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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:
09 October 2017 to 03 November 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 105 (Water Solubility)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.6 (Water Solubility)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
column elution method
Water solubility:
1.3 other: mg Sm2C3O9 /L
Conc. based on:
other: Expressed as Sm2C3O9 content in water
Temp.:
20 °C
pH:
6.5
Water solubility:
0.2 other: mg Eu2C3O9 /L
Conc. based on:
other: expressed as Eu2C3O9 content in water
Temp.:
20 °C
pH:
6.5
Water solubility:
0.6 other: mg Gd2C3O9 /L
Conc. based on:
other: expressed as Gd2C3O9 content in water
Temp.:
20 °C
pH:
6.5
Details on results:
The result for solubility in water of the element samarium was 0.8 mg samarium/L in water at pH 6.5 and 20 °C, extrapolated to 1.3 mg disamarium tricarbonate/L in water.
The result for solubility in water of the element europium was 0.2 mg europium/L in water at pH 6.5 and 20 °C, extrapolated to 0.2 mg dieuropium tricarbonate/L in water.
The result for solubility in water of the element gadolinium was 0.4 mg gadolinium/L in water at pH 6.5 and 20 °C, extrapolated to 0.6 mg digadolinium tricarbonate/L in water.

Mean Solubility of Samarium

 

Flow rate

(mL/h)

Solubility expressed as Samarium content in water

(mg/L)

Solubility of disamarium tricarbonate in water *

(mg/L)

Mean pH measured

Temperature

(°C)

Test 1

25

0.98

-

6.5

20

Test 2

25

0.79

-

6.5

20

Mean of Test 1 and Test 2

25

0.89

-

6.5

20

Test 3

12.5

0.69

-

6.5

20

Mean

12.5 and 25

0.82

1.3

6.5

20

* Extrapolation using the conversion factor e = Mw Sm2C3O9 / Mw 2Sm = 481 / 300 =1.60

 

Mean Solubility of Europium

 

Flow rate

(mL/h)

Solubility expressed as Europium content in water

(mg/L)

Solubility of disamarium tricarbonate in water *

(mg/L)

Mean pH measured

Temperature

(°C)

Test 1

25

0.18

-

6.5

20

Test 2

25

0.14

-

6.5

20

Mean of Test 1 and Test 2

25

0.16

-

6.5

20

Test 3

12.5

0.13

-

6.5

20

Mean

12.5 and 25

0.15

0.24 mg/L rounded at 0.2 mg/L

6.5

20

* Extrapolation using the conversion factor e = Mw Eu2C3O9 / Mw 2Eu= 484 / 304 =1.59

 

Mean Solubility of Gadolinium

 

Flow rate

(mL/h)

Solubility expressed as Gadoliniuum content in water

(mg/L)

Solubility of disamarium tricarbonate in water *

(mg/L)

Mean pH measured

Temperature

(°C)

Test 1

25

0.47

-

6.5

20

Test 2

25

0.38

-

6.5

20

Mean of Test 1 and Test 2

25

0.43

-

6.5

20

Test 3

12.5

0.32

-

6.5

20

Mean

12.5 and 25

0.39

0.61 mg/L rounded at 0.6 mg/L

6.5

20

* Extrapolation using the conversion factor e = Mw Gd2C3O9 / Mw 2Gd = 494 / 314 =1.57

Conclusions:
Under the conditions of the test, the mean solubility in water at pH 6.5 is as follows:
The mean solubility of samarium is 1.3 mg Sm2C3O9 /L at 20 °C (expressed as Sm2C3O9 content in water).
The mean solubility of europium is 0.2 mg Eu2C3O9 /L at 20 °C (expressed as Eu2C3O9 content in water).
The mean solubility of gadolinium is 0.6 mg Gd2C3O9 /L at 20 °C (expressed as Gd2C3O9 content in water).

Executive summary:

The water solubility of the test material was assessed according to OECD Test Guideline 105 and EU Method A.6 using the column elution method.

A preliminary test was conducted using the flask method in which the test material (100 or 10 mg) was mixed at room temperature with increasing volumes of water (0.1 to 1000 mL); mixtures were equilibrated at the test temperature and the solubility estimated for each volume by visually checking for undissolved test material. The solubility of the test material was < 0.01 g/L and therefore the main test was conducted using the column elution method.

Samples were injected into the analytical system. The intensity was measured for the analyte and the internal standard, then the intensity ratio was calculated. The concentration of analyte was plotted versus the intensity ratio obtained in the calibration solutions.

The result for solubility in water of the element samarium was 0.8 mg samarium/L in water at pH 6.5 and 20 °C, extrapolated to 1.3 mg disamarium tricarbonate/L in water.

The result for solubility in water of the element europium was 0.2 mg europium/L in water at pH 6.5 and 20 °C, extrapolated to 0.2 mg dieuropium tricarbonate/L in water.

The result for solubility in water of the element gadolinium was 0.4 mg gadolinium/L in water at pH 6.5 and 20 °C, extrapolated to 0.6 mg digadolinium tricarbonate/L in water.

Description of key information

Under the conditions of the test, the mean solubility in water at pH 6.5 is as follows:

The mean solubility of samarium is 1.3 mg Sm2C3O9 /L at 20 °C (expressed as Sm2C3O9 content in water).

The mean solubility of europium is 0.2 mg Eu2C3O9 /L at 20 °C (expressed as Eu2C3O9 content in water).

The mean solubility of gadolinium is 0.6 mg Gd2C3O9 /L at 20 °C (expressed as Gd2C3O9 content in water).

Key value for chemical safety assessment

Additional information

The water solubility of the test material was assessed according to OECD Test Guideline 105 and EU Method A.6 using the column elution method.

A preliminary test was conducted using the flask method in which the test material (100 or 10 mg) was mixed at room temperature with increasing volumes of water (0.1 to 1000 mL); mixtures were equilibrated at the test temperature and the solubility estimated for each volume by visually checking for undissolved test material. The solubility of the test material was < 0.01 g/L and therefore the main test was conducted using the column elution method.

Samples were injected into the analytical system. The intensity was measured for the analyte and the internal standard, then the intensity ratio was calculated. The concentration of analyte was plotted versus the intensity ratio obtained in the calibration solutions.

The result for solubility in water of the element samarium was 0.8 mg samarium/L in water at pH 6.5 and 20 °C, extrapolated to 1.3 mg disamarium tricarbonate/L in water.

The result for solubility in water of the element europium was 0.2 mg europium/L in water at pH 6.5 and 20 °C, extrapolated to 0.2 mg dieuropium tricarbonate/L in water.

The result for solubility in water of the element gadolinium was 0.4 mg gadolinium/L in water at pH 6.5 and 20 °C, extrapolated to 0.6 mg digadolinium tricarbonate/L in water.