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Water solubility

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Description of key information

Water solubility determined as critical micelle concentration: 0.011±0.002 g/L

Key value for chemical safety assessment

Water solubility:
0.011 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 and OECD 115 (adapted).

Surfactants show a complex solubility behaviour due to aggregation. The monomer concentration, and hence the thermodynamic activity, reaches a limiting value at the crirical micelle concentration. 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 water solubility of surface active materials.