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EC number: 237-742-1 | CAS number: 13963-58-1
Water solubility
Administrative data
- Endpoint:
- water solubility
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2017-03-02 to 2017-03-13
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 017
- Report date:
- 2017
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 105 (Water Solubility)
- Version / remarks:
- 1995
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.6 (Water Solubility)
- Version / remarks:
- 2008
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- signed 2017-02-28
- Type of method:
- flask method
Test material
- Reference substance name:
- Tripotassium hexacyanocobaltate
- EC Number:
- 237-742-1
- EC Name:
- Tripotassium hexacyanocobaltate
- Cas Number:
- 13963-58-1
- Molecular formula:
- C6CoN6.3K
- IUPAC Name:
- tripotassium hexacyanocobaltate
- Test material form:
- solid: particulate/powder
- Details on test material:
- - Name of test material: Potassium hexacyanocobaltate (III)
- Physical state: solid, slightly yellowish powder
Constituent 1
Results and discussion
Water solubility
- Water solubility:
- 324.4 g/L
- Conc. based on:
- test mat.
- Loading of aqueous phase:
- 1 200 g/L
- Incubation duration:
- >= 48 - <= 96 h
- Temp.:
- 20 °C
- pH:
- >= 10.9 - <= 11.4
Any other information on results incl. tables
Preliminary Test
The preliminary test at room temperature showed, that the water solubility of the test item was between 116.6 g/L and 233.2 g/L. Therefore, the flask method was performed.
Amount of test item [mg] |
Total volume of added water [mL] |
Stirring time [min] |
Remark |
| 116.6 | 0.1 |
-- | not dissolved |
| 0.5 | -- | not dissolved | |
| 1.0 | -- | dissolved |
Main Test (flask method)
For the main test three flasks were prepared with an amount of test item and water, and one flask only with water. After stirring and centrifugation the aqueous phases were measured by means of HPLC. The solution of each flask has been measured twice. The values represented in the table are rounded values. The calculation was carried out with the original not rounded values.
Results of the flask method
| Flask | 1a |
2a |
3a |
4a |
measured value [g/L] |
0.153 / 0.154 |
0.178 / 0.176 |
0.156 /0.157 |
0/0 |
aliquot of the flask [mL] |
0.5 |
0.5 |
0.5 |
0.5 |
total volume after 1st dilution [mL] |
50 |
50 |
50 |
50 |
aliquot of the 1st dilution [mL] |
0.05 |
0.05 |
0.05 |
0.05 |
total volume after 2nd dilution [mL] |
1 |
1 |
1 |
1 |
water solubility [g/L] |
305.6 / 307.3 |
356.2 / 351.5 |
312.6 / 313.0 |
0 / 0 |
average water solubility [g/L] |
306.5 |
353.8 |
312.8 |
0 |
mean value of the water solubility [g/L] |
324.4 |
0 |
||
standard deviation [g/L] |
25.7 |
-- |
||
relative standard deviation [%] |
7.9 |
-- |
||
To verify the accuracy of the analytical method a fresh prepared standard solution (prepared with the test item) was measured in between the samples of the flask method.
Measurement of a standard solution
Standard solution (nominal value [mg/L]) |
Measured value [mg/L] | Repeatability [%] |
147.4 |
142.417 |
96.6 |
145.763 |
98.9 |
|
190.8 |
187.762 |
98.4 |
190.477 |
99.8 |
The recovery rate of the measured standard solutions was in the range from 96.6 % to 99.8 %, which shows a good accuracy of the analytical method.
Applicant's summary and conclusion
- Conclusions:
- According to OECD Test Guideline 105 (1995) and Regulation (EC) No. 440/2008 Method A.6. the water solubility at 20 °C of the test item potassium hexacyanocobaltate (III) was determined to be:
cS = 324.4 g/L
RSD = 7.9 %
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