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Physical & Chemical properties

Water solubility

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Reference
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:
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.

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.