimated : -0.57, and predicted bioconcentration factors, log BCF =0.500 (EPIWIN/BCF Program).
The estimated BCF of3.162L/kg wet-wt was measured by calculation from EPI SuiteTM v4.1 Program.
These values would suggest very low bioaccumulation potential.
This is Exposure Assessment Tools and Models made from EPA (Environmental Protection Agency).
BCFBAF Program (v3.01) Results:
==============================
SMILES : [Mg]
EC Name: MAGNESIUM
CAS Name: MAGNESIUM
Molecular Formula: Mg
MOL WT : 24.3039
--------------------------------- BCFBAF v3.01 --------------------------------
Summary Results:
Log BCF (regression-based estimate): 0.50 (BCF = 3.16 L/kg wet-wt)
Biotransformation Half-Life (days) : 0.0166 (normalized to 10 g fish)
Log BAF (Arnot-Gobas upper trophic): -0.04 (BAF = 0.904 L/kg wet-wt)
Log Kow (experimental): not available from database
Log Kow used by BCF estimates: -0.57
Equation Used to Make BCF estimate:
Log BCF = 0.50
Correction(s): Value
Correction Factors Not Used for Log Kow < 1
Estimated Log BCF = 0.500 (BCF = 3.162 L/kg wet-wt)
Magnesium is
widespread in living cells(1) and does not bioconcentrate in
aquatic organisms.
Bioaccumulation: aquatic / sediment
This substance has a limited potential to bioaccumulate (based on log Kow used :, Log Kow estimated : -0.57 , and predicted bioconcentration factors, log BCF = 0.500 (EPIWIN/BCF Program).
The estimated BCF of 3.162 L/kg wet-wt was measured by calculation from EPI SuiteTM v4.1 Program.
These values would suggest very low bioaccumulation potential.
This is Exposure Assessment Tools and Models made from EPA (Environmental Protection Agency).
BCFBAF Program (v3.01) Results:
==============================
SMILES : [Mg]
EC Name: MAGNESIUM
CAS Name: MAGNESIUM
Molecular Formula: Mg
MOL WT : 24.3039
--------------------------------- BCFBAF v3.01 --------------------------------
Summary Results:
Log BCF (regression-based estimate): 0.50 (BCF = 3.16 L/kg wet-wt)
Biotransformation Half-Life (days) : 0.0166 (normalized to 10 g fish)
Log BAF (Arnot-Gobas upper trophic): -0.04 (BAF = 0.904 L/kg wet-wt)
Log Kow (experimental): not available from database
Log Kow used by BCF estimates: -0.57
Equation Used to Make BCF estimate:
Log BCF = 0.50
Correction(s): Value
Correction Factors Not Used for Log Kow < 1
Estimated Log BCF = 0.500 (BCF = 3.162 L/kg wet-wt)
Bioaccumulation: terrestrial
This substance has a limited potential to bioaccumulate (based on log Kow used :, Log Kow estimated : -0.57, and predicted bioconcentration factors, log BCF =0.500 (EPIWIN/BCF Program).
The estimated BCF of3.162 L/kg wet-wt was measured by calculation from EPI SuiteTM v4.1 Program.
These values would suggest very low bioaccumulation potential.
This is Exposure Assessment Tools and Models made from EPA (Environmental Protection Agency).
BCFBAF Program (v3.01) Results:
==============================
SMILES : [Mg]
EC Name: MAGNESIUM
CAS Name: MAGNESIUM
Molecular Formula: Mg
MOL WT : 24.3039
--------------------------------- BCFBAF v3.01 --------------------------------
Summary Results:
Log BCF (regression-based estimate): 0.50 (BCF = 3.16 L/kg wet-wt)
Biotransformation Half-Life (days) : 0.0166 (normalized to 10 g fish)
Log BAF (Arnot-Gobas upper trophic): -0.04 (BAF = 0.904 L/kg wet-wt)
Log Kow (experimental): not available from database
Log Kow used by BCF estimates: -0.57
Equation Used to Make BCF estimate:
Log BCF = 0.50
Correction(s): Value
Correction Factors Not Used for Log Kow < 1
Estimated Log BCF = 0.500 (BCF = 3.162 L/kg wet-wt)
===========================================================
Whole Body Primary Biotransformation Rate Estimate for Fish:
===========================================================
------+-----+--------------------------------------------+---------+---------
TYPE | NUM | LOG BIOTRANSFORMATION FRAGMENT DESCRIPTION | COEFF | VALUE
------+-----+--------------------------------------------+---------+---------
L Kow| * | Log Kow = -0.57 (KowWin estimate) | 0.3073 | -0.1755
MolWt| * | Molecular Weight Parameter | | -0.0675
Const| * | Equation Constant | | -1.5058
============+============================================+=========+=========
RESULT | LOG Bio Half-Life (days) | | -1.7801
RESULT | Bio Half-Life (days) | | 0.01659
NOTE | Bio Half-Life Normalized to 10 g fish at 15 deg C |
============+============================================+=========+=========
Biotransformation Rate Constant:
kM (Rate Constant): 41.77 /day (10 gram fish)
kM (Rate Constant): 23.49 /day (100 gram fish)
kM (Rate Constant): 13.21 /day (1 kg fish)
kM (Rate Constant): 7.428 /day (10 kg fish)
Arnot-Gobas BCF & BAF Methods (including biotransformation rate estimates):
Estimated Log BCF (upper trophic) = -0.044 (BCF = 0.9044 L/kg wet-wt)
Estimated Log BAF (upper trophic) = -0.044 (BAF = 0.9044 L/kg wet-wt)
Estimated Log BCF (mid trophic) = -0.026 (BCF = 0.9423 L/kg wet-wt)
Estimated Log BAF (mid trophic) = -0.026 (BAF = 0.9423 L/kg wet-wt)
Estimated Log BCF (lower trophic) = -0.022 (BCF = 0.9505 L/kg wet-wt)
Estimated Log BAF (lower trophic) = -0.022 (BAF = 0.9505 L/kg wet-wt)
Arnot-Gobas BCF & BAF Methods (assuming a biotransformation rate of zero):
Estimated Log BCF (upper trophic) = -0.035 (BCF = 0.9217 L/kg wet-wt)
Estimated Log BAF (upper trophic) = -0.035 (BAF = 0.9221 L/kg wet-wt)
Transport and distribution
Adsorption / desorption
According to “ANNEX IX- STANDARD INFORMATION REQUIREMENTS FOR SUBSTANCES MANUFACTURED OR IMPORTED IN QUANTITIES OF 100 TONNES OR MORE , an adsorption study need not be conducted if:
— based on the physicochemical properties the substance can be expected to have a low potential for adsorption (e.g. the substance has a low octanol water partition coefficient), or
— the substance and its degradation products decompose rapidly.
Octanol/Water Partition Coefficient ofmagnesiumis low (log Kow =-0.57)
If released into water,magnesiumis not expected to adsorb to suspended solids and sediment based upon the Koc. The Koc ofmagnesiumcan be estimated to be13.22.This estimated Koc value suggests thatMagnesiumis expected to have very high mobility in soil.
The estimated Soil Adsorption Coefficient was13.22L/kg measured by calculation from EPI SuiteTM v4.1 Program. This is Exposure Assessment Tools and Models made from EPA (Environmental Protection Agency
These results suggest thatmagnesiumhas high soil mobility and does not have a high potential for adsorption to soil
KOCWIN Program (v2.00) Results:
SMILES : [Mg]
EC Name: MAGNESIUM
CAS Name: MAGNESIUM
Molecular Formula: Mg
MOL WT : 24.3039
--------------------------- KOCWIN v2.00 Results ---------------------------
Koc Estimate from MCI:
---------------------
First Order Molecular Connectivity Index ........... : 1.000
Non-Corrected Log Koc (0.5213 MCI + 0.60) .......... : 1.1211
Fragment Correction(s) --> NONE : ---
Corrected Log Koc .................................. : 1.1211
Estimated Koc: 13.22 L/kg <===========
Koc Estimate from Log Kow:
-------------------------
Log Kow (Kowwin estimate) ......................... : -0.57
Non-Corrected Log Koc (0.8679 logKow - 0.0004) ..... : -0.4951
Fragment Correction(s) --> NONE : ---
Corrected Log Koc .................................. : -0.4951
Estimated Koc: 0.3198 L/kg <===========
Henry's Law constant.
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 (1.079E-032 Pa-m3/mole) , which is almost zero.
This is Exposure Assessment Tools and Models made from EPA (Environmental Protection Agency).
Distribution modelling.
The concentrations in water and sediment are effectively independent of the compartment into which the emissions occur. Concentrations in air and soil depend on what compartment emissions occured to and are quite variable. Only emissions to air contribute to atmospheric concentrations whilst deposition in soil comes approximately 50/50 from direct emissions to soil and indirectly from emissions to air.
Mackay fugacity modelling (level 3) indicates that, taking into account degradation and using inflow parameters which are consistent with the known production tonnage of this substance in, fugacity coefficient indicates that environmental concentrations in water are predicted to be 1.41e-006 (atm), in air (atm) 2.6e-032 and soil 3.36e-006 (atm) and sediment to be 1.28e-006 (atm).
These are negligible low levels. This can be considered a worse case prediction as it assumes all product is emitted with no emission control systems used.
Other distribution data
These results suggest for magnesium that direct and indirect exposure from distribution in media is unlikely.
Based on low vapor pressure and low estimated log Pow, expected to
partition to water. Not expected to partition to air, sediments or biota.
Therefore testing for distribution in media does not need to be performed.
The estimated STP Fugacity Model and Volatilization From Water were measured by calculation from EPI SuiteTM v4.1 Program. This is Exposure Assessment Tools and Models made from EPA (Environmental Protection Agency) .
Volatilization From Water
=========================
Chemical Name: MAGNESIUM
Molecular Weight : 26.32 g/mole
Henry's Law Constant: 0.0245 atm-m3/mole (estimated by Bond SAR Method)
RIVER LAKE
--------- ---------
Water Depth (meters): 1 1
Wind Velocity (m/sec): 5 0.5
Current Velocity (m/sec): 1 0.05
HALF-LIFE (min ) : 32.15 2932
HALF-LIFE (hours) : 0.5358 48.86
HALF-LIFE (days ) : 0.02232 2.036
STP Fugacity Model: Predicted Fate in a Wastewater Treatment Facility
======================================================================
(using 10000 hr Bio P,A,S)
PROPERTIES OF: MAGNESIUM
-------------
Molecular weight (g/mol) 26.32
Aqueous solubility (mg/l) 0
Vapour pressure (Pa) 0
(atm) 0
(mm Hg) 0
Henry 's law constant (Atm-m3/mol) 0.0245
Air-water partition coefficient 1.00198
Octanol-water partition coefficient (Kow) 0.269153
Log Kow -0.57
Biomass to water partition coefficient 0.853831
Temperature [deg C] 25
Biodeg rate constants (h^-1),half life in biomass (h) and in 2000 mg/L MLSS (h):
-Primary tank 0.04 17.05 10000.00
-Aeration tank 0.04 17.05 10000.00
-Settling tank 0.04 17.05 10000.00
STP Overall Chemical Mass Balance:
---------------------------------
g/h mol/h percent
Influent 1.00E+001 3.8E-001 100.00
Primary sludge 2.47E-002 9.4E-004 0.25
Waste sludge 1.46E-002 5.5E-004 0.15
Primary volatilization 1.30E-001 4.9E-003 1.30
Settling volatilization 3.48E-002 1.3E-003 0.35
Aeration off gas 8.84E+000 3.4E-001 88.44
Primary biodegradation 1.74E-003 6.6E-005 0.02
Settling biodegradation 5.09E-005 1.9E-006 0.00
Aeration biodegradation 6.84E-004 2.6E-005 0.01
Final water effluent 9.49E-001 3.6E-002 9.49
Total removal 9.05E+000 3.4E-001 90.51
Total biodegradation 2.47E-003 9.4E-005 0.02
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