Registration Dossier
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EC number: 266-840-7 | CAS number: 67656-24-0
Surface tension
Administrative data
Link to relevant study record(s)
- Endpoint:
- surface tension
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 115 (Surface Tension of Aqueous Solutions)
- GLP compliance:
- not specified
- Type of method:
- ring method
- Key result
- Surface tension:
- 69.15 mN/m
- Temp.:
- 20 °C
- Conc.:
- 1 g/L
Reference
For each measurement, the mean value was determined from the measuring points. The mean value of the three measurements was then calculated. Each measurement point was automatically corrected using LabVIEW's Harkins-Jordan method.
The following surface tension values were determined:
Solution |
Concentration [g/L] |
Surface tension |
L1 |
1 |
69.15 |
L2 |
10 |
61.52 |
L3 |
100 |
45.11 |
L4 |
521.4 |
33.89 |
A regression equation (concentration vs. surface tension) was obtained, showing a convergence towards zero.
Function: y = 73.654 * x -0.115
Coefficient of determination (R²): 0.9485
As the concentration corresponding to 90% of the saturation solubility is higher than 1 g/L, the resulting surface tension for the solution with concentration 1 g/L was used as the final result, according to OECD Method 115.
No micelles formed during the test, the determination of the critical micelle concentration (CMC) was therefore omitted.
Description of key information
Surface tension: 69.15 mN/m for a 1 g/L solution at 20 °C (OECD Guideline 115, ring method)
Key value for chemical safety assessment
- Surface tension:
- 69.15
- in mN/m at 20°C and concentration in mg/L:
- 1 000
Additional information
As the concentration corresponding to 90% of the saturation solubility is higher than 1 g/L, the resulting surface tension for the solution with concentration 1 g/L was used as the final result, according to OECD Method 115.
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