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
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 of magnesium can be estimated to be13.22.This estimated Koc value suggests that Magnesium is 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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