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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:
Mar. 2018 - Jul. 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
dated 27. July 1995
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
from 30. May 2008, published on 31 May 2008
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
plate method
Remarks:
Tensiometer
Surface tension:
72.76 mN/m
Temp.:
19.8 °C
Conc.:
1 g/L

Measurement Values Test Item First Series

 Measurement [No]

 Time [s]  Mass [g]  Surface Tension [mN/m]  Temperature [°C]
 1  4.2  0.2991  72.96  19.8
 2  5.1  0.2982  72.74  19.8
 3  6.1  0.2982  72.74  19.8
 4  7.1  0.2982  72.74  19.8
 5  8.1  0.2979  72.67  19.8
 6  9.1  0.2982  72.74  19.8
 7  10.1  0.2982  72.74  19.8
 8  11.1  0.2985  72.82  19.8
 9  12.1  0.2981  72.72  19.8
 10  13.1  0.2980  72.70  19.8
 Mean      72.76  
 Standard Deviation      0.08  

60 minutes after conclusion of the first measurement series, a second measurement series was performed for verification purposes.

Measured Values Test Item Second Series

 Measurement [No]  Time [s]  Mass [g]  Surface Tension [mN/m]  Temperature [°C]
 1  4.2  0.2987  72.87  20.1
 2  5.1  0.2982  72.74   20.1
 6.2  0.2977  72.62   20.1
 4  7.1  0.2980  72.70   20.1
 5  8.2 0.2982   72.74   20.1
 6  9.1 0.2979   72.67   20.1
 7  10.2  0.2979  72.67   20.1
 8  11.1  0.2979  72.67   20.1
 9  12.2  0.2980  72.70   20.1
 10  13.1  0.2979  72.67   20.1
 Mean      72.71   
 Standard Deviation      0.07   

After the first and the second measurement series, the difference between mean values was less than 5%. Therefore no additional measurement series was required.

Conclusions:
The surface tension of the test sample was determined as 72.76 ± 0.08 mN/m at 19.8 °C.
Executive summary:

The surface tension of the test sample was determined as 72.76 ± 0.08 mN/m at 19.8 °C according to OECD guideline 115 and EU Method A.5. One measurement was performed for verification (after 60 minutes). No significant changes and thus no significant dependence on time was observed.

As these values were higher than 60 mN/m, the test sample was classified as not surface active.

The surface tension of the negative control lay within the accepted range.

Description of key information

The surface tension of the test sample was determined as 72.76 ± 0.08 mN/m at 19.8 °C according to OECD guideline 115 and EU Method A.5. One measurement was performed for verification (after 60 minutes). No significant changes and thus no significant dependence on time was observed.

As these values were higher than 60 mN/m, the test sample was classified as not surface active.

The surface tension of the negative control lay within the accepted range.

Key value for chemical safety assessment

Surface tension:
72.76
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information