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Water solubility

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Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017-10-19 to 2018-04-09
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:
yes
Remarks:
Two vessels were set up in a parallel design, each vessel was sampled several times instead of sampling one single vessel at each point in time; mean temperature: 21.8 ± 0.4 °C
Qualifier:
according to guideline
Guideline:
EU Method A.6 (Water Solubility)
Version / remarks:
2008
Deviations:
yes
Remarks:
Two vessels were set up in a parallel design, each vessel was sampled several times instead of sampling one single vessel at each point in time; mean temperature: 21.8 ± 0.4 °C
GLP compliance:
yes (incl. QA statement)
Remarks:
signed 2016-05-31
Type of method:
flask method
Specific details on test material used for the study:
Storage: Store tightly sealed in original container at well-ventilated premises. Do not leave container open. Avoid residues on the container.
Hazardous fluoride containing pyrolysis products might be formed upon intensive heating.
Water solubility:
19.1 g/L
Conc. based on:
element (dissolved fraction)
Remarks:
Cs and Al
Loading of aqueous phase:
91.5 g/L
Incubation duration:
>= 6 - <= 8 d
Temp.:
21.8 °C
pH:
>= 7.75 - <= 7.87
Details on results:
- The mean temperature was 21.8 ± 0.4 °C.
- pH value of solutions containing the test item: 7.75 - 7.87
- pH value in method blanks: 5.54 - 5.74
- The turbidity in samples was always <1 NTU indicating that centrifuged and filtered solutions did not contain any undissolved material.
- Aluminium concentrations in method blank samples of all sampling days: 25.7 ± 32.1 µg/L (6d), 23.1 ± 28.2 µg/L (7d), 23.5 ± 28.8 µg/L (8d)
- Cesium concentrations in method blank samples of all sampling days: 115 ± 145 µg/L (6d), 146 ± 186 µg/L (7d), 149 ± 190 µg/L (8d)
Due to the low background concentration of aluminium and cesium in method blanks in contrast to the aluminium and cesium concentration in test samples a subtraction of the mean method blank is considered as not necessary and is not performed.

The cesium and aluminium measurements were performed by ICP-OES and ICP-MS. In the following tables the results are summarised.

The calculated variations / changes between the sampling points were less than 15 % for the days 7 and 8. Thus, the validity criteria as foreseen in OECD 105 [4] and Regulation 440/2008/EC A.6 were fulfilled.

Mean aluminium concentrations of vessel 1 and 2 over all sampling periods.

Sampling [d]

sample

LOD [µg/L]

LOQ [µg/L]

Al conc. Per vessel ± SD [g/L]

mean Al conc. all vessels± SD [g/L]

Variation / change between samplings [%]

6

Vessel 1

0.305

0.916

0.934 ± 0.002

0.930 ± 0.006

-

Vessel 2

0.305

0.916

0.925 ± 0.008

7

Vessel 1

0.305

0.916

0.925 ± <0.001

0.937 ± 0.017

0.82

Vessel 2

0.305

0.916

0.950 ± 0.001

8

Vessel 1

0.305

0.916

0.896 ± 0.003

0.908 ± 0.018

3.10

Vessel 2

0.305

0.916

0.921 ± 0.009

 

Mean cesium concentrations of vessel 1 and 2 over all sampling periods.

Sampling [d]

sample

LOD [µg/L]

LOQ [µg/L]

Cs conc. Per vessel ± SD [g/L]

mean SCs conc. all vessels± SD [g/L]

Variation / change between samplings [%]

6

Vessel 1

0.004

0.012

12.3 ± 0.06

12.2 ± 0.11

-

Vessel 2

0.004

0.012

12.2 ± 0.01

7

Vessel 1

0.004

0.012

12.3 ± 0.20

12.3 ± 0.07

0.41

Vessel 2

0.004

0.012

12.2 ± 0.06

8

Vessel 1

0.004

0.012

12.2 ± 0.12

12.3 ± 0.13

0.20

Vessel 2

0.004

0.012

12.4 ± 0.14

The amount of dissolved Cesium tetrafluoroaluminate was calculated by:

 Considering aluminium and cesium:

Amount of aluminium in test item = 10.2 %

Amount of cesium in test item = 57.7 %

Amount of aluminium and cesium = 67.7 %

Purity of the test item = 98.2 %

 

Mean concentration of aluminium and cesium added:

           Vessel 1:        13.2 ± 0.08 g/L

           Vessel 1:        13.2 ± 0.12 g/L

 

With this concentrations the dissolved test item was calculated:

 Mean of concentration x 98.2 % / 67.7 %:

           Vessel 1:       19.1 ± 0.12 g/L

           Vessel 2:       19.1 ± 0.17 g/L

           Mean:            19.1 ± 0.14 g/L

Calculation of water solubility according to aluminium and cesium (addition of aluminium and cesium concentration).

Sample

Al + Cs conc. [g/L] 

SD

[g/L]

Al + Cs in test item

[%]

Calculated amount of test item dissolved on basis of

Al + Cs (98.2% Purity)

[g/L]

SD

[g/L]

mean both vessels

[g/L]

SD

[g/L]

Mean vessel 1

(day 6, 7 and 8)

13.2

0.08

 67.9

19.1

0.12

19.1

0.14

Mean vessel 2

(day 6, 7 and 8)

13.2

0.12

 67.9

19.1

0.17

Conclusions:
Based on dissolved Cs and Al the solubilty of cesium fluoroaluminate was determined. The test substance has a water solubility of 19.1 ± 0.14 g/L at ca. 22 °C.

Description of key information

Cesium fluoroaluminate has a water solubility of 19.1 ± 0.14 g/L at ca. 22 °C.

Key value for chemical safety assessment

Water solubility:
19.1 g/L
at the temperature of:
22 °C

Additional information