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EC number: 235-310-7 | CAS number: 12163-26-7
- 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
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- 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
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- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Adsorption / desorption
Administrative data
Link to relevant study record(s)
- Endpoint:
- adsorption / desorption, other
- Remarks:
- monitoring data in water and sediment
- Type of information:
- other: Calculation of Kp values based on environmental field data
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: see 'Remark'
- Remarks:
- Kp-values are based on reliable field data of concentration levels in water and sediment; no standard guideline test was conducted to generate Kp-values. Kp-values are calculated based on the hypothesis that equilibrium exists between the baseline levels in water and in sediment.
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Evaluation of high quality environmental geochemical data for Europe, which is provided by the Forum of European Geological Surveys (FOREGS), with respect to magnesium (Mg) concentrations in stream water and stream sediment. Baseline levels of magnesium in water and sediment were determined in 745 paired sample locations. Assuming equilibrium between both environmental compartments, site-specific partitioning coefficients (Kp) were derived.
- GLP compliance:
- no
- Type of method:
- other: field data of baseline levels in water and sediment
- Media:
- sediment
- Radiolabelling:
- no
- Test temperature:
- environmental relevant temperatures
- Analytical monitoring:
- yes
- Details on sampling:
- FOREGS:
-The FOREGS sampling grid was based on GTN grid cells developed for Global Geochemical Baseline mapping. This grid divides the entire land surface into 160 km x 160 km cells covering an area of 4,500,000 km2.
- Sampling methodology, preparation and analysis are described by Salminen et al. (2005).
- A total of 808 stream water samples and 852 sediment samples were processed in the FOREGS-program, including 757 paired samples, i.e. samples with the same coordinates for the sampling location of stream water and sediment that are summarised below. However, Mg concentrations in 12 stream water samples (3 from Albania and 9 from Switzerland) were excluded from the analysis, resulting in a total of 745 paired samples summarised below.
- High quality and consistency of the obtained data were ensured by using standardised sampling methods and by treating and analysing all samples in the same laboratory of each country. - Key result
- Phase system:
- sediment-water
- Type:
- log Kp
- Value:
- 2.96 L/kg
- Remarks on result:
- other: European 50th percentile log Kp
- Adsorption and desorption constants:
- The monitoring stream water and sediment data show that Mg concentrations of sediments range from 0.1 to 25 %, while dissolved Mg concentrations in the water column of European stream waters range from 0.1 to 230 mg/L, showing a high exchange of Mg between both environmental matrices. Regarding the partitioning of magnesium in the water column, stream water/sediment partition coefficients range from 13 to 339,208 L/kg. Country-specific stream water/sediment partition coefficients are reported in Table 1 with 50th percentile log Kp values ranging from 1.12 to 5.53 L/kg. Since FOREGS sampled on a grid aiming to equally represent geochemical baseline concentrations across Europe, the 50th percentile log Kp for magnesium across Europe was determined to be 2.96 L/kg (Table 2).
- Conclusions:
- Reliable baseline levels of magnesium in pristine water/sediment samples were determined in 745 samples. Sampling and analytical procedures are considered adequate and resulted in reliable data. Assuming equilibrium between the typical concentration in water and sediment, relevant log Kp-values were generated. Data are therefore considered useful for the determination of a relevant log Kp for the sediment compartment. Since FOREGS sampled on a grid aiming to equally represent geochemical baseline concentrations across Europe, the 50th percentile concentrations of magnesium across Europe were 6,633 mg/kg sediment and 6.24 mg/L stream water, respectively, yielding a log Kp for magnesium across Europe of 2.96.
Reference
Table 1: Country-specific stream water/sediment partition coefficients (log Kp)
Country |
# of data |
Area (km2) |
Min |
Max |
Mean |
5thP |
50thP |
90thP |
95thP |
AL |
3 |
28,748 |
2.75 |
3.15 |
3.04 |
2.80 |
3.13 |
3.15 |
3.15 |
AT |
20 |
83,879 |
2.07 |
4.22 |
3.62 |
2.19 |
3.53 |
3.90 |
3.96 |
BE |
5 |
32,545 |
1.88 |
3.10 |
2.71 |
2.00 |
2.69 |
2.99 |
3.05 |
CH |
9 |
41,285 |
2.71 |
4.25 |
3.66 |
2.76 |
3.04 |
4.06 |
4.17 |
CZ |
10 |
78,866 |
2.26 |
3.66 |
3.13 |
2.44 |
2.99 |
3.44 |
3.56 |
DE |
74 |
357,121 |
1.91 |
4.23 |
3.07 |
2.25 |
2.72 |
3.38 |
3.55 |
DK |
5 |
43,098 |
1.87 |
2.15 |
2.01 |
1.88 |
2.03 |
2.11 |
2.13 |
EE |
11 |
45,227 |
1.23 |
3.41 |
2.65 |
1.34 |
2.32 |
2.85 |
3.21 |
ES |
85 |
504,645 |
1.72 |
4.16 |
3.34 |
2.30 |
2.96 |
3.72 |
3.98 |
FI |
63 |
338,144 |
2.25 |
4.45 |
3.86 |
3.20 |
3.77 |
4.13 |
4.26 |
FR |
118 |
543,965 |
1.22 |
3.98 |
3.05 |
1.68 |
2.64 |
3.47 |
3.64 |
GR |
27 |
131,957 |
2.63 |
3.78 |
3.33 |
2.76 |
3.24 |
3.64 |
3.67 |
HR |
10 |
56,542 |
2.28 |
2.96 |
2.60 |
2.30 |
2.51 |
2.84 |
2.90 |
IE |
10 |
70,273 |
1.84 |
4.31 |
3.85 |
2.56 |
3.51 |
4.24 |
4.28 |
IT |
45 |
301,336 |
1.52 |
5.00 |
3.76 |
1.87 |
2.99 |
3.94 |
4.44 |
LT |
14 |
64,589 |
2.24 |
3.13 |
2.78 |
2.32 |
2.71 |
3.01 |
3.06 |
LV |
7 |
65,301 |
2.63 |
3.02 |
2.83 |
2.68 |
2.80 |
2.94 |
2.98 |
NL |
9 |
41,526 |
1.79 |
3.05 |
2.71 |
1.91 |
2.64 |
3.01 |
3.03 |
NO |
58 |
323,759 |
2.30 |
5.53 |
4.48 |
2.88 |
4.07 |
4.79 |
4.97 |
PL |
56 |
312,685 |
1.12 |
3.13 |
2.08 |
1.34 |
1.66 |
2.43 |
2.60 |
PT |
19 |
92,345 |
1.94 |
4.28 |
3.60 |
2.43 |
3.22 |
3.97 |
4.13 |
SE |
20 |
449,964 |
3.11 |
4.08 |
3.72 |
3.11 |
3.72 |
3.94 |
3.98 |
SK |
15 |
49,034 |
2.20 |
3.53 |
3.01 |
2.22 |
2.89 |
3.37 |
3.44 |
SL |
4 |
20,253 |
3.10 |
3.47 |
3.33 |
3.14 |
3.34 |
3.45 |
3.46 |
UK |
60 |
219,331 |
1.16 |
4.76 |
3.67 |
1.91 |
3.08 |
4.01 |
4.28 |
Table 2: Concentrations of magnesium in sediment and water and resulting partition coefficients
|
Concentration |
Concentration |
Partitioning (Kp) |
Log Kp |
||||
Parameter |
Mg (sediment) |
Mg (water) |
Mg (sed / water) |
Mg (sed / water) |
||||
# |
757 |
7451 |
757 |
7451 |
757 |
7451 |
757 |
7451 |
Unit |
mg/kg |
mg/L |
L/kg |
- |
||||
Min. |
301.52 |
301.52 |
0.05 |
0.05 |
13.05 |
1.12 |
||
Max. |
14,7743.82 |
147,743.82 |
230.00 |
230.00 |
339,207.75 |
5.53 |
||
Mean |
10,508.92 |
10,456.40 |
11.69 |
11.70 |
4,829.43 |
4,847.65 |
3.00 |
2.99 |
STDEV |
15,678.36 |
15,716.86 |
19.55 |
19.65 |
17,187.37 |
17,312.88 |
0.78 |
0.79 |
5thp |
301.52 |
301.52 |
0.46 |
0.46 |
43.93 |
42.88 |
1.64 |
1.63 |
50thp |
7,236.43 |
6,633.40 |
6.25 |
6.24 |
947.18 |
912.16 |
2.98 |
2.96 |
90thp |
19,538.37 |
19,297.15 |
26.53 |
26.23 |
10,006.33 |
9,879.33 |
4.00 |
4.00 |
95thp |
29,669.37 |
28,222.08 |
38.11 |
38.63 |
17,898.84 |
18,394.78 |
4.25 |
4.26 |
1Values from Switzerland and Albania are not included.
Description of key information
Magnesium is highly mobile under all environmental conditions and occurs in solution as dissociated Mg2+ ions. A European median log Kp value of 2.96 is derived for sediment-water partitioning. Magnesium is expected to also be highly mobile in suspended matter and soil.
Key value for chemical safety assessment
Other adsorption coefficients
- Type:
- log Kp (solids-water in sediment)
- Value in L/kg:
- 2.96
Additional information
The assessment of the partitioning of Mg in freshwater sediments media is based on Kp values derived from monitoring data for elemental Mg concentrations in water and corresponding sediments provided by the FOREGS Geochemical Baseline Mapping Programme that aimed to provide high quality, multi-purpose homogeneous environmental geochemical baseline data for Europe. A total of 745 paired samples, i.e. samples with the same coordinates for the sampling location of stream water (filtered to < 0.45 µm) and sediment (wet sieved in the field to <0.15 mm) were processed (Salminen et al. 2005) and results correspond to steady-state conditions of Mg, independent of Mg speciation.
Sampled stream water and sediments cover a wide range of environmental conditions. Water parameters such as pH, hardness and organic carbon concentrations cover several magnitudes. Magnesium concentrations of sediments range from < 0.1 % to > 10% with 5thand 95thpercentile of 0.03 and 2.82 %, respectively, whereas dissolved Mg concentrations in the water column of European stream waters range from < 0.1 to > 200 mg/L with 5thand 95thpercentile 0.46 and 38.63 mg/L, respectively.
Regarding the partitioning of Magnesium in the water column, stream water/sediment partition coefficients range from 13.05 L/kg to 339,207.75 L/kg. Since FOREGS sampled on a grid aiming to equally represent geochemical baseline concentrations across Europe, a European median log Kd value of 2.96 is derived for sediment-water partitioning.
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