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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
20 OKT 2005 - 06 MAR 2006
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
Directive 67/548/EEC Annex V
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
1995
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
ring method
Surface tension:
68.9 mN/m
Temp.:
20 °C
Conc.:
2.5 mg/L

An aqueous solution of the test item in de-ionized water with a concentration of 2.5 mg/L (90 % of the water solubility: 2.8 mg/L, determination of the water solubility of project 20011518.02) was prepared. The solution was treated for 1 hour in an ultrasonic bath (20 - 30 °C) and stirred for 17 hours at 25 °C ± 5 °C. After tempering for 2 hours at 20 ± 0.5 °C, the measurement of the surface tension with the test item was carried out at 20 ± 0.5 °C. Six measurements every 5 minutes were performed.

Measurement  1

Time / min

10  15  20  25 
σ/ mN/m 68.9   69.0  69.1 69.0  69.0   69.1

Mean value:  σ = 69.017 mN/m

The mean value, multiplied by the calibration factor (F=1.0013) yields to:

σF = σ x F = 69.109 mN/m

After correction with respect to the table given in the consolidated version of Council Directive 67/548/EEC Annex V method A.5. (Harkins-Jordan correction), the final value for the surface tension at 20 °C is:

σ = 68.9 mN/m

Due to the fact that the surface tension is higher than 60 mN/m, the test item is not to be considered as surface-active.

Conclusions:
The surface tension of the aqueous solution at 20 °C is 68.9 mN/m.
Executive summary:

The surface tension of the sample was tested according to EU Method A.5 and OECD Guideline 115 in a GLP study with the ring method.

The surface tension of the aqueous solution at 20 °C is 68.9 mN/m.

Due to the fact that the surface tension is higher than 60 mN/m, the test item is not to be considered as surface-active.

Description of key information

The surface tension of the sample was tested according to EU Method A.5 and OECD Guideline 115 in a GLP study with the ring method.

The surface tension of the aqueous solution at 20 °C is 68.9 mN/m.

Due to the fact that the surface tension is higher than 60 mN/m, the test item is not to be considered as surface-active.

Key value for chemical safety assessment

Surface tension:
68.9
in mN/m at 20°C and concentration in mg/L:
2.5

Additional information