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EC number: 209-506-8 | CAS number: 583-52-8
Water solubility
Administrative data
Link to relevant study record(s)
- Endpoint:
- water solubility
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 02 Nov - 14 Dec 2015
- 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)
- Version / remarks:
- adopted in 2014
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- flask method
- Water solubility:
- 392 g/L
- Conc. based on:
- element (dissolved fraction)
- Temp.:
- 20 °C
- pH:
- 8.3
Reference
Results
Table 1 – Preliminary test results
Test item amount [mg] |
Added vol. of distilled water [mL] |
Total volume [mL] |
Appearance of mixture |
122.6 |
0.1 |
0.1 |
Not dissolved |
0.4 |
0.5 |
Dissolved |
Water solubility was found to be > 245 g/L. Therefore, the flask method was used to determine water solubility of the test item.
A further stirring test was performed before the main test, to determine the highest test item concentration that can be sufficiently stirred in a mixture with water.
Table 2 – Stirring test results
Test item amount [mg] |
Total vol. of distilled water [mL] |
Appearance of mixture |
5.32 |
1 |
Could not be stirred |
2 |
Could be stirred |
|
10.52 |
4 |
Could be stirred |
After the equilibration time, precipitate was seen in the flaks with the exception of the blank experiment. Water solubility of the test item was calculated from the measured concentration of potassium based on a mass fraction of potassium (42.44 mol%) of the test item. Water solubility was calculated from measured unrounded concentration values and not from rounded values.
Table 3 – Test item water solubility
Experiment |
24 h experiment |
48 h experiment |
72 h experiment |
Blank experiment (72 h) |
Test item amount [g] |
26.42 |
26.39 |
26.45 |
-- |
Distilled water amount [mL] |
10
|
|
||
Stirring time at 30 °C [h] |
24 |
48 |
72 |
72 |
pH at 23 °C |
8.3 |
|
||
Measured concentration potassium [g/L] |
170 |
160 |
170 |
0.003 |
Water solubility [g/L] |
400 |
377 |
400 |
0.007 |
The mean water solubility of the test item at 20 °C was determined to be cs= 392 g/L
Description of key information
392 g/L at 20 °C and pH 8.3 (OECD 105, flask method)
Key value for chemical safety assessment
- Water solubility:
- 392 g/L
- at the temperature of:
- 20 °C
Additional information
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