Cesium fluoroaluminate

Water solubility

Link to relevant study record(s)

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