Registration Dossier
Registration Dossier
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EC number: 947-359-8 | CAS number: -
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
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study
- Remarks:
- Analytical verification of concentration is not done
- Qualifier:
- according to guideline
- Guideline:
- other: OECD 115
- Deviations:
- no
- Principles of method if other than guideline:
- Concentration (CMC) is used to specify the water solubility. The CMC has been determined with the tensiometer KRUSS KT 100, which consists in the measurement of the surface tension with of a platinic plate, whereby the surfactant solution is continuously diluted by means of bi-distillated water. As long as the surfactant molecules do not yet aggregate to micelles the concentration of non-aggregated surfactant molecules increases and the surface tension decreases. At concentration higher than the CMC the concentration of micelles increases, meanwhile the concentration of non-aggregated surfactant molecules and the surface tension remain more or less constant. Two regression lines are drawn through the points representing the surface tension as a function of the concentration: The first through descending part and the second one through the more or less constant part of the curve. The intersection of both regression lines defines the CMC.
- GLP compliance:
- not specified
- Type of method:
- other: Tensiometer Kruss Standard plate method
- Key result
- Water solubility:
- 10.469 mg/L
- Conc. based on:
- test mat.
- Temp.:
- 25 °C
- Remarks on result:
- other: Critical micelle concentration
- Conclusions:
- Under the study conditions, the the CMC or water solubility of the test substance was determined to be 10.469 mg/L at 25°C.
- Executive summary:
A study was conducted to determined the water solubility of the test substance, based on critical micelle concentration (CMC), similar to the OECD Guideline 115 and EU Method A.5. Due to the surface activity of the test substance, the CMC value was considered as a water soluibility equivalent in accordance with the ECHA R.7a Guidance. Under study conditions, the CMC of the test substance was determined to be 10.469 mg/L at 25˚C (Dobbelstein, 2017).
Reference
Results: The intercept of the regression lines at stable surface tension and the line representing the lineal decrease of Surface tension is considered to represent the Critical Micelle Concentration (CMC).
The Critical Micelle Concentration is therefore estimated as 10.469 mg/L.
| Concentration (mg/L) | avg Surface tesnion (mN/m) |
| 1000 | `-- |
| 1000 | 22.94 |
| 870.958 | `-- |
| 870.958 | 22.89 |
| 758.582 | `-- |
| 758.582 | 22.93 |
| 660.69 | `-- |
| 660.69 | 23.16 |
| 575.43 | `-- |
| 575.43 | 23.44 |
| 501.19 | `-- |
| 501.19 | 23.65 |
| 436.51 | `-- |
| 436.51 | 24.02 |
| 380.187 | `-- |
| 380.187 | 24.47 |
| 331.131 | `-- |
| 331.131 | 24.98 |
| 288.4 | `-- |
| 288.4 | 25.22 |
| 251.187 | `-- |
| 251.187 | 25.74 |
| 218.778 | `-- |
| 218.778 | 25.69 |
| 190.54 | `-- |
| 190.54 | 25.88 |
| 165.95 | `-- |
| 165.95 | 25.88 |
| 144.542 | `-- |
| 144.542 | 25.81 |
| 125.89 | `-- |
| 125.89 | 25.68 |
| 109.64 | `-- |
| 109.64 | 25.54 |
| 95.4985 | `-- |
| 95.4985 | 25.43 |
| 83.17 | `-- |
| 83.17 | 24.44 |
| 72.44 | `-- |
| 72.44 | 25.07 |
| 63.095 | `-- |
| 63.095 | 24.43 |
| 54.95 | `-- |
| 54.95 | 24.2 |
| 47.863 | `-- |
| 47.863 | 23.68 |
| 41.6899 | `-- |
| 41.6899 | 23.21 |
| 36.3 | `-- |
| 36.3 | 23.21 |
| 31.622 | `-- |
| 31.622 | 22.97 |
| 27.542 | `-- |
| 27.542 | 22.65 |
| 23.988 | `-- |
| 23.988 | 23.09 |
| 20.892 | `-- |
| 20.892 | 22.8 |
| 18.196 | `-- |
| 18.196 | 22.8 |
| 15.849 | `-- |
| 15.849 | 22.94 |
| 13.8 | `-- |
| 13.8 | 23.31 |
| 12.022 | `-- |
| 12.022 | 24.38 |
| 10.471 | `-- |
| 10.471 | 23.26 |
| 9.12 | `-- |
| 9.12 | 25.35 |
| 7.94 | `-- |
| 7.94 | 24.83 |
| 6.918 | `-- |
| 6.918 | 25.83 |
| 6.0256 | `-- |
| 6.0256 | 24.44 |
| 5.24 | `-- |
| 5.24 | 26.36 |
| 4.5708 | `-- |
| 4.5708 | 27.49 |
| 3.981 | `-- |
| 3.981 | 27.18 |
| 3.46 | `-- |
| 3.46 | 26.58 |
| 3.01 | `-- |
| 3.01 | 30.37 |
| 2.6308 | `-- |
| 2.6308 | 29.87 |
| 2.29 | `-- |
| 2.29 | 30.51 |
| 1.99 | `-- |
| 1.99 | 31.08 |
| 1.73 | `-- |
| 1.73 | 31.03 |
| 1.5136 | `-- |
| 1.5136 | 31.21 |
| 1.31 | `-- |
| 1.31 | 32.34 |
| 1.1481 | `-- |
| 1.1481 | 32.81 |
| 1 | `-- |
| 1 | 33.27 |
Description of key information
The water solubility of the test substance was determined based on critical micelle concentration (a water solubility equivalent of surfactant), similar to OECD Guideline 115 and EU Method A.5 (Dobbelstein, 2017).
Key value for chemical safety assessment
- Water solubility:
- 10.469 mg/L
- at the temperature of:
- 25 °C
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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