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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:
02.04. - 03-04.2007
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
1992
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
1995
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
OECD harmonised ring method
Key result
Surface tension:
50 mN/m
Temp.:
20 °C
Conc.:
1 g/L

Table 1: Surface tension

































Measurement



1



2



3



4



5



6



Time / sec



24



86



147



209



270



332



σ 1 mN/m



50.04



50.00



49.95



49.94



49.91



49.91



 


 


Mean value: σ = 49.96 mN/m (corrected by Zuidema and Waters)


Due to the fact that the surface tension is lower than 60 mN/m, the test item has surface-active properties.

Conclusions:
The surface tension of the aqueous solution at 20 °C is lower than 60 mN/m (50 mN/m). The test item has surface-active properties.
Executive summary:

A study was conducted according to OECD TG 115 and the consolidated version of Council Directive 67/548/EEC Annex V (Council Directive 92/69/EEC) Method A.5. to determine the surface tension of an aqueous solution of the test item using the ring method. An aqueous solution of the test item in de-ionized water with a concentration of approximately 1.0 g/L was prepared and stirred at ambient temperature for about 28 h. After adapting to 20 °C the measurement of the surface tension with the test item was carried out at 20 °C ± 0.5 °C. Six measurements every minute were performed. The aqueous solution of the test item had a mean surface tension of 50 mN/m. As the surface tension is lower than 60 mN/m, the test item has surface-active properties.

Description of key information

The surface tension of the aqueous solution at 20 °C is lower than 60 mN/m (50 mN/m). The test item has surface-active properties (reference 4.10-1).

Key value for chemical safety assessment

Surface tension:
50
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

A study was conducted according to OECD TG 115 and the consolidated version of Council Directive 67/548/EEC Annex V (Council Directive 92/69/EEC) Method A.5. to determine the surface tension of an aqueous solution of the test item using the ring method. An aqueous solution of the test item in de-ionized water with a concentration of approximately 1.0 g/L was prepared and stirred at ambient temperature for about 28 h. After adapting to 20 °C the measurement of the surface tension with the test item was carried out at 20 °C ± 0.5 °C. Six measurements every minute were performed. The aqueous solution of the test item had a mean surface tension of 50 mN/m. As the surface tension is lower than 60 mN/m, the test item has surface-active properties (reference 4.10-1).