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EC number: 240-369-7 | CAS number: 16260-27-8
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:
- 2017-11-27 to 2017-12-19
- 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:
- Exclusion of CO2 and O2, two vessels was set up in a parallel design at 20 ± 1 °C, each vessel was sampled several times instead of sampling one vessel at every time point.
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.6 (Water Solubility)
- Version / remarks:
- 2008
- Deviations:
- yes
- Remarks:
- Exclusion of atmospheric CO2 and O2, two vessels was set up in a parallel design at 20 ± 1 °C, each vessel was sampled several times instead of sampling one vessel at every time point.
- GLP compliance:
- yes
- Type of method:
- flask method
- Specific details on test material used for the study:
- Conditions of storage: Store at a dry place at room temperature (10°C – 30°C), in original container
Handling: Please handle the substance as far as possible under inert gas. - Water solubility:
- 1.14 mg/L
- Conc. based on:
- test mat.
- Loading of aqueous phase:
- 102 mg/L
- Incubation duration:
- <= 11 d
- Temp.:
- 20 °C
- pH:
- >= 5.9 - <= 6.2
- Conclusions:
- Under the conditions of this test (under exclusion of CO2 and O2, under inert gas; flask method; loadings of 104 mg and 100 mg test substance/L), a solubility equilibrium was reached during the first eight days of testing. The mean measured amount of dissolved zinc on day 8, 10 and 11 at 20 ± 1 °C is 0.14 mg/L (determined as dissolved zinc, separated by filtration from undissolved test item minus content zinc in blanks). This corresponds to a water solubility of dissolved zinc ditetradecanoate of 1.14 mg/L, calculated on a zinc content of 12.3 %. Solution pH in samples containing the test item remained at 5.9 – 6.2 while the pH in method blanks ranged from 5.9 – 6.0.
Reference
Preliminary test
The preliminary test showed a water solubility of "Zinc ditetradecanoate" lower than the expected limit of quantification of approximately 0.1 mg/L at 20 °C after measuring the content of zinc in the filtered solutions outside GLP.
Therefore the sponsor decided to carry out the main test with a loading rate of approximately 100 mg test item / L.
Main test
The temperature of the water bath was 20 ± 1°C. The pH of the test solutions and blanks were in the range between 5.9 and 6.2.
Measured dissolved zinc concentrations of solutions containing the test item do not continuously increase during the test but vary from 0.15 to 0.18 mg zinc / L (sampling at day 8, 10 and 11). Measured dissolved zinc concentrations of control solutions (i.e. background concentrations) vary from 0.02 to 0.03 mg zinc / L.
Based on the zinc content of zinc ditetradecanoate of 12.3 %, water solubility is estimated with 1.14 mg zinc ditetradecanoate / L (mean value – blank).
Measured concentrations of zinc in the solutions
| Equilibration time (Days) | Measured concentration in µg zinc / L | ||||
| Blank | 1st |
2nd |
Mean (1st & 2nd) |
Mean (1st & 2nd) – blank corrected |
|
8 |
0.02 |
0.15 |
0.16 |
0.16 |
0.14 |
10 |
0.03 |
0.16 |
0.17 |
0.16 |
0.13 |
11 |
0.02 |
0.16 |
0.18 |
0.17 |
0.15 |
Mean |
0.02 |
0.16 |
0.17 |
0.16 |
0.14 |
Standard deviation |
0.00 |
0.01 |
0.01 |
0.01 |
0.01 |
Relative standard deviation (%) |
3.3 |
3.8 |
4.9 |
4.3 |
7.14 |
Description of key information
Zinc ditetradecanoate has a water solubility of 1.14 mg/L at 20 °C.
Key value for chemical safety assessment
- Water solubility:
- 1.14 mg/L
- at the temperature of:
- 20 °C
Additional information
Under the conditions of this test (under exclusion of CO2 and O2, under inert gas; flask method; loadings of 104 mg and 100 mg test substance/L), a solubility equilibrium was reached during the first eight days of testing. The mean measured amount of dissolved zinc on day 8, 10 and 11 at 20 ± 1 °C is 0.14 mg/L (determined as dissolved zinc, separated by filtration from undissolved test item minus content zinc in blanks). This corresponds to a water solubility of dissolved zinc ditetradecanoate of 1.14 mg/L, calculated on a zinc content of 12.3 %. Solution pH in samples containing the test item remained at 5.9 – 6.2 while the pH in method blanks ranged from 5.9 – 6.0.
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