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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:
2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline study performed under GLP
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Remarks:
inspected March 2013; signature: May 2013
Type of method:
ring method
Surface tension:
44.4 mN/m
Temp.:
20 °C
Conc.:
90 vol%
Remarks on result:
other: mean determined surface tension, multiplied by Φb (calibration factor) and with Harkins-Jordan correction - considered to be false positive due to surface active impurities with high water solubility

Surface tension of the test substance

Measurement

Time passed

[minutes]

Surface tension [mN/m]

individual

mean #1

mean multiplied by Φb and Harkins-Jordan corrected value

1

2

3

4

5

6

15

17

18

19

20

21

45.8

45.3

45.7

45.6

45.5

45.4

45.5

44.4

 #1 Mean calculated from measurements 2 to 6; after equilbrium was reached

Conclusions:
The surface tension of a test solution at 90% saturation in water has been determined to be 44.4 mN/m at 20.0 ± 0.5 °C. However, this result is considered to be the result of surface active impurities leading to false-positive surface tension measurement (based on the observation of a corresponding critical micelle concentration determination that observed that the test substance is not surface active up to the concentration slightly above the water solubility). The test substance is considered not to be surface-active.
Executive summary:

The surface tension was determined using the ring method of EU Method A.5 and OECD 115. Substances showing a surface tension lower than 60 mN/m under the conditions of this method, should be regarded as being surface active. The surface tension of a test solution at 90% of the test substance saturation solubility in water has been determined to be 44.4 mN/m at 20.0 ± 0.5 °C. According to this, the test substance should be considered to be a surface-active. Based on the results obtained during the determination of the critical micelle concentration determination; it was observed that the test substance is not surface active up to concentrations slightly above water solubility. Therefore, the test substance is considered to be not surface active and the results of the 90% saturated solution from a nominal concentration of 1 g/L is considered to be a false positive caused by surface active impurities in the test substance with a high water solubility.

Description of key information

Surface Tension: False positive due to impurities with high water solubility: 44.4 mN/m at 20.0 ± 0.5 °C in 90% saturated solution, EU Method A.5, 2014

Key value for chemical safety assessment

Additional information

Key study: EU Method A.5, 2014 : The surface tension was determined using the ring method of EU Method A.5 and OECD 115. Substances showing a surface tension lower than 60 mN/m under the conditions of this method, should be regarded as being surface active. The surface tension of a test solution at 90% of the test substance saturation solubility in water has been determined to be 44.4 mN/m at 20.0 ± 0.5 °C. According to this, the test substance should be considered to be a surface-active. Based on the results obtained during the determination of the critical micelle concentration determination; it was observed that the test substance is not surface active up to concentrations slightly above water solubility. Therefore, the test substance is considered to be not surface active and the results of the 90% saturated solution from a nominal concentration of 1 g/L is considered to be a false positive caused by surface active impurities in the test substance with a high water solubility.