Registration Dossier
Registration Dossier
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The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
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EC number: - | 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:
- 2014
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Well reported study in which the test parameters documented are based on a specific national testing guideline ISO 4311.
- Qualifier:
- according to guideline
- Guideline:
- other: ISO 4311
- GLP compliance:
- no
- Type of method:
- other: Determination of critical micelle concentration
- Key result
- Water solubility:
- 0.075 g/L
- Conc. based on:
- test mat.
- Temp.:
- 20 °C
- pH:
- 8.13
- Details on results:
- The surface tension vs. concentration plot shows a minimum. In accordance with ISO 4311, the cmc is taken as the minimum. The standard error in the cmc is estimated from the uncertainty of the slope of the low concentration branch of the plot.
The critical micelle concentration obtained is thus 0.0075±0.005 g/L - Conclusions:
- Water solubility determined as critical micelle concentration: 0.0075±0.005 g/L
Interpretation of results: slightly soluble (0.1-100 mg/L) - Executive summary:
The critical micelle concentration of the test item was determined from a plot of surface tension versus concentration of the test item in water in a well reported study according to national testing guideline DIN ISO 4311. The critical micelle concentration is the appropriate parameter describing water solubility of surface active materials.
Reference
Description of key information
0.0075 g/L at 20°C and pH 8.13 (water solubility determined as critical micelle concentration)
Key value for chemical safety assessment
- Water solubility:
- 0.007 g/L
- at the temperature of:
- 20 °C
Additional information
The critical micelle concentration of the test item was determined from a plot of surface tension versus concentration of the test item in water in a well reported study according to national testing guideline DIN ISO 4311.
Surfactants show a complex solubility behaviour due to aggregation. The monomer concentration, and hence the thermodynamic activity, reaches a limiting value at the critical micelle concentration (cmc). It remains approximately constant as the total concentration is further increased. For ecotoxicological models requiring a solubility value, the critical micelle concentration is therefore the appropriate parameter describing the water solubility of surface active materials.
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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