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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:
03 September 2014 to 16 November 2014
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:
1995
Deviations:
yes
Remarks:
A platinum ring with a reduced circumference of 4 cm was used (guidelines specify 6 cm). The balance and ring give a reading within the required accuracy (± 0.5 mN/m). The reduced ring dimensions are not considered to affect the integrity of the test.
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
2008
Deviations:
yes
Remarks:
A platinum ring with a reduced circumference of 4 cm was used (guidelines specify 6 cm). The balance and ring give a reading within the required accuracy (± 0.5 mN/m). The reduced ring dimensions are not considered to affect the integrity of the test.
GLP compliance:
yes (incl. certificate)
Type of method:
ring method
Key result
Surface tension:
>= 59.8 - <= 67.5 mN/m
Temp.:
20 °C
Conc.:
1 g/L

Mean Sample 1 result: 59.8 mN/m, pH of Sample 1: 11.6

Mean Sample 2 result: 67.5 mN/m, pH of Sample 2: 11.6

Mean Sample 3 result: 65.1 mN/m, pH of Sample 3: 11.7

Overall result: In the range 59.8 to 67.5 mN/m

Overall temperature: 20.0 ± 0.5 °C

Conclusions:
Under the conditions of this study the surface tension of three test material solutions prepared at a nominal concentration of 1.0 g/L in water has been determined to be in the range 59.8 to 67.5 mN/m at 20.0 ± 0.5 °C. The test material was therefore considered not to be surface-active.
Executive summary:

The surface tension of the test material was investigated in accordance with the standardised guidelines OECD 115 and EU Method A5, under GLP conditions.

A platinum ring with a reduced circumference of 4 cm was used, whereas the guidelines specify 6 cm. 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). The reduced ring dimensions are not considered to affect the integrity of the test.

Due to the high variance of the results, the surface tension of the test material has been given as a range instead of an average of the results of the three samples tested. The cause of this variability probably lies in the composition of the test material, which is not pure and has several minor components/impurities with different affinities for water. The samples were filtered before taking the surface tension readings, in an attempt to eliminate the precipitate formed at the nominal sample concentration required by the method guidelines.

The reduction in the surface tension of water, by dissolving a substance, indicates whether the test material is surface-active or not. According to criteria mentioned in Method A5, test materials showing a surface tension lower than 60 mN/m under the conditions of this method should be regarded as being surface active.

Under the conditions of this study the surface tension of three test material solutions prepared at a nominal concentration of 1.0 g/L in water has been determined to be in the range 59.8 to 67.5 mN/m at 20.0 ± 0.5 °C. The test material was therefore considered not to be surface-active.

Description of key information

Under the conditions of this study the surface tension of three test material solutions prepared at a nominal concentration of 1.0 g/L in water has been determined to be in the range 59.8 to 67.5 mN/m at 20.0 ± 0.5 °C. The test material was therefore considered not to be surface-active.

Key value for chemical safety assessment

Surface tension:
63.7
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

The surface tension of the test material was investigated in accordance with the standardised guidelines OECD 115 and EU Method A5, under GLP conditions. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

A platinum ring with a reduced circumference of 4 cm was used, whereas the guidelines specify 6 cm. 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). The reduced ring dimensions are not considered to affect the integrity of the test.

Due to the high variance of the results, the surface tension of the test material has been given as a range instead of an average of the results of the three samples tested. The cause of this variability probably lies in the composition of the test material, which is not pure and has several minor components/impurities with different affinities for water. The samples were filtered before taking the surface tension readings, in an attempt to eliminate the precipitate formed at the nominal sample concentration required by the method guidelines.

The reduction in the surface tension of water, by dissolving a substance, indicates whether the test material is surface-active or not. According to criteria mentioned in Method A5, test materials showing a surface tension lower than 60 mN/m under the conditions of this method should be regarded as being surface active.

Under the conditions of this study the surface tension of three test material solutions prepared at a nominal concentration of 1.0 g/L in water has been determined to be in the range 59.8 to 67.5 mN/m at 20.0 ± 0.5 °C. The test material was therefore considered not to be surface-active.