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Diss Factsheets

Physical & Chemical properties

Water solubility

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Jun. 4, 2019 - Jan. 31, 2020, experimental phase: Jun. 11 - Aug. 7, 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
Version / remarks:
1995
Deviations:
no
Remarks:
All filtrated test solutions showed a slightly Tyndall effect (i.e. a laser beam was slightly scattered when transmitted through the liquid). This was considered as uncritical as the concentration of undissolved particles was quantified via Tyndall device
Qualifier:
according to guideline
Guideline:
EU Method A.6 (Water Solubility)
Version / remarks:
2014
GLP compliance:
yes (incl. QA statement)
Remarks:
Landesamt für Umwelt, Wasserwirtschaft und Gewerbeaufsicht Rheinland-Pfalz
Type of method:
flask method
Specific details on test material used for the study:
Name: Silicic acid, magnesium aluminium sodium salt
Batch no.: 201810LC007
Appearance: white fluffy powder
Composition: Sodium; Magnesium; Aluminium; Silica
CAS No.: 12040-43-6
EC-No.: 234-919-5
Purity: >95%
Homogeneity: homogeneous
Specific surface area: 57.9 m²/g
Key result
Water solubility:
ca. 902 mg/L
Loading of aqueous phase:
50 g/L
Incubation duration:
ca. 24 - ca. 144 h
Temp.:
20.5 °C
pH:
ca. 10 - ca. 10.17

The concentrations of Silicon (Si), Magnesium (Mg), Aluminium (Al) and Sodium (Na) at

20.0 ± 0.5 °C in the nominal load 50 g/L were stated in the following table:

Table 3.2-a Summary Si, Mg, Na and Al

Element

 Concentration [mg/L]

Standard Deviation [mg/L]

Relative Standard

Deviation [%]

 Concentration [kg/m³]

 Si

 188.9

4.9 

 2.6

 0.189

Mg

 11.64

0.48

 4.1

 0.01164

 Na

 130.5

5.18

 4.0

 0.131

 Al

 0.361

 0.069

 19.3

 0.000361

Assuming that the dissolution products expressed as Si(OH)4, Mg(OH)2, NaOH and Al(OH)3, which is very reasonable, the total dissolution rate can be calculated to approx. 902 mg/L not considering the standard derivation for the nominal concentration 50 g/L.

Conclusions:
Assuming that the dissolution products expressed as Si(OH)4, Mg(OH)2, NaOH and Al(OH)3, which is very reasonable, the total dissolution rate can be calculated to approx. 902 mg/L
Executive summary:

The solubility of Silicic acid, magnesium aluminium sodium salt in water was determined by measurement of Silicon (Si), Magnesium (Mg), Aluminium (Al) and Sodium (Na) per ICP-OES in filtrated test solutions with the nominal concentration 50 g/L

Description of key information

The solubility of Silicic acid, magnesium aluminium sodium salt in water was determined by measurement of Silicon (Si), Magnesium (Mg), Aluminium (Al) and Sodium (Na) per ICP-OES in filtrated test solutions with the nominal concentration 50 g/L.

Assuming that the dissolution products expressed as Si(OH)4, Mg(OH)2, NaOH and Al(OH)3, which is very reasonable, the total dissolution rate can be calculated to approx. 902 mg/L

Key value for chemical safety assessment

Water solubility:
902 mg/L
at the temperature of:
20.5 °C

Additional information