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Surface tension

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Reference
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:
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

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.