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Physical & Chemical properties

Water solubility

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Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
The study was conducted between 21 August 2018 and September 2018.
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 105 (Water Solubility)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.6 (Water Solubility)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
flask method
Specific details on test material used for the study:
Identification: Reaction mass of crystalline magnesium silicate and crystalline silicon and synthetic amorphous silicon dioxide
Appearance/Physical state: black powder
Lot No: Y180510A
Purity: Mg-SiO 95 wt% Carbon 4.0 ± 2.0 %wt
Expiry date: 31 May 2019
Storage conditions: room temperature, in the dark
Key result
Water solubility:
< 0.05 mg/L
Conc. based on:
element
Remarks:
Mg
Temp.:
20 °C
pH:
6
Key result
Water solubility:
< 0.05 mg/L
Conc. based on:
element
Remarks:
Si
Temp.:
20 °C
pH:
6
Key result
Water solubility:
< 3 mg/L
Conc. based on:
element
Remarks:
C
Temp.:
20 °C
pH:
6

Preliminary Test

The preliminary result for the water solubility at 20.0 ± 0.5 °C is shown in the following table. The solution had a pH of 6.3.

Elemental Analysis

Concentration

(mg/L)

Mg

<0.05

Si

<0.05

C

<1

Definitive Test

The mean peak counts per second relating to the standard and sample solutions are shown in the following table:

Solution

Mean Peak Counts per Second

Magnesium

Silicon

Scandium

Matrix blank

153097.06

81091.37

1108446.26

Standard 0.05 mg/L

2374758.61

111980.09

1090978.60

Standard 0.10 mg/L

5536540.06

165214.53

1093139.06

Standard 0.25 mg/L

8363776.13

233409.31

1098634.20

Standard 0.50 mg/L

10451568.73

382868.77

1102567.68

Standard 1.0 mg/L

21887278.00

720207.07

1102032.04

Standard 1.5 mg/L

29025454.57

1005744.16

1069033.12

Standard 2.0 mg/L

39293985.25

1288314.21

1092672.14

Matrix blank

1896038.44

61307.37

1080084.10

Sample 1A

903179.21

74038.79

1071268.79

Sample 1B

475057.31

74623.69

1067687.79

Sample 2A

593510.36

74155.73

1051497.28

Sample 2B

575537.14

75583.80

1059421.36

Sample 3A

1685362.84

75536.74

1055291.22

Sample 3B

785984.35

78428.36

1059281.14

The carbon concentrations relating to the sample solutions are shown in the following table:

Solution

Concentration (mg/L)

Total Carbon

Inorganic Carbon

Organic Carbon

Matrix blank A

0.646

0.245

0.401

Matrix blank B

0.892

0.189

0.703

Sample 1A

0.614

0.237

0.378

Sample 1B

0.551

0.237

0.313

Sample 2A

2.94

0.260

2.68

Sample 2B

3.10

0.295

2.81

Sample 3A

2.97

0.245

2.73

Sample 3B

2.94

0.256

2.68

The concentration (g/L) of test item in the sample solutions is shown in the following table:

 

Sample number

Time Shaken

at 30 °C

(hours)

Concentration (mg/L)

Solution pH

Magnesium

Silicon

Carbon

1

24

<0.05

<0.05

<1

6.0

2

48

<0.05

<0.05

2.75

6.0

3

72

<0.05

<0.05

2.71

6.0

Overall magnesium concentration : <0.05 mg/L at 20.0 ± 0.5 °C

Overall silicon concentration : <0.05 mg/L at 20.0 ± 0.5 °C

Overall carbon concentration : <3 mg/L at 20.0 ± 0.5 °C

Conclusions:
The water solubility of the test item at 20.0 ± 0.5 °C has been determined based on elemental analysis and the results are as follows:
Elemental Analysis Concentration (mg/L)
Mg <0.05
Si <0.05
C <3
Executive summary:

Water Solubility. Determined at 20.0 ± 0.05 °C by elemental analysis, using the flask method, designed to be compatible with Method A.6 Water Solubility of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 105 of the OECD Guidelines for Testing of Chemicals, 27 July 1995, and the results are as follows:

Elemental Analysis

Concentration (mg/L)

Mg

<0.05

Si

<0.05

C

<3

Description of key information

Water Solubility. Determined at 20.0 ± 0.05 °C by elemental analysis, using the flask method, designed to be compatible with Method A.6 Water Solubility of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 105 of the OECD Guidelines for Testing of Chemicals, 27 July 1995, and the results are as follows:

Elemental Analysis

Concentration (mg/L)

Mg

<0.05

Si

<0.05

C

<3

Key value for chemical safety assessment

Water solubility:
0.05 mg/L
at the temperature of:
20 °C

Additional information