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Physical & Chemical properties

Water solubility

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Description of key information

Water solubility determined as critical micelle concentration:
2.0±0.3 g/L based on the UVCB substance
1.4±0.2 g/L based on active content (sodium alkanoyl glycinate)

Key value for chemical safety assessment

Water solubility:
1.4 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 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.