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Physical & Chemical properties

Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline study performed under GLP. All relevant validity criteria were met; minor deviation not affecting the reliability of the study
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
yes
Remarks:
A ring with a reduced circumference of 4 cm was used - no effect on the integrity of the study
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
yes
Remarks:
A ring with a reduced circumference of 4 cm was used - no effect on the integrity of the study
GLP compliance:
yes (incl. certificate)
Remarks:
inspected: June 2015; signature: September 2015
Type of method:
ring method
Surface tension:
53.1 mN/m
Temp.:
20 °C
Conc.:
90 other: wt%
Remarks on result:
other: Mean surface tension (n=2); range - 53.0 - 53.2 mN/m; temperature: 20.0 ± 0.5 °C

Surface tension = reading x calibration factor

Sample A mean calibration factor = 0.997

Sample B mean calibration factor = 0.996

Sample A surface tension = 53.2 mN/m

Sample B surface tension = 53.0 mN/m

Mean surface tension : 53.1 mN/m

Temperature : 20.0 ± 0.5 ºC

pH of sample solution : Sample A = 6.5 ; Sample B = 6.3

Conclusions:
The surface tension of a 90% saturated solution of test item in water has been determined to be 53.1 mN/m at 20.0 ± 0.5 °C. The test item is considered to be a surface-active substance.
Executive summary:

The surface tension was determined according to EU Method A.5 and OECD TG 115 using the ring method under GLP. The test system considered of a torsion balance for surface and interfacial tension measurements. The measuring body consisted of a 4 cm circumference platinum (Du Nouy) ring. In order to calculate the surface tension, the mean test item sample solution reading was calculated from those values obtained from the apparatus considered to be on a consistent data plateau. This value was then multiplied by the mean calibration factor (Φb), established from the bracketing surface tension values obtained from the apparatus for the purified water common to tensiometer calibration and the sample solution preparations. The surface tension result was not corrected using the Harkins-Jordan correction table as the correction is not applicable to the apparatus used. Once calibrated, the balance and ring assembly used in this test give a direct reading for surface tension that is within the required accuracy (± 0.5 mN/m); this is as a result of the reduced ring dimensions. This deviation has been considered not to have affected the integrity of the study. 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 90% saturated solution of test item in water has been determined to be 53.1 mN/m at 20.0 ± 0.5 °C. The test item is considered to be a surface-active substance.

Description of key information

Surface Tension: 53.1 mN/m at 20.0 ± 0.5 °C, EU Method A.5, 2016

Key value for chemical safety assessment

Additional information

Key study: EU Method A.5, 2016 : The surface tension was determined according to EU Method A.5 and OECD TG 115 using the ring method under GLP. The test system considered of a torsion balance for surface and interfacial tension measurements. The measuring body consisted of a 4 cm circumference platinum (Du Nouy) ring. Once calibrated, the balance and ring assembly used in this test give a direct reading for surface tension that is within the required accuracy (± 0.5 mN/m). 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 90% saturated solution of test item in water has been determined to be 53.1 mN/m at 20.0 ± 0.5 °C. The test item is considered to be a surface-active substance.